remove assimp pending fbx upgrade

84 files changed, 0 insertions, 23852 deletions

diff --git a/thirdparty/assimp/include/assimp/.editorconfig b/thirdparty/assimp/include/assimp/.editorconfig
deleted file mode 100644
index 9ea66423ad..0000000000
--- a/thirdparty/assimp/include/assimp/.editorconfig
+++ /dev/null
@@ -1,8 +0,0 @@
-# See <http://EditorConfig.org> for details
-
-[*.{h,hpp,inl}]
-end_of_line = lf
-insert_final_newline = true
-trim_trailing_whitespace = true
-indent_size = 4
-indent_style = space
diff --git a/thirdparty/assimp/include/assimp/BaseImporter.h b/thirdparty/assimp/include/assimp/BaseImporter.h
deleted file mode 100644
index ad8a3dafd8..0000000000
--- a/thirdparty/assimp/include/assimp/BaseImporter.h
+++ /dev/null
@@ -1,420 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Definition of the base class for all importer worker classes. */
-#pragma once
-#ifndef INCLUDED_AI_BASEIMPORTER_H
-#define INCLUDED_AI_BASEIMPORTER_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include "Exceptional.h"
-
-#include <vector>
-#include <set>
-#include <map>
-#include <assimp/types.h>
-#include <assimp/ProgressHandler.hpp>
-#include <assimp/ai_assert.h>
-
-struct aiScene;
-struct aiImporterDesc;
-
-namespace Assimp    {
-
-class Importer;
-class IOSystem;
-class BaseProcess;
-class SharedPostProcessInfo;
-class IOStream;
-
-// utility to do char4 to uint32 in a portable manner
-#define AI_MAKE_MAGIC(string) ((uint32_t)((string[0] << 24) + \
-    (string[1] << 16) + (string[2] << 8) + string[3]))
-
-
-// ---------------------------------------------------------------------------
-/** FOR IMPORTER PLUGINS ONLY: The BaseImporter defines a common interface
- *  for all importer worker classes.
- *
- * The interface defines two functions: CanRead() is used to check if the
- * importer can handle the format of the given file. If an implementation of
- * this function returns true, the importer then calls ReadFile() which
- * imports the given file. ReadFile is not overridable, it just calls
- * InternReadFile() and catches any ImportErrorException that might occur.
- */
-class ASSIMP_API BaseImporter {
-    friend class Importer;
-
-private:
-    /* Pushes state into importer for the importer scale */
-    virtual void UpdateImporterScale( Importer* pImp );
-
-public:
-
-    /** Constructor to be privately used by #Importer */
-    BaseImporter() AI_NO_EXCEPT;
-
-    /** Destructor, private as well */
-    virtual ~BaseImporter();
-
-    // -------------------------------------------------------------------
-    /** Returns whether the class can handle the format of the given file.
-     *
-     * The implementation should be as quick as possible. A check for
-     * the file extension is enough. If no suitable loader is found with
-     * this strategy, CanRead() is called again, the 'checkSig' parameter
-     * set to true this time. Now the implementation is expected to
-     * perform a full check of the file structure, possibly searching the
-     * first bytes of the file for magic identifiers or keywords.
-     *
-     * @param pFile Path and file name of the file to be examined.
-     * @param pIOHandler The IO handler to use for accessing any file.
-     * @param checkSig Set to true if this method is called a second time.
-     *   This time, the implementation may take more time to examine the
-     *   contents of the file to be loaded for magic bytes, keywords, etc
-     *   to be able to load files with unknown/not existent file extensions.
-     * @return true if the class can read this file, false if not.
-     */
-    virtual bool CanRead(
-        const std::string& pFile,
-        IOSystem* pIOHandler,
-        bool checkSig
-        ) const = 0;
-
-    // -------------------------------------------------------------------
-    /** Imports the given file and returns the imported data.
-     * If the import succeeds, ownership of the data is transferred to
-     * the caller. If the import fails, NULL is returned. The function
-     * takes care that any partially constructed data is destroyed
-     * beforehand.
-     *
-     * @param pImp #Importer object hosting this loader.
-     * @param pFile Path of the file to be imported.
-     * @param pIOHandler IO-Handler used to open this and possible other files.
-     * @return The imported data or NULL if failed. If it failed a
-     * human-readable error description can be retrieved by calling
-     * GetErrorText()
-     *
-     * @note This function is not intended to be overridden. Implement
-     * InternReadFile() to do the import. If an exception is thrown somewhere
-     * in InternReadFile(), this function will catch it and transform it into
-     *  a suitable response to the caller.
-     */
-    aiScene* ReadFile(
-        Importer* pImp,
-        const std::string& pFile,
-        IOSystem* pIOHandler
-        );
-
-    // -------------------------------------------------------------------
-    /** Returns the error description of the last error that occurred.
-     * @return A description of the last error that occurred. An empty
-     * string if there was no error.
-     */
-    const std::string& GetErrorText() const {
-        return m_ErrorText;
-    }
-
-    // -------------------------------------------------------------------
-    /** Called prior to ReadFile().
-     * The function is a request to the importer to update its configuration
-     * basing on the Importer's configuration property list.
-     * @param pImp Importer instance
-     */
-    virtual void SetupProperties(
-        const Importer* pImp
-        );
-
-    // -------------------------------------------------------------------
-    /** Called by #Importer::GetImporterInfo to get a description of
-     *  some loader features. Importers must provide this information. */
-    virtual const aiImporterDesc* GetInfo() const = 0;
-
-    /**
-     * Will be called only by scale process when scaling is requested.
-     */
-    virtual void SetFileScale(double scale)
-    {
-        fileScale = scale;
-    }
-
-    virtual double GetFileScale() const
-    {
-        return fileScale;
-    }
-
-    enum ImporterUnits {
-        M,
-        MM,
-        CM,
-        INCHES,
-        FEET
-    };
-
-    /**
-     * Assimp Importer
-     * unit conversions available 
-     * NOTE: Valid options are initialised in the
-     * constructor in the implementation file to
-     * work around a VS2013 compiler bug if support
-     * for that compiler is dropped in the future
-     * initialisation can be moved back here
-     * */
-    std::map<ImporterUnits, double> importerUnits;
-
-    virtual void SetApplicationUnits( const ImporterUnits& unit )
-    {
-        importerScale = importerUnits[unit];
-        applicationUnits = unit;
-    }
-
-    virtual const ImporterUnits& GetApplicationUnits()
-    {
-        return applicationUnits;
-    }
-
-    // -------------------------------------------------------------------
-    /** Called by #Importer::GetExtensionList for each loaded importer.
-     *  Take the extension list contained in the structure returned by
-     *  #GetInfo and insert all file extensions into the given set.
-     *  @param extension set to collect file extensions in*/
-    void GetExtensionList(std::set<std::string>& extensions);
-    
-protected:    
-    ImporterUnits applicationUnits = ImporterUnits::M;
-    double importerScale = 1.0;
-    double fileScale = 1.0;
-
-
-
-    // -------------------------------------------------------------------
-    /** Imports the given file into the given scene structure. The
-     * function is expected to throw an ImportErrorException if there is
-     * an error. If it terminates normally, the data in aiScene is
-     * expected to be correct. Override this function to implement the
-     * actual importing.
-     * <br>
-     *  The output scene must meet the following requirements:<br>
-     * <ul>
-     * <li>At least a root node must be there, even if its only purpose
-     *     is to reference one mesh.</li>
-     * <li>aiMesh::mPrimitiveTypes may be 0. The types of primitives
-     *   in the mesh are determined automatically in this case.</li>
-     * <li>the vertex data is stored in a pseudo-indexed "verbose" format.
-     *   In fact this means that every vertex that is referenced by
-     *   a face is unique. Or the other way round: a vertex index may
-     *   not occur twice in a single aiMesh.</li>
-     * <li>aiAnimation::mDuration may be -1. Assimp determines the length
-     *   of the animation automatically in this case as the length of
-     *   the longest animation channel.</li>
-     * <li>aiMesh::mBitangents may be NULL if tangents and normals are
-     *   given. In this case bitangents are computed as the cross product
-     *   between normal and tangent.</li>
-     * <li>There needn't be a material. If none is there a default material
-     *   is generated. However, it is recommended practice for loaders
-     *   to generate a default material for yourself that matches the
-     *   default material setting for the file format better than Assimp's
-     *   generic default material. Note that default materials *should*
-     *   be named AI_DEFAULT_MATERIAL_NAME if they're just color-shaded
-     *   or AI_DEFAULT_TEXTURED_MATERIAL_NAME if they define a (dummy)
-     *   texture. </li>
-     * </ul>
-     * If the AI_SCENE_FLAGS_INCOMPLETE-Flag is <b>not</b> set:<ul>
-     * <li> at least one mesh must be there</li>
-     * <li> there may be no meshes with 0 vertices or faces</li>
-     * </ul>
-     * This won't be checked (except by the validation step): Assimp will
-     * crash if one of the conditions is not met!
-     *
-     * @param pFile Path of the file to be imported.
-     * @param pScene The scene object to hold the imported data.
-     * NULL is not a valid parameter.
-     * @param pIOHandler The IO handler to use for any file access.
-     * NULL is not a valid parameter. */
-    virtual void InternReadFile(
-        const std::string& pFile,
-        aiScene* pScene,
-        IOSystem* pIOHandler
-        ) = 0;
-
-public: // static utilities
-
-    // -------------------------------------------------------------------
-    /** A utility for CanRead().
-     *
-     *  The function searches the header of a file for a specific token
-     *  and returns true if this token is found. This works for text
-     *  files only. There is a rudimentary handling of UNICODE files.
-     *  The comparison is case independent.
-     *
-     *  @param pIOSystem IO System to work with
-     *  @param file File name of the file
-     *  @param tokens List of tokens to search for
-     *  @param numTokens Size of the token array
-     *  @param searchBytes Number of bytes to be searched for the tokens.
-     */
-    static bool SearchFileHeaderForToken(
-        IOSystem* pIOSystem,
-        const std::string&  file,
-        const char** tokens,
-        unsigned int numTokens,
-        unsigned int searchBytes = 200,
-        bool tokensSol = false,
-        bool noAlphaBeforeTokens = false);
-
-    // -------------------------------------------------------------------
-    /** @brief Check whether a file has a specific file extension
-     *  @param pFile Input file
-     *  @param ext0 Extension to check for. Lowercase characters only, no dot!
-     *  @param ext1 Optional second extension
-     *  @param ext2 Optional third extension
-     *  @note Case-insensitive
-     */
-    static bool SimpleExtensionCheck (
-        const std::string& pFile,
-        const char* ext0,
-        const char* ext1 = NULL,
-        const char* ext2 = NULL);
-
-    // -------------------------------------------------------------------
-    /** @brief Extract file extension from a string
-     *  @param pFile Input file
-     *  @return Extension without trailing dot, all lowercase
-     */
-    static std::string GetExtension (
-        const std::string& pFile);
-
-    // -------------------------------------------------------------------
-    /** @brief Check whether a file starts with one or more magic tokens
-     *  @param pFile Input file
-     *  @param pIOHandler IO system to be used
-     *  @param magic n magic tokens
-     *  @params num Size of magic
-     *  @param offset Offset from file start where tokens are located
-     *  @param Size of one token, in bytes. Maximally 16 bytes.
-     *  @return true if one of the given tokens was found
-     *
-     *  @note For convenience, the check is also performed for the
-     *  byte-swapped variant of all tokens (big endian). Only for
-     *  tokens of size 2,4.
-     */
-    static bool CheckMagicToken(
-        IOSystem* pIOHandler,
-        const std::string& pFile,
-        const void* magic,
-        unsigned int num,
-        unsigned int offset = 0,
-        unsigned int size   = 4);
-
-    // -------------------------------------------------------------------
-    /** An utility for all text file loaders. It converts a file to our
-     *   UTF8 character set. Errors are reported, but ignored.
-     *
-     *  @param data File buffer to be converted to UTF8 data. The buffer
-     *  is resized as appropriate. */
-    static void ConvertToUTF8(
-        std::vector<char>& data);
-
-    // -------------------------------------------------------------------
-    /** An utility for all text file loaders. It converts a file from our
-     *   UTF8 character set back to ISO-8859-1. Errors are reported, but ignored.
-     *
-     *  @param data File buffer to be converted from UTF8 to ISO-8859-1. The buffer
-     *  is resized as appropriate. */
-    static void ConvertUTF8toISO8859_1(
-        std::string& data);
-
-    // -------------------------------------------------------------------
-    /// @brief  Enum to define, if empty files are ok or not.
-    enum TextFileMode { 
-        ALLOW_EMPTY,
-        FORBID_EMPTY 
-    };
-
-    // -------------------------------------------------------------------
-    /** Utility for text file loaders which copies the contents of the
-     *  file into a memory buffer and converts it to our UTF8
-     *  representation.
-     *  @param stream Stream to read from.
-     *  @param data Output buffer to be resized and filled with the
-     *   converted text file data. The buffer is terminated with
-     *   a binary 0.
-     *  @param mode Whether it is OK to load empty text files. */
-    static void TextFileToBuffer(
-        IOStream* stream,
-        std::vector<char>& data,
-        TextFileMode mode = FORBID_EMPTY);
-
-    // -------------------------------------------------------------------
-    /** Utility function to move a std::vector into a aiScene array
-    *  @param vec The vector to be moved
-    *  @param out The output pointer to the allocated array.
-    *  @param numOut The output count of elements copied. */
-    template<typename T>
-    AI_FORCE_INLINE
-    static void CopyVector(
-        std::vector<T>& vec,
-        T*& out,
-        unsigned int& outLength)
-    {
-        outLength = unsigned(vec.size());
-        if (outLength) {
-            out = new T[outLength];
-            std::swap_ranges(vec.begin(), vec.end(), out);
-        }
-    }
-
-protected:
-    /// Error description in case there was one.
-    std::string m_ErrorText;
-    /// Currently set progress handler.
-    ProgressHandler* m_progress;
-};
-
-
-
-} // end of namespace Assimp
-
-#endif // AI_BASEIMPORTER_H_INC
diff --git a/thirdparty/assimp/include/assimp/Bitmap.h b/thirdparty/assimp/include/assimp/Bitmap.h
deleted file mode 100644
index 4c3f5a437b..0000000000
--- a/thirdparty/assimp/include/assimp/Bitmap.h
+++ /dev/null
@@ -1,129 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file Bitmap.h
- *  @brief Defines bitmap format helper for textures
- *
- * Used for file formats which embed their textures into the model file.
- */
-#pragma once
-#ifndef AI_BITMAP_H_INC
-#define AI_BITMAP_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include "defs.h"
-#include <stdint.h>
-#include <cstddef>
-
-struct aiTexture;
-
-namespace Assimp {
-
-class IOStream;
-
-class ASSIMP_API Bitmap {
-protected:
-
-    struct Header {
-        uint16_t type;
-        uint32_t size;
-        uint16_t reserved1;
-        uint16_t reserved2;
-        uint32_t offset;
-
-        // We define the struct size because sizeof(Header) might return a wrong result because of structure padding.
-        // Moreover, we must use this ugly and error prone syntax because Visual Studio neither support constexpr or sizeof(name_of_field).
-        static const std::size_t header_size =
-            sizeof(uint16_t) + // type
-            sizeof(uint32_t) + // size
-            sizeof(uint16_t) + // reserved1
-            sizeof(uint16_t) + // reserved2
-            sizeof(uint32_t);  // offset
-    };
-
-    struct DIB {
-        uint32_t size;
-        int32_t width;
-        int32_t height;
-        uint16_t planes;
-        uint16_t bits_per_pixel;
-        uint32_t compression;
-        uint32_t image_size;
-        int32_t x_resolution;
-        int32_t y_resolution;
-        uint32_t nb_colors;
-        uint32_t nb_important_colors;
-
-        // We define the struct size because sizeof(DIB) might return a wrong result because of structure padding.
-        // Moreover, we must use this ugly and error prone syntax because Visual Studio neither support constexpr or sizeof(name_of_field).
-        static const std::size_t dib_size =
-            sizeof(uint32_t) + // size
-            sizeof(int32_t) +  // width
-            sizeof(int32_t) +  // height
-            sizeof(uint16_t) + // planes
-            sizeof(uint16_t) + // bits_per_pixel
-            sizeof(uint32_t) + // compression
-            sizeof(uint32_t) + // image_size
-            sizeof(int32_t) +  // x_resolution
-            sizeof(int32_t) +  // y_resolution
-            sizeof(uint32_t) + // nb_colors
-            sizeof(uint32_t);  // nb_important_colors
-    };
-
-    static const std::size_t mBytesPerPixel = 4;
-
-public:
-    static void Save(aiTexture* texture, IOStream* file);
-
-protected:
-    static void WriteHeader(Header& header, IOStream* file);
-    static void WriteDIB(DIB& dib, IOStream* file);
-    static void WriteData(aiTexture* texture, IOStream* file);
-};
-
-}
-
-#endif // AI_BITMAP_H_INC
diff --git a/thirdparty/assimp/include/assimp/BlobIOSystem.h b/thirdparty/assimp/include/assimp/BlobIOSystem.h
deleted file mode 100644
index d005e5c119..0000000000
--- a/thirdparty/assimp/include/assimp/BlobIOSystem.h
+++ /dev/null
@@ -1,338 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file Provides cheat implementations for IOSystem and IOStream to
- *  redirect exporter output to a blob chain.*/
-
-#ifndef AI_BLOBIOSYSTEM_H_INCLUDED
-#define AI_BLOBIOSYSTEM_H_INCLUDED
-
-#include <assimp/IOStream.hpp>
-#include <assimp/cexport.h>
-#include <assimp/IOSystem.hpp>
-#include <assimp/DefaultLogger.hpp>
-#include <stdint.h>
-#include <set>
-#include <vector>
-
-namespace Assimp    {
-    class BlobIOSystem;
-
-// --------------------------------------------------------------------------------------------
-/** Redirect IOStream to a blob */
-// --------------------------------------------------------------------------------------------
-class BlobIOStream : public IOStream
-{
-public:
-
-    BlobIOStream(BlobIOSystem* creator, const std::string& file, size_t initial = 4096)
-        : buffer()
-        , cur_size()
-        , file_size()
-        , cursor()
-        , initial(initial)
-        , file(file)
-        , creator(creator)
-    {
-    }
-
-
-    virtual ~BlobIOStream();
-
-public:
-
-    // -------------------------------------------------------------------
-    aiExportDataBlob* GetBlob()
-    {
-        aiExportDataBlob* blob = new aiExportDataBlob();
-        blob->size = file_size;
-        blob->data = buffer;
-
-        buffer = NULL;
-
-        return blob;
-    }
-
-
-public:
-
-
-    // -------------------------------------------------------------------
-    virtual size_t Read( void *,
-        size_t,
-        size_t )
-    {
-        return 0;
-    }
-
-    // -------------------------------------------------------------------
-    virtual size_t Write(const void* pvBuffer,
-        size_t pSize,
-        size_t pCount)
-    {
-        pSize *= pCount;
-        if (cursor + pSize > cur_size) {
-            Grow(cursor + pSize);
-        }
-
-        memcpy(buffer+cursor, pvBuffer, pSize);
-        cursor += pSize;
-
-        file_size = std::max(file_size,cursor);
-        return pCount;
-    }
-
-    // -------------------------------------------------------------------
-    virtual aiReturn Seek(size_t pOffset,
-        aiOrigin pOrigin)
-    {
-        switch(pOrigin)
-        {
-        case aiOrigin_CUR:
-            cursor += pOffset;
-            break;
-
-        case aiOrigin_END:
-            cursor = file_size - pOffset;
-            break;
-
-        case aiOrigin_SET:
-            cursor = pOffset;
-            break;
-
-        default:
-            return AI_FAILURE;
-        }
-
-        if (cursor > file_size) {
-            Grow(cursor);
-        }
-
-        file_size = std::max(cursor,file_size);
-        return AI_SUCCESS;
-    }
-
-    // -------------------------------------------------------------------
-    virtual size_t Tell() const
-    {
-        return cursor;
-    }
-
-    // -------------------------------------------------------------------
-    virtual size_t FileSize() const
-    {
-        return file_size;
-    }
-
-    // -------------------------------------------------------------------
-    virtual void Flush()
-    {
-        // ignore
-    }
-
-
-
-private:
-
-    // -------------------------------------------------------------------
-    void Grow(size_t need = 0)
-    {
-        // 1.5 and phi are very heap-friendly growth factors (the first
-        // allows for frequent re-use of heap blocks, the second
-        // forms a fibonacci sequence with similar characteristics -
-        // since this heavily depends on the heap implementation
-        // and other factors as well, i'll just go with 1.5 since
-        // it is quicker to compute).
-        size_t new_size = std::max(initial, std::max( need, cur_size+(cur_size>>1) ));
-
-        const uint8_t* const old = buffer;
-        buffer = new uint8_t[new_size];
-
-        if (old) {
-            memcpy(buffer,old,cur_size);
-            delete[] old;
-        }
-
-        cur_size = new_size;
-    }
-
-private:
-
-    uint8_t* buffer;
-    size_t cur_size,file_size, cursor, initial;
-
-    const std::string file;
-    BlobIOSystem* const creator;
-};
-
-
-#define AI_BLOBIO_MAGIC "$blobfile"
-
-// --------------------------------------------------------------------------------------------
-/** Redirect IOSystem to a blob */
-// --------------------------------------------------------------------------------------------
-class BlobIOSystem : public IOSystem
-{
-
-    friend class BlobIOStream;
-    typedef std::pair<std::string, aiExportDataBlob*> BlobEntry;
-
-public:
-
-    BlobIOSystem()
-    {
-    }
-
-    virtual ~BlobIOSystem()
-    {
-        for(BlobEntry& blobby : blobs) {
-            delete blobby.second;
-        }
-    }
-
-public:
-
-    // -------------------------------------------------------------------
-    const char* GetMagicFileName() const
-    {
-        return AI_BLOBIO_MAGIC;
-    }
-
-
-    // -------------------------------------------------------------------
-    aiExportDataBlob* GetBlobChain()
-    {
-        // one must be the master
-        aiExportDataBlob* master = NULL, *cur;
-        for(const BlobEntry& blobby : blobs) {
-            if (blobby.first == AI_BLOBIO_MAGIC) {
-                master = blobby.second;
-                break;
-            }
-        }
-        if (!master) {
-            ASSIMP_LOG_ERROR("BlobIOSystem: no data written or master file was not closed properly.");
-            return NULL;
-        }
-
-        master->name.Set("");
-
-        cur = master;
-        for(const BlobEntry& blobby : blobs) {
-            if (blobby.second == master) {
-                continue;
-            }
-
-            cur->next = blobby.second;
-            cur = cur->next;
-
-            // extract the file extension from the file written
-            const std::string::size_type s = blobby.first.find_first_of('.');
-            cur->name.Set(s == std::string::npos ? blobby.first : blobby.first.substr(s+1));
-        }
-
-        // give up blob ownership
-        blobs.clear();
-        return master;
-    }
-
-public:
-
-    // -------------------------------------------------------------------
-    virtual bool Exists( const char* pFile) const {
-        return created.find(std::string(pFile)) != created.end();
-    }
-
-
-    // -------------------------------------------------------------------
-    virtual char getOsSeparator() const {
-        return '/';
-    }
-
-
-    // -------------------------------------------------------------------
-    virtual IOStream* Open(const char* pFile,
-        const char* pMode)
-    {
-        if (pMode[0] != 'w') {
-            return NULL;
-        }
-
-        created.insert(std::string(pFile));
-        return new BlobIOStream(this,std::string(pFile));
-    }
-
-    // -------------------------------------------------------------------
-    virtual void Close( IOStream* pFile)
-    {
-        delete pFile;
-    }
-
-private:
-
-    // -------------------------------------------------------------------
-    void OnDestruct(const std::string& filename, BlobIOStream* child)
-    {
-        // we don't know in which the files are closed, so we
-        // can't reliably say that the first must be the master
-        // file ...
-        blobs.push_back( BlobEntry(filename,child->GetBlob()) );
-    }
-
-private:
-    std::set<std::string> created;
-    std::vector< BlobEntry > blobs;
-};
-
-
-// --------------------------------------------------------------------------------------------
-BlobIOStream :: ~BlobIOStream()
-{
-    creator->OnDestruct(file,this);
-    delete[] buffer;
-}
-
-
-} // end Assimp
-
-#endif
diff --git a/thirdparty/assimp/include/assimp/ByteSwapper.h b/thirdparty/assimp/include/assimp/ByteSwapper.h
deleted file mode 100644
index 3f14c471a8..0000000000
--- a/thirdparty/assimp/include/assimp/ByteSwapper.h
+++ /dev/null
@@ -1,292 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Helper class tp perform various byte oder swappings
-   (e.g. little to big endian) */
-#pragma once
-#ifndef AI_BYTESWAPPER_H_INC
-#define AI_BYTESWAPPER_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/ai_assert.h>
-#include <assimp/types.h>
-#include <stdint.h>
-
-#if _MSC_VER >= 1400
-#include <stdlib.h>
-#endif
-
-namespace Assimp    {
-// --------------------------------------------------------------------------------------
-/** Defines some useful byte order swap routines.
- *
- * This is required to read big-endian model formats on little-endian machines,
- * and vice versa. Direct use of this class is DEPRECATED. Use #StreamReader instead. */
-// --------------------------------------------------------------------------------------
-class ByteSwap {
-    ByteSwap() AI_NO_EXCEPT {}
-
-public:
-
-    // ----------------------------------------------------------------------
-    /** Swap two bytes of data
-     *  @param[inout] _szOut A void* to save the reintcasts for the caller. */
-    static inline void Swap2(void* _szOut)
-    {
-        ai_assert(_szOut);
-
-#if _MSC_VER >= 1400
-        uint16_t* const szOut = reinterpret_cast<uint16_t*>(_szOut);
-        *szOut = _byteswap_ushort(*szOut);
-#else
-        uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
-        std::swap(szOut[0],szOut[1]);
-#endif
-    }
-
-    // ----------------------------------------------------------------------
-    /** Swap four bytes of data
-     *  @param[inout] _szOut A void* to save the reintcasts for the caller. */
-    static inline void Swap4(void* _szOut)
-    {
-        ai_assert(_szOut);
-
-#if _MSC_VER >= 1400
-        uint32_t* const szOut = reinterpret_cast<uint32_t*>(_szOut);
-        *szOut = _byteswap_ulong(*szOut);
-#else
-        uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
-        std::swap(szOut[0],szOut[3]);
-        std::swap(szOut[1],szOut[2]);
-#endif
-    }
-
-    // ----------------------------------------------------------------------
-    /** Swap eight bytes of data
-     *  @param[inout] _szOut A void* to save the reintcasts for the caller. */
-    static inline void Swap8(void* _szOut)
-    {
-    ai_assert(_szOut);
-
-#if _MSC_VER >= 1400
-        uint64_t* const szOut = reinterpret_cast<uint64_t*>(_szOut);
-        *szOut = _byteswap_uint64(*szOut);
-#else
-        uint8_t* const szOut = reinterpret_cast<uint8_t*>(_szOut);
-        std::swap(szOut[0],szOut[7]);
-        std::swap(szOut[1],szOut[6]);
-        std::swap(szOut[2],szOut[5]);
-        std::swap(szOut[3],szOut[4]);
-#endif
-    }
-
-    // ----------------------------------------------------------------------
-    /** ByteSwap a float. Not a joke.
-     *  @param[inout] fOut ehm. .. */
-    static inline void Swap(float* fOut) {
-        Swap4(fOut);
-    }
-
-    // ----------------------------------------------------------------------
-    /** ByteSwap a double. Not a joke.
-     *  @param[inout] fOut ehm. .. */
-    static inline void Swap(double* fOut) {
-        Swap8(fOut);
-    }
-
-
-    // ----------------------------------------------------------------------
-    /** ByteSwap an int16t. Not a joke.
-     *  @param[inout] fOut ehm. .. */
-    static inline void Swap(int16_t* fOut) {
-        Swap2(fOut);
-    }
-
-    static inline void Swap(uint16_t* fOut) {
-        Swap2(fOut);
-    }
-
-    // ----------------------------------------------------------------------
-    /** ByteSwap an int32t. Not a joke.
-     *  @param[inout] fOut ehm. .. */
-    static inline void Swap(int32_t* fOut){
-        Swap4(fOut);
-    }
-
-    static inline void Swap(uint32_t* fOut){
-        Swap4(fOut);
-    }
-
-    // ----------------------------------------------------------------------
-    /** ByteSwap an int64t. Not a joke.
-     *  @param[inout] fOut ehm. .. */
-    static inline void Swap(int64_t* fOut) {
-        Swap8(fOut);
-    }
-
-    static inline void Swap(uint64_t* fOut) {
-        Swap8(fOut);
-    }
-
-    // ----------------------------------------------------------------------
-    //! Templatized ByteSwap
-    //! \returns param tOut as swapped
-    template<typename Type>
-    static inline Type Swapped(Type tOut)
-    {
-        return _swapper<Type,sizeof(Type)>()(tOut);
-    }
-
-private:
-
-    template <typename T, size_t size> struct _swapper;
-};
-
-template <typename T> struct ByteSwap::_swapper<T,2> {
-    T operator() (T tOut) {
-        Swap2(&tOut);
-        return tOut;
-    }
-};
-
-template <typename T> struct ByteSwap::_swapper<T,4> {
-    T operator() (T tOut) {
-        Swap4(&tOut);
-        return tOut;
-    }
-};
-
-template <typename T> struct ByteSwap::_swapper<T,8> {
-    T operator() (T tOut) {
-        Swap8(&tOut);
-        return tOut;
-    }
-};
-
-
-// --------------------------------------------------------------------------------------
-// ByteSwap macros for BigEndian/LittleEndian support
-// --------------------------------------------------------------------------------------
-#if (defined AI_BUILD_BIG_ENDIAN)
-#   define AI_LE(t) (t)
-#   define AI_BE(t) ByteSwap::Swapped(t)
-#   define AI_LSWAP2(p)
-#   define AI_LSWAP4(p)
-#   define AI_LSWAP8(p)
-#   define AI_LSWAP2P(p)
-#   define AI_LSWAP4P(p)
-#   define AI_LSWAP8P(p)
-#   define LE_NCONST const
-#   define AI_SWAP2(p) ByteSwap::Swap2(&(p))
-#   define AI_SWAP4(p) ByteSwap::Swap4(&(p))
-#   define AI_SWAP8(p) ByteSwap::Swap8(&(p))
-#   define AI_SWAP2P(p) ByteSwap::Swap2((p))
-#   define AI_SWAP4P(p) ByteSwap::Swap4((p))
-#   define AI_SWAP8P(p) ByteSwap::Swap8((p))
-#   define BE_NCONST
-#else
-#   define AI_BE(t) (t)
-#   define AI_LE(t) ByteSwap::Swapped(t)
-#   define AI_SWAP2(p)
-#   define AI_SWAP4(p)
-#   define AI_SWAP8(p)
-#   define AI_SWAP2P(p)
-#   define AI_SWAP4P(p)
-#   define AI_SWAP8P(p)
-#   define BE_NCONST const
-#   define AI_LSWAP2(p)     ByteSwap::Swap2(&(p))
-#   define AI_LSWAP4(p)     ByteSwap::Swap4(&(p))
-#   define AI_LSWAP8(p)     ByteSwap::Swap8(&(p))
-#   define AI_LSWAP2P(p)    ByteSwap::Swap2((p))
-#   define AI_LSWAP4P(p)    ByteSwap::Swap4((p))
-#   define AI_LSWAP8P(p)    ByteSwap::Swap8((p))
-#   define LE_NCONST
-#endif
-
-
-namespace Intern {
-
-// --------------------------------------------------------------------------------------------
-template <typename T, bool doit>
-struct ByteSwapper  {
-    void operator() (T* inout) {
-        ByteSwap::Swap(inout);
-    }
-};
-
-template <typename T>
-struct ByteSwapper<T,false> {
-    void operator() (T*) {
-    }
-};
-
-// --------------------------------------------------------------------------------------------
-template <bool SwapEndianess, typename T, bool RuntimeSwitch>
-struct Getter {
-    void operator() (T* inout, bool le) {
-#ifdef AI_BUILD_BIG_ENDIAN
-        le =  le;
-#else
-        le =  !le;
-#endif
-        if (le) {
-            ByteSwapper<T,(sizeof(T)>1?true:false)> () (inout);
-        }
-        else ByteSwapper<T,false> () (inout);
-    }
-};
-
-template <bool SwapEndianess, typename T>
-struct Getter<SwapEndianess,T,false> {
-
-    void operator() (T* inout, bool /*le*/) {
-        // static branch
-        ByteSwapper<T,(SwapEndianess && sizeof(T)>1)> () (inout);
-    }
-};
-} // end Intern
-} // end Assimp
-
-#endif //!! AI_BYTESWAPPER_H_INC
diff --git a/thirdparty/assimp/include/assimp/Compiler/poppack1.h b/thirdparty/assimp/include/assimp/Compiler/poppack1.h
deleted file mode 100644
index e033bc1472..0000000000
--- a/thirdparty/assimp/include/assimp/Compiler/poppack1.h
+++ /dev/null
@@ -1,22 +0,0 @@
-
-// ===============================================================================
-// May be included multiple times - resets structure packing to the defaults 
-// for all supported compilers. Reverts the changes made by #include <pushpack1.h> 
-//
-// Currently this works on the following compilers:
-// MSVC 7,8,9
-// GCC
-// BORLAND (complains about 'pack state changed but not reverted', but works)
-// ===============================================================================
-
-#ifndef AI_PUSHPACK_IS_DEFINED
-#	error pushpack1.h must be included after poppack1.h
-#endif
-
-// reset packing to the original value
-#if defined(_MSC_VER) ||  defined(__BORLANDC__) || defined (__BCPLUSPLUS__)
-#	pragma pack( pop )
-#endif
-#undef PACK_STRUCT
-
-#undef AI_PUSHPACK_IS_DEFINED
diff --git a/thirdparty/assimp/include/assimp/Compiler/pstdint.h b/thirdparty/assimp/include/assimp/Compiler/pstdint.h
deleted file mode 100644
index 4de4ce2a90..0000000000
--- a/thirdparty/assimp/include/assimp/Compiler/pstdint.h
+++ /dev/null
@@ -1,912 +0,0 @@
-/*  A portable stdint.h
- ****************************************************************************
- *  BSD License:
- ****************************************************************************
- *
- *  Copyright (c) 2005-2016 Paul Hsieh
- *  All rights reserved.
- *
- *  Redistribution and use in source and binary forms, with or without
- *  modification, are permitted provided that the following conditions
- *  are met:
- *
- *  1. Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *  2. Redistributions in binary form must reproduce the above copyright
- *     notice, this list of conditions and the following disclaimer in the
- *     documentation and/or other materials provided with the distribution.
- *  3. The name of the author may not be used to endorse or promote products
- *     derived from this software without specific prior written permission.
- *
- *  THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
- *  IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- *  OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
- *  NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
- *  THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- ****************************************************************************
- *
- *  Version 0.1.15.4
- *
- *  The ANSI C standard committee, for the C99 standard, specified the
- *  inclusion of a new standard include file called stdint.h.  This is
- *  a very useful and long desired include file which contains several
- *  very precise definitions for integer scalar types that is
- *  critically important for making portable several classes of
- *  applications including cryptography, hashing, variable length
- *  integer libraries and so on.  But for most developers its likely
- *  useful just for programming sanity.
- *
- *  The problem is that some compiler vendors chose to ignore the C99
- *  standard and some older compilers have no opportunity to be updated.
- *  Because of this situation, simply including stdint.h in your code
- *  makes it unportable.
- *
- *  So that's what this file is all about.  Its an attempt to build a
- *  single universal include file that works on as many platforms as
- *  possible to deliver what stdint.h is supposed to.  Even compilers
- *  that already come with stdint.h can use this file instead without
- *  any loss of functionality.  A few things that should be noted about
- *  this file:
- *
- *    1) It is not guaranteed to be portable and/or present an identical
- *       interface on all platforms.  The extreme variability of the
- *       ANSI C standard makes this an impossibility right from the
- *       very get go. Its really only meant to be useful for the vast
- *       majority of platforms that possess the capability of
- *       implementing usefully and precisely defined, standard sized
- *       integer scalars.  Systems which are not intrinsically 2s
- *       complement may produce invalid constants.
- *
- *    2) There is an unavoidable use of non-reserved symbols.
- *
- *    3) Other standard include files are invoked.
- *
- *    4) This file may come in conflict with future platforms that do
- *       include stdint.h.  The hope is that one or the other can be
- *       used with no real difference.
- *
- *    5) In the current version, if your platform can't represent
- *       int32_t, int16_t and int8_t, it just dumps out with a compiler
- *       error.
- *
- *    6) 64 bit integers may or may not be defined.  Test for their
- *       presence with the test: #ifdef INT64_MAX or #ifdef UINT64_MAX.
- *       Note that this is different from the C99 specification which
- *       requires the existence of 64 bit support in the compiler.  If
- *       this is not defined for your platform, yet it is capable of
- *       dealing with 64 bits then it is because this file has not yet
- *       been extended to cover all of your system's capabilities.
- *
- *    7) (u)intptr_t may or may not be defined.  Test for its presence
- *       with the test: #ifdef PTRDIFF_MAX.  If this is not defined
- *       for your platform, then it is because this file has not yet
- *       been extended to cover all of your system's capabilities, not
- *       because its optional.
- *
- *    8) The following might not been defined even if your platform is
- *       capable of defining it:
- *
- *       WCHAR_MIN
- *       WCHAR_MAX
- *       (u)int64_t
- *       PTRDIFF_MIN
- *       PTRDIFF_MAX
- *       (u)intptr_t
- *
- *    9) The following have not been defined:
- *
- *       WINT_MIN
- *       WINT_MAX
- *
- *   10) The criteria for defining (u)int_least(*)_t isn't clear,
- *       except for systems which don't have a type that precisely
- *       defined 8, 16, or 32 bit types (which this include file does
- *       not support anyways). Default definitions have been given.
- *
- *   11) The criteria for defining (u)int_fast(*)_t isn't something I
- *       would trust to any particular compiler vendor or the ANSI C
- *       committee.  It is well known that "compatible systems" are
- *       commonly created that have very different performance
- *       characteristics from the systems they are compatible with,
- *       especially those whose vendors make both the compiler and the
- *       system.  Default definitions have been given, but its strongly
- *       recommended that users never use these definitions for any
- *       reason (they do *NOT* deliver any serious guarantee of
- *       improved performance -- not in this file, nor any vendor's
- *       stdint.h).
- *
- *   12) The following macros:
- *
- *       PRINTF_INTMAX_MODIFIER
- *       PRINTF_INT64_MODIFIER
- *       PRINTF_INT32_MODIFIER
- *       PRINTF_INT16_MODIFIER
- *       PRINTF_LEAST64_MODIFIER
- *       PRINTF_LEAST32_MODIFIER
- *       PRINTF_LEAST16_MODIFIER
- *       PRINTF_INTPTR_MODIFIER
- *
- *       are strings which have been defined as the modifiers required
- *       for the "d", "u" and "x" printf formats to correctly output
- *       (u)intmax_t, (u)int64_t, (u)int32_t, (u)int16_t, (u)least64_t,
- *       (u)least32_t, (u)least16_t and (u)intptr_t types respectively.
- *       PRINTF_INTPTR_MODIFIER is not defined for some systems which
- *       provide their own stdint.h.  PRINTF_INT64_MODIFIER is not
- *       defined if INT64_MAX is not defined.  These are an extension
- *       beyond what C99 specifies must be in stdint.h.
- *
- *       In addition, the following macros are defined:
- *
- *       PRINTF_INTMAX_HEX_WIDTH
- *       PRINTF_INT64_HEX_WIDTH
- *       PRINTF_INT32_HEX_WIDTH
- *       PRINTF_INT16_HEX_WIDTH
- *       PRINTF_INT8_HEX_WIDTH
- *       PRINTF_INTMAX_DEC_WIDTH
- *       PRINTF_INT64_DEC_WIDTH
- *       PRINTF_INT32_DEC_WIDTH
- *       PRINTF_INT16_DEC_WIDTH
- *       PRINTF_UINT8_DEC_WIDTH
- *       PRINTF_UINTMAX_DEC_WIDTH
- *       PRINTF_UINT64_DEC_WIDTH
- *       PRINTF_UINT32_DEC_WIDTH
- *       PRINTF_UINT16_DEC_WIDTH
- *       PRINTF_UINT8_DEC_WIDTH
- *
- *       Which specifies the maximum number of characters required to
- *       print the number of that type in either hexadecimal or decimal.
- *       These are an extension beyond what C99 specifies must be in
- *       stdint.h.
- *
- *  Compilers tested (all with 0 warnings at their highest respective
- *  settings): Borland Turbo C 2.0, WATCOM C/C++ 11.0 (16 bits and 32
- *  bits), Microsoft Visual C++ 6.0 (32 bit), Microsoft Visual Studio
- *  .net (VC7), Intel C++ 4.0, GNU gcc v3.3.3
- *
- *  This file should be considered a work in progress.  Suggestions for
- *  improvements, especially those which increase coverage are strongly
- *  encouraged.
- *
- *  Acknowledgements
- *
- *  The following people have made significant contributions to the
- *  development and testing of this file:
- *
- *  Chris Howie
- *  John Steele Scott
- *  Dave Thorup
- *  John Dill
- *  Florian Wobbe
- *  Christopher Sean Morrison
- *  Mikkel Fahnoe Jorgensen
- *
- */
-
-#include <stddef.h>
-#include <limits.h>
-#include <signal.h>
-
-/*
- *  For gcc with _STDINT_H, fill in the PRINTF_INT*_MODIFIER macros, and
- *  do nothing else.  On the Mac OS X version of gcc this is _STDINT_H_.
- */
-
-#if ((defined(__SUNPRO_C) && __SUNPRO_C >= 0x570) || (defined(_MSC_VER) && _MSC_VER >= 1600) || (defined(__STDC__) && __STDC__ && defined(__STDC_VERSION__) && __STDC_VERSION__ >= 199901L) || (defined (__WATCOMC__) && (defined (_STDINT_H_INCLUDED) || __WATCOMC__ >= 1250)) || (defined(__GNUC__) && (__GNUC__ > 3 || defined(_STDINT_H) || defined(_STDINT_H_) || defined (__UINT_FAST64_TYPE__)) )) && !defined (_PSTDINT_H_INCLUDED)
-#include <stdint.h>
-#define _PSTDINT_H_INCLUDED
-# if defined(__GNUC__) && (defined(__x86_64__) || defined(__ppc64__)) && !(defined(__APPLE__) && defined(__MACH__))
-#  ifndef PRINTF_INT64_MODIFIER
-#   define PRINTF_INT64_MODIFIER "l"
-#  endif
-#  ifndef PRINTF_INT32_MODIFIER
-#   define PRINTF_INT32_MODIFIER ""
-#  endif
-# else
-#  ifndef PRINTF_INT64_MODIFIER
-#   define PRINTF_INT64_MODIFIER "ll"
-#  endif
-#  ifndef PRINTF_INT32_MODIFIER
-#   if (UINT_MAX == UINT32_MAX)
-#    define PRINTF_INT32_MODIFIER ""
-#   else
-#    define PRINTF_INT32_MODIFIER "l"
-#   endif
-#  endif
-# endif
-# ifndef PRINTF_INT16_MODIFIER
-#  define PRINTF_INT16_MODIFIER "h"
-# endif
-# ifndef PRINTF_INTMAX_MODIFIER
-#  define PRINTF_INTMAX_MODIFIER PRINTF_INT64_MODIFIER
-# endif
-# ifndef PRINTF_INT64_HEX_WIDTH
-#  define PRINTF_INT64_HEX_WIDTH "16"
-# endif
-# ifndef PRINTF_UINT64_HEX_WIDTH
-#  define PRINTF_UINT64_HEX_WIDTH "16"
-# endif
-# ifndef PRINTF_INT32_HEX_WIDTH
-#  define PRINTF_INT32_HEX_WIDTH "8"
-# endif
-# ifndef PRINTF_UINT32_HEX_WIDTH
-#  define PRINTF_UINT32_HEX_WIDTH "8"
-# endif
-# ifndef PRINTF_INT16_HEX_WIDTH
-#  define PRINTF_INT16_HEX_WIDTH "4"
-# endif
-# ifndef PRINTF_UINT16_HEX_WIDTH
-#  define PRINTF_UINT16_HEX_WIDTH "4"
-# endif
-# ifndef PRINTF_INT8_HEX_WIDTH
-#  define PRINTF_INT8_HEX_WIDTH "2"
-# endif
-# ifndef PRINTF_UINT8_HEX_WIDTH
-#  define PRINTF_UINT8_HEX_WIDTH "2"
-# endif
-# ifndef PRINTF_INT64_DEC_WIDTH
-#  define PRINTF_INT64_DEC_WIDTH "19"
-# endif
-# ifndef PRINTF_UINT64_DEC_WIDTH
-#  define PRINTF_UINT64_DEC_WIDTH "20"
-# endif
-# ifndef PRINTF_INT32_DEC_WIDTH
-#  define PRINTF_INT32_DEC_WIDTH "10"
-# endif
-# ifndef PRINTF_UINT32_DEC_WIDTH
-#  define PRINTF_UINT32_DEC_WIDTH "10"
-# endif
-# ifndef PRINTF_INT16_DEC_WIDTH
-#  define PRINTF_INT16_DEC_WIDTH "5"
-# endif
-# ifndef PRINTF_UINT16_DEC_WIDTH
-#  define PRINTF_UINT16_DEC_WIDTH "5"
-# endif
-# ifndef PRINTF_INT8_DEC_WIDTH
-#  define PRINTF_INT8_DEC_WIDTH "3"
-# endif
-# ifndef PRINTF_UINT8_DEC_WIDTH
-#  define PRINTF_UINT8_DEC_WIDTH "3"
-# endif
-# ifndef PRINTF_INTMAX_HEX_WIDTH
-#  define PRINTF_INTMAX_HEX_WIDTH PRINTF_UINT64_HEX_WIDTH
-# endif
-# ifndef PRINTF_UINTMAX_HEX_WIDTH
-#  define PRINTF_UINTMAX_HEX_WIDTH PRINTF_UINT64_HEX_WIDTH
-# endif
-# ifndef PRINTF_INTMAX_DEC_WIDTH
-#  define PRINTF_INTMAX_DEC_WIDTH PRINTF_UINT64_DEC_WIDTH
-# endif
-# ifndef PRINTF_UINTMAX_DEC_WIDTH
-#  define PRINTF_UINTMAX_DEC_WIDTH PRINTF_UINT64_DEC_WIDTH
-# endif
-
-/*
- *  Something really weird is going on with Open Watcom.  Just pull some of
- *  these duplicated definitions from Open Watcom's stdint.h file for now.
- */
-
-# if defined (__WATCOMC__) && __WATCOMC__ >= 1250
-#  if !defined (INT64_C)
-#   define INT64_C(x)   (x + (INT64_MAX - INT64_MAX))
-#  endif
-#  if !defined (UINT64_C)
-#   define UINT64_C(x)  (x + (UINT64_MAX - UINT64_MAX))
-#  endif
-#  if !defined (INT32_C)
-#   define INT32_C(x)   (x + (INT32_MAX - INT32_MAX))
-#  endif
-#  if !defined (UINT32_C)
-#   define UINT32_C(x)  (x + (UINT32_MAX - UINT32_MAX))
-#  endif
-#  if !defined (INT16_C)
-#   define INT16_C(x)   (x)
-#  endif
-#  if !defined (UINT16_C)
-#   define UINT16_C(x)  (x)
-#  endif
-#  if !defined (INT8_C)
-#   define INT8_C(x)   (x)
-#  endif
-#  if !defined (UINT8_C)
-#   define UINT8_C(x)  (x)
-#  endif
-#  if !defined (UINT64_MAX)
-#   define UINT64_MAX  18446744073709551615ULL
-#  endif
-#  if !defined (INT64_MAX)
-#   define INT64_MAX  9223372036854775807LL
-#  endif
-#  if !defined (UINT32_MAX)
-#   define UINT32_MAX  4294967295UL
-#  endif
-#  if !defined (INT32_MAX)
-#   define INT32_MAX  2147483647L
-#  endif
-#  if !defined (INTMAX_MAX)
-#   define INTMAX_MAX INT64_MAX
-#  endif
-#  if !defined (INTMAX_MIN)
-#   define INTMAX_MIN INT64_MIN
-#  endif
-# endif
-#endif
-
-/*
- *  I have no idea what is the truly correct thing to do on older Solaris.
- *  From some online discussions, this seems to be what is being
- *  recommended.  For people who actually are developing on older Solaris,
- *  what I would like to know is, does this define all of the relevant
- *  macros of a complete stdint.h?  Remember, in pstdint.h 64 bit is
- *  considered optional.
- */
-
-#if (defined(__SUNPRO_C) && __SUNPRO_C >= 0x420) && !defined(_PSTDINT_H_INCLUDED)
-#include <sys/inttypes.h>
-#define _PSTDINT_H_INCLUDED
-#endif
-
-#ifndef _PSTDINT_H_INCLUDED
-#define _PSTDINT_H_INCLUDED
-
-#ifndef SIZE_MAX
-# define SIZE_MAX (~(size_t)0)
-#endif
-
-/*
- *  Deduce the type assignments from limits.h under the assumption that
- *  integer sizes in bits are powers of 2, and follow the ANSI
- *  definitions.
- */
-
-#ifndef UINT8_MAX
-# define UINT8_MAX 0xff
-#endif
-#if !defined(uint8_t) && !defined(_UINT8_T) && !defined(vxWorks)
-# if (UCHAR_MAX == UINT8_MAX) || defined (S_SPLINT_S)
-    typedef unsigned char uint8_t;
-#   define UINT8_C(v) ((uint8_t) v)
-# else
-#   error "Platform not supported"
-# endif
-#endif
-
-#ifndef INT8_MAX
-# define INT8_MAX 0x7f
-#endif
-#ifndef INT8_MIN
-# define INT8_MIN INT8_C(0x80)
-#endif
-#if !defined(int8_t) && !defined(_INT8_T) && !defined(vxWorks)
-# if (SCHAR_MAX == INT8_MAX) || defined (S_SPLINT_S)
-    typedef signed char int8_t;
-#   define INT8_C(v) ((int8_t) v)
-# else
-#   error "Platform not supported"
-# endif
-#endif
-
-#ifndef UINT16_MAX
-# define UINT16_MAX 0xffff
-#endif
-#if !defined(uint16_t) && !defined(_UINT16_T) && !defined(vxWorks)
-#if (UINT_MAX == UINT16_MAX) || defined (S_SPLINT_S)
-  typedef unsigned int uint16_t;
-# ifndef PRINTF_INT16_MODIFIER
-#  define PRINTF_INT16_MODIFIER ""
-# endif
-# define UINT16_C(v) ((uint16_t) (v))
-#elif (USHRT_MAX == UINT16_MAX)
-  typedef unsigned short uint16_t;
-# define UINT16_C(v) ((uint16_t) (v))
-# ifndef PRINTF_INT16_MODIFIER
-#  define PRINTF_INT16_MODIFIER "h"
-# endif
-#else
-#error "Platform not supported"
-#endif
-#endif
-
-#ifndef INT16_MAX
-# define INT16_MAX 0x7fff
-#endif
-#ifndef INT16_MIN
-# define INT16_MIN INT16_C(0x8000)
-#endif
-#if !defined(int16_t) && !defined(_INT16_T) && !defined(vxWorks)
-#if (INT_MAX == INT16_MAX) || defined (S_SPLINT_S)
-  typedef signed int int16_t;
-# define INT16_C(v) ((int16_t) (v))
-# ifndef PRINTF_INT16_MODIFIER
-#  define PRINTF_INT16_MODIFIER ""
-# endif
-#elif (SHRT_MAX == INT16_MAX)
-  typedef signed short int16_t;
-# define INT16_C(v) ((int16_t) (v))
-# ifndef PRINTF_INT16_MODIFIER
-#  define PRINTF_INT16_MODIFIER "h"
-# endif
-#else
-#error "Platform not supported"
-#endif
-#endif
-
-#ifndef UINT32_MAX
-# define UINT32_MAX (0xffffffffUL)
-#endif
-#if !defined(uint32_t) && !defined(_UINT32_T) && !defined(vxWorks)
-#if (ULONG_MAX == UINT32_MAX) || defined (S_SPLINT_S)
-  typedef unsigned long uint32_t;
-# define UINT32_C(v) v ## UL
-# ifndef PRINTF_INT32_MODIFIER
-#  define PRINTF_INT32_MODIFIER "l"
-# endif
-#elif (UINT_MAX == UINT32_MAX)
-  typedef unsigned int uint32_t;
-# ifndef PRINTF_INT32_MODIFIER
-#  define PRINTF_INT32_MODIFIER ""
-# endif
-# define UINT32_C(v) v ## U
-#elif (USHRT_MAX == UINT32_MAX)
-  typedef unsigned short uint32_t;
-# define UINT32_C(v) ((unsigned short) (v))
-# ifndef PRINTF_INT32_MODIFIER
-#  define PRINTF_INT32_MODIFIER ""
-# endif
-#else
-#error "Platform not supported"
-#endif
-#endif
-
-#ifndef INT32_MAX
-# define INT32_MAX (0x7fffffffL)
-#endif
-#ifndef INT32_MIN
-# define INT32_MIN INT32_C(0x80000000)
-#endif
-#if !defined(int32_t) && !defined(_INT32_T) && !defined(vxWorks)
-#if (LONG_MAX == INT32_MAX) || defined (S_SPLINT_S)
-  typedef signed long int32_t;
-# define INT32_C(v) v ## L
-# ifndef PRINTF_INT32_MODIFIER
-#  define PRINTF_INT32_MODIFIER "l"
-# endif
-#elif (INT_MAX == INT32_MAX)
-  typedef signed int int32_t;
-# define INT32_C(v) v
-# ifndef PRINTF_INT32_MODIFIER
-#  define PRINTF_INT32_MODIFIER ""
-# endif
-#elif (SHRT_MAX == INT32_MAX)
-  typedef signed short int32_t;
-# define INT32_C(v) ((short) (v))
-# ifndef PRINTF_INT32_MODIFIER
-#  define PRINTF_INT32_MODIFIER ""
-# endif
-#else
-#error "Platform not supported"
-#endif
-#endif
-
-/*
- *  The macro stdint_int64_defined is temporarily used to record
- *  whether or not 64 integer support is available.  It must be
- *  defined for any 64 integer extensions for new platforms that are
- *  added.
- */
-
-#undef stdint_int64_defined
-#if (defined(__STDC__) && defined(__STDC_VERSION__)) || defined (S_SPLINT_S)
-# if (__STDC__ && __STDC_VERSION__ >= 199901L) || defined (S_SPLINT_S)
-#  define stdint_int64_defined
-   typedef long long int64_t;
-   typedef unsigned long long uint64_t;
-#  define UINT64_C(v) v ## ULL
-#  define  INT64_C(v) v ## LL
-#  ifndef PRINTF_INT64_MODIFIER
-#   define PRINTF_INT64_MODIFIER "ll"
-#  endif
-# endif
-#endif
-
-#if !defined (stdint_int64_defined)
-# if defined(__GNUC__) && !defined(vxWorks)
-#  define stdint_int64_defined
-   __extension__ typedef long long int64_t;
-   __extension__ typedef unsigned long long uint64_t;
-#  define UINT64_C(v) v ## ULL
-#  define  INT64_C(v) v ## LL
-#  ifndef PRINTF_INT64_MODIFIER
-#   define PRINTF_INT64_MODIFIER "ll"
-#  endif
-# elif defined(__MWERKS__) || defined (__SUNPRO_C) || defined (__SUNPRO_CC) || defined (__APPLE_CC__) || defined (_LONG_LONG) || defined (_CRAYC) || defined (S_SPLINT_S)
-#  define stdint_int64_defined
-   typedef long long int64_t;
-   typedef unsigned long long uint64_t;
-#  define UINT64_C(v) v ## ULL
-#  define  INT64_C(v) v ## LL
-#  ifndef PRINTF_INT64_MODIFIER
-#   define PRINTF_INT64_MODIFIER "ll"
-#  endif
-# elif (defined(__WATCOMC__) && defined(__WATCOM_INT64__)) || (defined(_MSC_VER) && _INTEGRAL_MAX_BITS >= 64) || (defined (__BORLANDC__) && __BORLANDC__ > 0x460) || defined (__alpha) || defined (__DECC)
-#  define stdint_int64_defined
-   typedef __int64 int64_t;
-   typedef unsigned __int64 uint64_t;
-#  define UINT64_C(v) v ## UI64
-#  define  INT64_C(v) v ## I64
-#  ifndef PRINTF_INT64_MODIFIER
-#   define PRINTF_INT64_MODIFIER "I64"
-#  endif
-# endif
-#endif
-
-#if !defined (LONG_LONG_MAX) && defined (INT64_C)
-# define LONG_LONG_MAX INT64_C (9223372036854775807)
-#endif
-#ifndef ULONG_LONG_MAX
-# define ULONG_LONG_MAX UINT64_C (18446744073709551615)
-#endif
-
-#if !defined (INT64_MAX) && defined (INT64_C)
-# define INT64_MAX INT64_C (9223372036854775807)
-#endif
-#if !defined (INT64_MIN) && defined (INT64_C)
-# define INT64_MIN INT64_C (-9223372036854775808)
-#endif
-#if !defined (UINT64_MAX) && defined (INT64_C)
-# define UINT64_MAX UINT64_C (18446744073709551615)
-#endif
-
-/*
- *  Width of hexadecimal for number field.
- */
-
-#ifndef PRINTF_INT64_HEX_WIDTH
-# define PRINTF_INT64_HEX_WIDTH "16"
-#endif
-#ifndef PRINTF_INT32_HEX_WIDTH
-# define PRINTF_INT32_HEX_WIDTH "8"
-#endif
-#ifndef PRINTF_INT16_HEX_WIDTH
-# define PRINTF_INT16_HEX_WIDTH "4"
-#endif
-#ifndef PRINTF_INT8_HEX_WIDTH
-# define PRINTF_INT8_HEX_WIDTH "2"
-#endif
-#ifndef PRINTF_INT64_DEC_WIDTH
-# define PRINTF_INT64_DEC_WIDTH "19"
-#endif
-#ifndef PRINTF_INT32_DEC_WIDTH
-# define PRINTF_INT32_DEC_WIDTH "10"
-#endif
-#ifndef PRINTF_INT16_DEC_WIDTH
-# define PRINTF_INT16_DEC_WIDTH "5"
-#endif
-#ifndef PRINTF_INT8_DEC_WIDTH
-# define PRINTF_INT8_DEC_WIDTH "3"
-#endif
-#ifndef PRINTF_UINT64_DEC_WIDTH
-# define PRINTF_UINT64_DEC_WIDTH "20"
-#endif
-#ifndef PRINTF_UINT32_DEC_WIDTH
-# define PRINTF_UINT32_DEC_WIDTH "10"
-#endif
-#ifndef PRINTF_UINT16_DEC_WIDTH
-# define PRINTF_UINT16_DEC_WIDTH "5"
-#endif
-#ifndef PRINTF_UINT8_DEC_WIDTH
-# define PRINTF_UINT8_DEC_WIDTH "3"
-#endif
-
-/*
- *  Ok, lets not worry about 128 bit integers for now.  Moore's law says
- *  we don't need to worry about that until about 2040 at which point
- *  we'll have bigger things to worry about.
- */
-
-#ifdef stdint_int64_defined
-  typedef int64_t intmax_t;
-  typedef uint64_t uintmax_t;
-# define  INTMAX_MAX   INT64_MAX
-# define  INTMAX_MIN   INT64_MIN
-# define UINTMAX_MAX  UINT64_MAX
-# define UINTMAX_C(v) UINT64_C(v)
-# define  INTMAX_C(v)  INT64_C(v)
-# ifndef PRINTF_INTMAX_MODIFIER
-#   define PRINTF_INTMAX_MODIFIER PRINTF_INT64_MODIFIER
-# endif
-# ifndef PRINTF_INTMAX_HEX_WIDTH
-#  define PRINTF_INTMAX_HEX_WIDTH PRINTF_INT64_HEX_WIDTH
-# endif
-# ifndef PRINTF_INTMAX_DEC_WIDTH
-#  define PRINTF_INTMAX_DEC_WIDTH PRINTF_INT64_DEC_WIDTH
-# endif
-#else
-  typedef int32_t intmax_t;
-  typedef uint32_t uintmax_t;
-# define  INTMAX_MAX   INT32_MAX
-# define UINTMAX_MAX  UINT32_MAX
-# define UINTMAX_C(v) UINT32_C(v)
-# define  INTMAX_C(v)  INT32_C(v)
-# ifndef PRINTF_INTMAX_MODIFIER
-#   define PRINTF_INTMAX_MODIFIER PRINTF_INT32_MODIFIER
-# endif
-# ifndef PRINTF_INTMAX_HEX_WIDTH
-#  define PRINTF_INTMAX_HEX_WIDTH PRINTF_INT32_HEX_WIDTH
-# endif
-# ifndef PRINTF_INTMAX_DEC_WIDTH
-#  define PRINTF_INTMAX_DEC_WIDTH PRINTF_INT32_DEC_WIDTH
-# endif
-#endif
-
-/*
- *  Because this file currently only supports platforms which have
- *  precise powers of 2 as bit sizes for the default integers, the
- *  least definitions are all trivial.  Its possible that a future
- *  version of this file could have different definitions.
- */
-
-#ifndef stdint_least_defined
-  typedef   int8_t   int_least8_t;
-  typedef  uint8_t  uint_least8_t;
-  typedef  int16_t  int_least16_t;
-  typedef uint16_t uint_least16_t;
-  typedef  int32_t  int_least32_t;
-  typedef uint32_t uint_least32_t;
-# define PRINTF_LEAST32_MODIFIER PRINTF_INT32_MODIFIER
-# define PRINTF_LEAST16_MODIFIER PRINTF_INT16_MODIFIER
-# define  UINT_LEAST8_MAX  UINT8_MAX
-# define   INT_LEAST8_MAX   INT8_MAX
-# define UINT_LEAST16_MAX UINT16_MAX
-# define  INT_LEAST16_MAX  INT16_MAX
-# define UINT_LEAST32_MAX UINT32_MAX
-# define  INT_LEAST32_MAX  INT32_MAX
-# define   INT_LEAST8_MIN   INT8_MIN
-# define  INT_LEAST16_MIN  INT16_MIN
-# define  INT_LEAST32_MIN  INT32_MIN
-# ifdef stdint_int64_defined
-    typedef  int64_t  int_least64_t;
-    typedef uint64_t uint_least64_t;
-#   define PRINTF_LEAST64_MODIFIER PRINTF_INT64_MODIFIER
-#   define UINT_LEAST64_MAX UINT64_MAX
-#   define  INT_LEAST64_MAX  INT64_MAX
-#   define  INT_LEAST64_MIN  INT64_MIN
-# endif
-#endif
-#undef stdint_least_defined
-
-/*
- *  The ANSI C committee pretending to know or specify anything about
- *  performance is the epitome of misguided arrogance.  The mandate of
- *  this file is to *ONLY* ever support that absolute minimum
- *  definition of the fast integer types, for compatibility purposes.
- *  No extensions, and no attempt to suggest what may or may not be a
- *  faster integer type will ever be made in this file.  Developers are
- *  warned to stay away from these types when using this or any other
- *  stdint.h.
- */
-
-typedef   int_least8_t   int_fast8_t;
-typedef  uint_least8_t  uint_fast8_t;
-typedef  int_least16_t  int_fast16_t;
-typedef uint_least16_t uint_fast16_t;
-typedef  int_least32_t  int_fast32_t;
-typedef uint_least32_t uint_fast32_t;
-#define  UINT_FAST8_MAX  UINT_LEAST8_MAX
-#define   INT_FAST8_MAX   INT_LEAST8_MAX
-#define UINT_FAST16_MAX UINT_LEAST16_MAX
-#define  INT_FAST16_MAX  INT_LEAST16_MAX
-#define UINT_FAST32_MAX UINT_LEAST32_MAX
-#define  INT_FAST32_MAX  INT_LEAST32_MAX
-#define   INT_FAST8_MIN   INT_LEAST8_MIN
-#define  INT_FAST16_MIN  INT_LEAST16_MIN
-#define  INT_FAST32_MIN  INT_LEAST32_MIN
-#ifdef stdint_int64_defined
-  typedef  int_least64_t  int_fast64_t;
-  typedef uint_least64_t uint_fast64_t;
-# define UINT_FAST64_MAX UINT_LEAST64_MAX
-# define  INT_FAST64_MAX  INT_LEAST64_MAX
-# define  INT_FAST64_MIN  INT_LEAST64_MIN
-#endif
-
-#undef stdint_int64_defined
-
-/*
- *  Whatever piecemeal, per compiler thing we can do about the wchar_t
- *  type limits.
- */
-
-#if defined(__WATCOMC__) || defined(_MSC_VER) || defined (__GNUC__) && !defined(vxWorks)
-# include <wchar.h>
-# ifndef WCHAR_MIN
-#  define WCHAR_MIN 0
-# endif
-# ifndef WCHAR_MAX
-#  define WCHAR_MAX ((wchar_t)-1)
-# endif
-#endif
-
-/*
- *  Whatever piecemeal, per compiler/platform thing we can do about the
- *  (u)intptr_t types and limits.
- */
-
-#if (defined (_MSC_VER) && defined (_UINTPTR_T_DEFINED)) || defined (_UINTPTR_T)
-# define STDINT_H_UINTPTR_T_DEFINED
-#endif
-
-#ifndef STDINT_H_UINTPTR_T_DEFINED
-# if defined (__alpha__) || defined (__ia64__) || defined (__x86_64__) || defined (_WIN64) || defined (__ppc64__)
-#  define stdint_intptr_bits 64
-# elif defined (__WATCOMC__) || defined (__TURBOC__)
-#  if defined(__TINY__) || defined(__SMALL__) || defined(__MEDIUM__)
-#    define stdint_intptr_bits 16
-#  else
-#    define stdint_intptr_bits 32
-#  endif
-# elif defined (__i386__) || defined (_WIN32) || defined (WIN32) || defined (__ppc64__)
-#  define stdint_intptr_bits 32
-# elif defined (__INTEL_COMPILER)
-/* TODO -- what did Intel do about x86-64? */
-# else
-/* #error "This platform might not be supported yet" */
-# endif
-
-# ifdef stdint_intptr_bits
-#  define stdint_intptr_glue3_i(a,b,c)  a##b##c
-#  define stdint_intptr_glue3(a,b,c)    stdint_intptr_glue3_i(a,b,c)
-#  ifndef PRINTF_INTPTR_MODIFIER
-#    define PRINTF_INTPTR_MODIFIER      stdint_intptr_glue3(PRINTF_INT,stdint_intptr_bits,_MODIFIER)
-#  endif
-#  ifndef PTRDIFF_MAX
-#    define PTRDIFF_MAX                 stdint_intptr_glue3(INT,stdint_intptr_bits,_MAX)
-#  endif
-#  ifndef PTRDIFF_MIN
-#    define PTRDIFF_MIN                 stdint_intptr_glue3(INT,stdint_intptr_bits,_MIN)
-#  endif
-#  ifndef UINTPTR_MAX
-#    define UINTPTR_MAX                 stdint_intptr_glue3(UINT,stdint_intptr_bits,_MAX)
-#  endif
-#  ifndef INTPTR_MAX
-#    define INTPTR_MAX                  stdint_intptr_glue3(INT,stdint_intptr_bits,_MAX)
-#  endif
-#  ifndef INTPTR_MIN
-#    define INTPTR_MIN                  stdint_intptr_glue3(INT,stdint_intptr_bits,_MIN)
-#  endif
-#  ifndef INTPTR_C
-#    define INTPTR_C(x)                 stdint_intptr_glue3(INT,stdint_intptr_bits,_C)(x)
-#  endif
-#  ifndef UINTPTR_C
-#    define UINTPTR_C(x)                stdint_intptr_glue3(UINT,stdint_intptr_bits,_C)(x)
-#  endif
-  typedef stdint_intptr_glue3(uint,stdint_intptr_bits,_t) uintptr_t;
-  typedef stdint_intptr_glue3( int,stdint_intptr_bits,_t)  intptr_t;
-# else
-/* TODO -- This following is likely wrong for some platforms, and does
-   nothing for the definition of uintptr_t. */
-  typedef ptrdiff_t intptr_t;
-# endif
-# define STDINT_H_UINTPTR_T_DEFINED
-#endif
-
-/*
- *  Assumes sig_atomic_t is signed and we have a 2s complement machine.
- */
-
-#ifndef SIG_ATOMIC_MAX
-# define SIG_ATOMIC_MAX ((((sig_atomic_t) 1) << (sizeof (sig_atomic_t)*CHAR_BIT-1)) - 1)
-#endif
-
-#endif
-
-#if defined (__TEST_PSTDINT_FOR_CORRECTNESS)
-
-/*
- *  Please compile with the maximum warning settings to make sure macros are
- *  not defined more than once.
- */
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <string.h>
-
-#define glue3_aux(x,y,z) x ## y ## z
-#define glue3(x,y,z) glue3_aux(x,y,z)
-
-#define DECLU(bits) glue3(uint,bits,_t) glue3(u,bits,) = glue3(UINT,bits,_C) (0);
-#define DECLI(bits) glue3(int,bits,_t) glue3(i,bits,) = glue3(INT,bits,_C) (0);
-
-#define DECL(us,bits) glue3(DECL,us,) (bits)
-
-#define TESTUMAX(bits) glue3(u,bits,) = ~glue3(u,bits,); if (glue3(UINT,bits,_MAX) != glue3(u,bits,)) printf ("Something wrong with UINT%d_MAX\n", bits)
-
-#define REPORTERROR(msg) { err_n++; if (err_first <= 0) err_first = __LINE__; printf msg; }
-
-int main () {
-	int err_n = 0;
-	int err_first = 0;
-	DECL(I,8)
-	DECL(U,8)
-	DECL(I,16)
-	DECL(U,16)
-	DECL(I,32)
-	DECL(U,32)
-#ifdef INT64_MAX
-	DECL(I,64)
-	DECL(U,64)
-#endif
-	intmax_t imax = INTMAX_C(0);
-	uintmax_t umax = UINTMAX_C(0);
-	char str0[256], str1[256];
-
-	sprintf (str0, "%" PRINTF_INT32_MODIFIER "d", INT32_C(2147483647));
-	if (0 != strcmp (str0, "2147483647")) REPORTERROR (("Something wrong with PRINTF_INT32_MODIFIER : %s\n", str0));
-	if (atoi(PRINTF_INT32_DEC_WIDTH) != (int) strlen(str0)) REPORTERROR (("Something wrong with PRINTF_INT32_DEC_WIDTH : %s\n", PRINTF_INT32_DEC_WIDTH));
-	sprintf (str0, "%" PRINTF_INT32_MODIFIER "u", UINT32_C(4294967295));
-	if (0 != strcmp (str0, "4294967295")) REPORTERROR (("Something wrong with PRINTF_INT32_MODIFIER : %s\n", str0));
-	if (atoi(PRINTF_UINT32_DEC_WIDTH) != (int) strlen(str0)) REPORTERROR (("Something wrong with PRINTF_UINT32_DEC_WIDTH : %s\n", PRINTF_UINT32_DEC_WIDTH));
-#ifdef INT64_MAX
-	sprintf (str1, "%" PRINTF_INT64_MODIFIER "d", INT64_C(9223372036854775807));
-	if (0 != strcmp (str1, "9223372036854775807")) REPORTERROR (("Something wrong with PRINTF_INT32_MODIFIER : %s\n", str1));
-	if (atoi(PRINTF_INT64_DEC_WIDTH) != (int) strlen(str1)) REPORTERROR (("Something wrong with PRINTF_INT64_DEC_WIDTH : %s, %d\n", PRINTF_INT64_DEC_WIDTH, (int) strlen(str1)));
-	sprintf (str1, "%" PRINTF_INT64_MODIFIER "u", UINT64_C(18446744073709550591));
-	if (0 != strcmp (str1, "18446744073709550591")) REPORTERROR (("Something wrong with PRINTF_INT32_MODIFIER : %s\n", str1));
-	if (atoi(PRINTF_UINT64_DEC_WIDTH) != (int) strlen(str1)) REPORTERROR (("Something wrong with PRINTF_UINT64_DEC_WIDTH : %s, %d\n", PRINTF_UINT64_DEC_WIDTH, (int) strlen(str1)));
-#endif
-
-	sprintf (str0, "%d %x\n", 0, ~0);
-
-	sprintf (str1, "%d %x\n",  i8, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with i8 : %s\n", str1));
-	sprintf (str1, "%u %x\n",  u8, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with u8 : %s\n", str1));
-	sprintf (str1, "%d %x\n",  i16, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with i16 : %s\n", str1));
-	sprintf (str1, "%u %x\n",  u16, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with u16 : %s\n", str1));
-	sprintf (str1, "%" PRINTF_INT32_MODIFIER "d %x\n",  i32, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with i32 : %s\n", str1));
-	sprintf (str1, "%" PRINTF_INT32_MODIFIER "u %x\n",  u32, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with u32 : %s\n", str1));
-#ifdef INT64_MAX
-	sprintf (str1, "%" PRINTF_INT64_MODIFIER "d %x\n",  i64, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with i64 : %s\n", str1));
-#endif
-	sprintf (str1, "%" PRINTF_INTMAX_MODIFIER "d %x\n",  imax, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with imax : %s\n", str1));
-	sprintf (str1, "%" PRINTF_INTMAX_MODIFIER "u %x\n",  umax, ~0);
-	if (0 != strcmp (str0, str1)) REPORTERROR (("Something wrong with umax : %s\n", str1));
-
-	TESTUMAX(8);
-	TESTUMAX(16);
-	TESTUMAX(32);
-#ifdef INT64_MAX
-	TESTUMAX(64);
-#endif
-
-#define STR(v) #v
-#define Q(v) printf ("sizeof " STR(v) " = %u\n", (unsigned) sizeof (v));
-	if (err_n) {
-		printf ("pstdint.h is not correct.  Please use sizes below to correct it:\n");
-	}
-
-	Q(int)
-	Q(unsigned)
-	Q(long int)
-	Q(short int)
-	Q(int8_t)
-	Q(int16_t)
-	Q(int32_t)
-#ifdef INT64_MAX
-	Q(int64_t)
-#endif
-
-	return EXIT_SUCCESS;
-}
-
-#endif
diff --git a/thirdparty/assimp/include/assimp/Compiler/pushpack1.h b/thirdparty/assimp/include/assimp/Compiler/pushpack1.h
deleted file mode 100644
index 4c9fbb857f..0000000000
--- a/thirdparty/assimp/include/assimp/Compiler/pushpack1.h
+++ /dev/null
@@ -1,43 +0,0 @@
-
-
-// ===============================================================================
-// May be included multiple times - sets structure packing to 1 
-// for all supported compilers. #include <poppack1.h> reverts the changes.
-//
-// Currently this works on the following compilers:
-// MSVC 7,8,9
-// GCC
-// BORLAND (complains about 'pack state changed but not reverted', but works)
-// Clang
-//
-//
-// USAGE:
-//
-// struct StructToBePacked {
-// } PACK_STRUCT;
-//
-// ===============================================================================
-
-#ifdef AI_PUSHPACK_IS_DEFINED
-#	error poppack1.h must be included after pushpack1.h
-#endif
-
-#if defined(_MSC_VER) ||  defined(__BORLANDC__) ||	defined (__BCPLUSPLUS__)
-#	pragma pack(push,1)
-#	define PACK_STRUCT
-#elif defined( __GNUC__ ) || defined(__clang__)
-#	if !defined(HOST_MINGW)
-#		define PACK_STRUCT	__attribute__((__packed__))
-#	else
-#		define PACK_STRUCT	__attribute__((gcc_struct, __packed__))
-#	endif
-#else
-#	error Compiler not supported
-#endif
-
-#if defined(_MSC_VER)
-// C4103: Packing was changed after the inclusion of the header, probably missing #pragma pop
-#	pragma warning (disable : 4103) 
-#endif
-
-#define AI_PUSHPACK_IS_DEFINED
diff --git a/thirdparty/assimp/include/assimp/CreateAnimMesh.h b/thirdparty/assimp/include/assimp/CreateAnimMesh.h
deleted file mode 100644
index 1266d1de11..0000000000
--- a/thirdparty/assimp/include/assimp/CreateAnimMesh.h
+++ /dev/null
@@ -1,68 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file CreateAnimMesh.h
- *  Create AnimMesh from Mesh
- */
-#pragma once
-#ifndef INCLUDED_AI_CREATE_ANIM_MESH_H
-#define INCLUDED_AI_CREATE_ANIM_MESH_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/mesh.h>
-
-namespace Assimp {
-
-/**
- *  Create aiAnimMesh from aiMesh.
- *  @param  mesh    The input mesh to create an animated mesh from.
- *  @return The new created animated mesh.
- */
-ASSIMP_API aiAnimMesh *aiCreateAnimMesh(const aiMesh *mesh);
-
-} // end of namespace Assimp
-
-#endif // INCLUDED_AI_CREATE_ANIM_MESH_H
-
diff --git a/thirdparty/assimp/include/assimp/DefaultIOStream.h b/thirdparty/assimp/include/assimp/DefaultIOStream.h
deleted file mode 100644
index c6d382c1b5..0000000000
--- a/thirdparty/assimp/include/assimp/DefaultIOStream.h
+++ /dev/null
@@ -1,139 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Default file I/O using fXXX()-family of functions */
-#pragma once
-#ifndef AI_DEFAULTIOSTREAM_H_INC
-#define AI_DEFAULTIOSTREAM_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <stdio.h>
-#include <assimp/IOStream.hpp>
-#include <assimp/importerdesc.h>
-#include <assimp/Defines.h>
-
-namespace Assimp {
-
-// ----------------------------------------------------------------------------------
-//! @class  DefaultIOStream
-//! @brief  Default IO implementation, use standard IO operations
-//! @note   An instance of this class can exist without a valid file handle
-//!         attached to it. All calls fail, but the instance can nevertheless be
-//!         used with no restrictions.
-class ASSIMP_API DefaultIOStream : public IOStream {
-    friend class DefaultIOSystem;
-#if __ANDROID__
-# if __ANDROID_API__ > 9
-#  if defined(AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT)
-    friend class AndroidJNIIOSystem;
-#  endif // defined(AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT)
-# endif // __ANDROID_API__ > 9
-#endif // __ANDROID__
-
-protected:
-    DefaultIOStream() AI_NO_EXCEPT;
-    DefaultIOStream(FILE* pFile, const std::string &strFilename);
-
-public:
-    /** Destructor public to allow simple deletion to close the file. */
-    ~DefaultIOStream ();
-
-    // -------------------------------------------------------------------
-    /// Read from stream
-    size_t Read(void* pvBuffer,
-        size_t pSize,
-        size_t pCount);
-
-    // -------------------------------------------------------------------
-    /// Write to stream
-    size_t Write(const void* pvBuffer,
-        size_t pSize,
-        size_t pCount);
-
-    // -------------------------------------------------------------------
-    /// Seek specific position
-    aiReturn Seek(size_t pOffset,
-        aiOrigin pOrigin);
-
-    // -------------------------------------------------------------------
-    /// Get current seek position
-    size_t Tell() const;
-
-    // -------------------------------------------------------------------
-    /// Get size of file
-    size_t FileSize() const;
-
-    // -------------------------------------------------------------------
-    /// Flush file contents
-    void Flush();
-
-private:
-    FILE* mFile;
-    std::string mFilename;
-    mutable size_t mCachedSize;
-};
-
-// ----------------------------------------------------------------------------------
-AI_FORCE_INLINE
-DefaultIOStream::DefaultIOStream() AI_NO_EXCEPT
-: mFile(nullptr)
-, mFilename("")
-, mCachedSize(SIZE_MAX) {
-    // empty
-}
-
-// ----------------------------------------------------------------------------------
-AI_FORCE_INLINE
-DefaultIOStream::DefaultIOStream (FILE* pFile, const std::string &strFilename)
-: mFile(pFile)
-, mFilename(strFilename)
-, mCachedSize(SIZE_MAX) {
-    // empty
-}
-// ----------------------------------------------------------------------------------
-
-} // ns assimp
-
-#endif //!!AI_DEFAULTIOSTREAM_H_INC
diff --git a/thirdparty/assimp/include/assimp/DefaultIOSystem.h b/thirdparty/assimp/include/assimp/DefaultIOSystem.h
deleted file mode 100644
index 46f6d447c5..0000000000
--- a/thirdparty/assimp/include/assimp/DefaultIOSystem.h
+++ /dev/null
@@ -1,98 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Default implementation of IOSystem using the standard C file functions */
-#pragma once
-#ifndef AI_DEFAULTIOSYSTEM_H_INC
-#define AI_DEFAULTIOSYSTEM_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/IOSystem.hpp>
-
-namespace Assimp    {
-
-// ---------------------------------------------------------------------------
-/** Default implementation of IOSystem using the standard C file functions */
-class ASSIMP_API DefaultIOSystem : public IOSystem {
-public:
-    // -------------------------------------------------------------------
-    /** Tests for the existence of a file at the given path. */
-    bool Exists( const char* pFile) const;
-
-    // -------------------------------------------------------------------
-    /** Returns the directory separator. */
-    char getOsSeparator() const;
-
-    // -------------------------------------------------------------------
-    /** Open a new file with a given path. */
-    IOStream* Open( const char* pFile, const char* pMode = "rb");
-
-    // -------------------------------------------------------------------
-    /** Closes the given file and releases all resources associated with it. */
-    void Close( IOStream* pFile);
-
-    // -------------------------------------------------------------------
-    /** Compare two paths */
-    bool ComparePaths (const char* one, const char* second) const;
-
-    /** @brief get the file name of a full filepath
-     * example: /tmp/archive.tar.gz -> archive.tar.gz
-     */
-    static std::string fileName( const std::string &path );
-
-    /** @brief get the complete base name of a full filepath
-     * example: /tmp/archive.tar.gz -> archive.tar
-     */
-    static std::string completeBaseName( const std::string &path);
-
-    /** @brief get the path of a full filepath
-     * example: /tmp/archive.tar.gz -> /tmp/
-     */
-    static std::string absolutePath( const std::string &path);
-};
-
-} //!ns Assimp
-
-#endif //AI_DEFAULTIOSYSTEM_H_INC
diff --git a/thirdparty/assimp/include/assimp/DefaultLogger.hpp b/thirdparty/assimp/include/assimp/DefaultLogger.hpp
deleted file mode 100644
index 1946e250a6..0000000000
--- a/thirdparty/assimp/include/assimp/DefaultLogger.hpp
+++ /dev/null
@@ -1,188 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-/** @file DefaultLogger.hpp
-*/
-
-#ifndef INCLUDED_AI_DEFAULTLOGGER
-#define INCLUDED_AI_DEFAULTLOGGER
-
-#include "Logger.hpp"
-#include "LogStream.hpp"
-#include "NullLogger.hpp"
-#include <vector>
-
-namespace Assimp    {
-// ------------------------------------------------------------------------------------
-class IOStream;
-struct LogStreamInfo;
-
-/** default name of logfile */
-#define ASSIMP_DEFAULT_LOG_NAME "AssimpLog.txt"
-
-// ------------------------------------------------------------------------------------
-/** @brief CPP-API: Primary logging facility of Assimp.
- *
- *  The library stores its primary #Logger as a static member of this class.
- *  #get() returns this primary logger. By default the underlying implementation is
- *  just a #NullLogger which rejects all log messages. By calling #create(), logging
- *  is turned on. To capture the log output multiple log streams (#LogStream) can be
- *  attach to the logger. Some default streams for common streaming locations (such as
- *  a file, std::cout, OutputDebugString()) are also provided.
- *
- *  If you wish to customize the logging at an even deeper level supply your own
- *  implementation of #Logger to #set().
- *  @note The whole logging stuff causes a small extra overhead for all imports. */
-class ASSIMP_API DefaultLogger :
-    public Logger   {
-
-public:
-
-    // ----------------------------------------------------------------------
-    /** @brief Creates a logging instance.
-     *  @param name Name for log file. Only valid in combination
-     *    with the aiDefaultLogStream_FILE flag.
-     *  @param severity Log severity, VERBOSE turns on debug messages
-     *  @param defStreams  Default log streams to be attached. Any bitwise
-     *    combination of the aiDefaultLogStream enumerated values.
-     *    If #aiDefaultLogStream_FILE is specified but an empty string is
-     *    passed for 'name', no log file is created at all.
-     *  @param  io IOSystem to be used to open external files (such as the
-     *   log file). Pass NULL to rely on the default implementation.
-     *  This replaces the default #NullLogger with a #DefaultLogger instance. */
-    static Logger *create(const char* name = ASSIMP_DEFAULT_LOG_NAME,
-        LogSeverity severity    = NORMAL,
-        unsigned int defStreams = aiDefaultLogStream_DEBUGGER | aiDefaultLogStream_FILE,
-        IOSystem* io            = NULL);
-
-    // ----------------------------------------------------------------------
-    /** @brief Setup a custom #Logger implementation.
-     *
-     *  Use this if the provided #DefaultLogger class doesn't fit into
-     *  your needs. If the provided message formatting is OK for you,
-     *  it's much easier to use #create() and to attach your own custom
-     *  output streams to it.
-     *  @param logger Pass NULL to setup a default NullLogger*/
-    static void set (Logger *logger);
-
-    // ----------------------------------------------------------------------
-    /** @brief  Getter for singleton instance
-     *   @return Only instance. This is never null, but it could be a
-     *  NullLogger. Use isNullLogger to check this.*/
-    static Logger *get();
-
-    // ----------------------------------------------------------------------
-    /** @brief  Return whether a #NullLogger is currently active
-     *  @return true if the current logger is a #NullLogger.
-     *  Use create() or set() to setup a logger that does actually do
-     *  something else than just rejecting all log messages. */
-    static bool isNullLogger();
-
-    // ----------------------------------------------------------------------
-    /** @brief  Kills the current singleton logger and replaces it with a
-     *  #NullLogger instance. */
-    static void kill();
-
-    // ----------------------------------------------------------------------
-    /** @copydoc Logger::attachStream   */
-    bool attachStream(LogStream *pStream,
-        unsigned int severity);
-
-    // ----------------------------------------------------------------------
-    /** @copydoc Logger::detatchStream */
-    bool detatchStream(LogStream *pStream,
-        unsigned int severity);
-
-private:
-    // ----------------------------------------------------------------------
-    /** @briefPrivate construction for internal use by create().
-     *  @param severity Logging granularity  */
-    explicit DefaultLogger(LogSeverity severity);
-
-    // ----------------------------------------------------------------------
-    /** @briefDestructor    */
-    ~DefaultLogger();
-
-    /** @brief  Logs debug infos, only been written when severity level VERBOSE is set */
-    void OnDebug(const char* message);
-
-    /** @brief  Logs an info message */
-    void OnInfo(const char*  message);
-
-    /** @brief  Logs a warning message */
-    void OnWarn(const char*  message);
-
-    /** @brief  Logs an error message */
-    void OnError(const char* message);
-
-    // ----------------------------------------------------------------------
-    /** @brief Writes a message to all streams */
-    void WriteToStreams(const char* message, ErrorSeverity ErrorSev );
-
-    // ----------------------------------------------------------------------
-    /** @brief Returns the thread id.
-     *  @note This is an OS specific feature, if not supported, a
-     *    zero will be returned.
-     */
-    unsigned int GetThreadID();
-
-private:
-    //  Aliases for stream container
-    typedef std::vector<LogStreamInfo*> StreamArray;
-    typedef std::vector<LogStreamInfo*>::iterator StreamIt;
-    typedef std::vector<LogStreamInfo*>::const_iterator ConstStreamIt;
-
-    //! only logging instance
-    static Logger *m_pLogger;
-    static NullLogger s_pNullLogger;
-
-    //! Attached streams
-    StreamArray m_StreamArray;
-
-    bool noRepeatMsg;
-    char lastMsg[MAX_LOG_MESSAGE_LENGTH*2];
-    size_t lastLen;
-};
-// ------------------------------------------------------------------------------------
-
-} // Namespace Assimp
-
-#endif // !! INCLUDED_AI_DEFAULTLOGGER
diff --git a/thirdparty/assimp/include/assimp/Defines.h b/thirdparty/assimp/include/assimp/Defines.h
deleted file mode 100644
index be3e2fafd6..0000000000
--- a/thirdparty/assimp/include/assimp/Defines.h
+++ /dev/null
@@ -1,58 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2012, assimp team
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-#pragma once
-#ifndef AI_DEFINES_H_INC
-#define AI_DEFINES_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-// We need those constants, workaround for any platforms where nobody defined them yet
-#if (!defined SIZE_MAX)
-#   define SIZE_MAX (~((size_t)0))
-#endif
-
-#if (!defined UINT_MAX)
-#   define UINT_MAX (~((unsigned int)0))
-#endif
-
-#endif // AI_DEINES_H_INC
diff --git a/thirdparty/assimp/include/assimp/Exceptional.h b/thirdparty/assimp/include/assimp/Exceptional.h
deleted file mode 100644
index 6bb6ce1e39..0000000000
--- a/thirdparty/assimp/include/assimp/Exceptional.h
+++ /dev/null
@@ -1,128 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2008, assimp team
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-#pragma once
-#ifndef AI_INCLUDED_EXCEPTIONAL_H
-#define AI_INCLUDED_EXCEPTIONAL_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <stdexcept>
-#include <assimp/DefaultIOStream.h>
-
-using std::runtime_error;
-
-#ifdef _MSC_VER
-#   pragma warning(disable : 4275)
-#endif
-
-// ---------------------------------------------------------------------------
-/** FOR IMPORTER PLUGINS ONLY: Simple exception class to be thrown if an
- *  unrecoverable error occurs while importing. Loading APIs return
- *  NULL instead of a valid aiScene then.  */
-class DeadlyImportError : public runtime_error {
-public:
-    /** Constructor with arguments */
-    explicit DeadlyImportError( const std::string& errorText)
-    : runtime_error(errorText) {
-        // empty
-    }
-
-};
-
-typedef DeadlyImportError DeadlyExportError;
-
-#ifdef _MSC_VER
-#   pragma warning(default : 4275)
-#endif
-
-// ---------------------------------------------------------------------------
-template <typename T>
-struct ExceptionSwallower   {
-    T operator ()() const {
-        return T();
-    }
-};
-
-// ---------------------------------------------------------------------------
-template <typename T>
-struct ExceptionSwallower<T*>   {
-    T* operator ()() const {
-        return nullptr;
-    }
-};
-
-// ---------------------------------------------------------------------------
-template <>
-struct ExceptionSwallower<aiReturn> {
-    aiReturn operator ()() const {
-        try {
-            throw;
-        }
-        catch (std::bad_alloc&) {
-            return aiReturn_OUTOFMEMORY;
-        }
-        catch (...) {
-            return aiReturn_FAILURE;
-        }
-    }
-};
-
-// ---------------------------------------------------------------------------
-template <>
-struct ExceptionSwallower<void> {
-    void operator ()() const {
-        return;
-    }
-};
-
-#define ASSIMP_BEGIN_EXCEPTION_REGION()\
-{\
-    try {
-
-#define ASSIMP_END_EXCEPTION_REGION(type)\
-    } catch(...) {\
-        return ExceptionSwallower<type>()();\
-    }\
-}
-
-#endif // AI_INCLUDED_EXCEPTIONAL_H
diff --git a/thirdparty/assimp/include/assimp/Exporter.hpp b/thirdparty/assimp/include/assimp/Exporter.hpp
deleted file mode 100644
index 2612e1f9d2..0000000000
--- a/thirdparty/assimp/include/assimp/Exporter.hpp
+++ /dev/null
@@ -1,509 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  Exporter.hpp
-*  @brief Defines the CPP-API for the Assimp export interface
-*/
-#pragma once
-#ifndef AI_EXPORT_HPP_INC
-#define AI_EXPORT_HPP_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifndef ASSIMP_BUILD_NO_EXPORT
-
-#include "cexport.h"
-#include <map>
-
-namespace Assimp {
-    
-class ExporterPimpl;
-class IOSystem;
-class ProgressHandler;
-
-// ----------------------------------------------------------------------------------
-/** CPP-API: The Exporter class forms an C++ interface to the export functionality
- * of the Open Asset Import Library. Note that the export interface is available
- * only if Assimp has been built with ASSIMP_BUILD_NO_EXPORT not defined.
- *
- * The interface is modeled after the importer interface and mostly
- * symmetric. The same rules for threading etc. apply.
- *
- * In a nutshell, there are two export interfaces: #Export, which writes the
- * output file(s) either to the regular file system or to a user-supplied
- * #IOSystem, and #ExportToBlob which returns a linked list of memory
- * buffers (blob), each referring to one output file (in most cases
- * there will be only one output file of course, but this extra complexity is
- * needed since Assimp aims at supporting a wide range of file formats).
- *
- * #ExportToBlob is especially useful if you intend to work
- * with the data in-memory.
-*/
-class ASSIMP_API ExportProperties;
-
-class ASSIMP_API Exporter {
-public:
-    /** Function pointer type of a Export worker function */
-    typedef void (*fpExportFunc)(const char*, IOSystem*, const aiScene*, const ExportProperties*);
-
-    /** Internal description of an Assimp export format option */
-    struct ExportFormatEntry {
-        /// Public description structure to be returned by aiGetExportFormatDescription()
-        aiExportFormatDesc mDescription;
-
-        // Worker function to do the actual exporting
-        fpExportFunc mExportFunction;
-
-        // Post-processing steps to be executed PRIOR to invoking mExportFunction
-        unsigned int mEnforcePP;
-
-        // Constructor to fill all entries
-        ExportFormatEntry( const char* pId, const char* pDesc, const char* pExtension, fpExportFunc pFunction, unsigned int pEnforcePP = 0u)
-        {
-            mDescription.id = pId;
-            mDescription.description = pDesc;
-            mDescription.fileExtension = pExtension;
-            mExportFunction = pFunction;
-            mEnforcePP = pEnforcePP;
-        }
-
-        ExportFormatEntry() :
-            mExportFunction()
-          , mEnforcePP()
-        {
-            mDescription.id = NULL;
-            mDescription.description = NULL;
-            mDescription.fileExtension = NULL;
-        }
-    };
-
-    /**
-     *  @brief  The class constructor.
-     */
-    Exporter();
-
-    /**
-    *  @brief  The class destructor.
-    */
-    ~Exporter();
-
-    // -------------------------------------------------------------------
-    /** Supplies a custom IO handler to the exporter to use to open and
-     * access files.
-     *
-     * If you need #Export to use custom IO logic to access the files,
-     * you need to supply a custom implementation of IOSystem and
-     * IOFile to the exporter.
-     *
-     * #Exporter takes ownership of the object and will destroy it
-     * afterwards. The previously assigned handler will be deleted.
-     * Pass NULL to take again ownership of your IOSystem and reset Assimp
-     * to use its default implementation, which uses plain file IO.
-     *
-     * @param pIOHandler The IO handler to be used in all file accesses
-     *   of the Importer. */
-    void SetIOHandler( IOSystem* pIOHandler);
-
-    // -------------------------------------------------------------------
-    /** Retrieves the IO handler that is currently set.
-     * You can use #IsDefaultIOHandler() to check whether the returned
-     * interface is the default IO handler provided by ASSIMP. The default
-     * handler is active as long the application doesn't supply its own
-     * custom IO handler via #SetIOHandler().
-     * @return A valid IOSystem interface, never NULL. */
-    IOSystem* GetIOHandler() const;
-
-    // -------------------------------------------------------------------
-    /** Checks whether a default IO handler is active
-     * A default handler is active as long the application doesn't
-     * supply its own custom IO handler via #SetIOHandler().
-     * @return true by default */
-    bool IsDefaultIOHandler() const;
-
-    // -------------------------------------------------------------------
-    /** Supplies a custom progress handler to the exporter. This
-     *  interface exposes an #Update() callback, which is called
-     *  more or less periodically (please don't sue us if it
-     *  isn't as periodically as you'd like it to have ...).
-     *  This can be used to implement progress bars and loading
-     *  timeouts.
-     *  @param pHandler Progress callback interface. Pass nullptr to
-     *    disable progress reporting.
-     *  @note Progress handlers can be used to abort the loading
-     *    at almost any time.*/
-    void SetProgressHandler(ProgressHandler* pHandler);
-
-    // -------------------------------------------------------------------
-    /** Exports the given scene to a chosen file format. Returns the exported
-    * data as a binary blob which you can write into a file or something.
-    * When you're done with the data, simply let the #Exporter instance go
-    * out of scope to have it released automatically.
-    * @param pScene The scene to export. Stays in possession of the caller,
-    *   is not changed by the function.
-    * @param pFormatId ID string to specify to which format you want to
-    *   export to. Use
-    * #GetExportFormatCount / #GetExportFormatDescription to learn which
-    *   export formats are available.
-    * @param pPreprocessing See the documentation for #Export
-    * @return the exported data or NULL in case of error.
-    * @note If the Exporter instance did already hold a blob from
-    *   a previous call to #ExportToBlob, it will be disposed.
-    *   Any IO handlers set via #SetIOHandler are ignored here.
-    * @note Use aiCopyScene() to get a modifiable copy of a previously
-    *   imported scene. */
-    const aiExportDataBlob* ExportToBlob(const aiScene* pScene, const char* pFormatId,
-        unsigned int pPreprocessing = 0u, const ExportProperties* pProperties = nullptr);
-    const aiExportDataBlob* ExportToBlob(  const aiScene* pScene, const std::string& pFormatId,
-        unsigned int pPreprocessing = 0u, const ExportProperties* pProperties = nullptr);
-
-    // -------------------------------------------------------------------
-    /** Convenience function to export directly to a file. Use
-     *  #SetIOSystem to supply a custom IOSystem to gain fine-grained control
-     *  about the output data flow of the export process.
-     * @param pBlob A data blob obtained from a previous call to #aiExportScene. Must not be NULL.
-     * @param pPath Full target file name. Target must be accessible.
-     * @param pPreprocessing Accepts any choice of the #aiPostProcessSteps enumerated
-     *   flags, but in reality only a subset of them makes sense here. Specifying
-     *   'preprocessing' flags is useful if the input scene does not conform to
-     *   Assimp's default conventions as specified in the @link data Data Structures Page @endlink.
-     *   In short, this means the geometry data should use a right-handed coordinate systems, face
-     *   winding should be counter-clockwise and the UV coordinate origin is assumed to be in
-     *   the upper left. The #aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
-     *   #aiProcess_FlipWindingOrder flags are used in the import side to allow users
-     *   to have those defaults automatically adapted to their conventions. Specifying those flags
-     *   for exporting has the opposite effect, respectively. Some other of the
-     *   #aiPostProcessSteps enumerated values may be useful as well, but you'll need
-     *   to try out what their effect on the exported file is. Many formats impose
-     *   their own restrictions on the structure of the geometry stored therein,
-     *   so some preprocessing may have little or no effect at all, or may be
-     *   redundant as exporters would apply them anyhow. A good example
-     *   is triangulation - whilst you can enforce it by specifying
-     *   the #aiProcess_Triangulate flag, most export formats support only
-     *   triangulate data so they would run the step even if it wasn't requested.
-     *
-     *   If assimp detects that the input scene was directly taken from the importer side of
-     *   the library (i.e. not copied using aiCopyScene and potentially modified afterwards),
-     *   any post-processing steps already applied to the scene will not be applied again, unless
-     *   they show non-idempotent behavior (#aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
-     *   #aiProcess_FlipWindingOrder).
-     * @return AI_SUCCESS if everything was fine.
-     * @note Use aiCopyScene() to get a modifiable copy of a previously
-     *   imported scene.*/
-    aiReturn Export( const aiScene* pScene, const char* pFormatId, const char* pPath,
-        unsigned int pPreprocessing = 0u, const ExportProperties* pProperties = nullptr);
-    aiReturn Export( const aiScene* pScene, const std::string& pFormatId, const std::string& pPath,
-        unsigned int pPreprocessing = 0u, const ExportProperties* pProperties = nullptr);
-
-    // -------------------------------------------------------------------
-    /** Returns an error description of an error that occurred in #Export
-     *    or #ExportToBlob
-     *
-     * Returns an empty string if no error occurred.
-     * @return A description of the last error, an empty string if no
-     *   error occurred. The string is never NULL.
-     *
-     * @note The returned function remains valid until one of the
-     * following methods is called: #Export, #ExportToBlob, #FreeBlob */
-    const char* GetErrorString() const;
-
-    // -------------------------------------------------------------------
-    /** Return the blob obtained from the last call to #ExportToBlob */
-    const aiExportDataBlob* GetBlob() const;
-
-    // -------------------------------------------------------------------
-    /** Orphan the blob from the last call to #ExportToBlob. This means
-     *  the caller takes ownership and is thus responsible for calling
-     *  the C API function #aiReleaseExportBlob to release it. */
-    const aiExportDataBlob* GetOrphanedBlob() const;
-
-    // -------------------------------------------------------------------
-    /** Frees the current blob.
-     *
-     *  The function does nothing if no blob has previously been
-     *  previously produced via #ExportToBlob. #FreeBlob is called
-     *  automatically by the destructor. The only reason to call
-     *  it manually would be to reclaim as much storage as possible
-     *  without giving up the #Exporter instance yet. */
-    void FreeBlob( );
-
-    // -------------------------------------------------------------------
-    /** Returns the number of export file formats available in the current
-     *  Assimp build. Use #Exporter::GetExportFormatDescription to
-     *  retrieve infos of a specific export format.
-     *
-     *  This includes built-in exporters as well as exporters registered
-     *  using #RegisterExporter.
-     **/
-    size_t GetExportFormatCount() const;
-
-    // -------------------------------------------------------------------
-    /** Returns a description of the nth export file format. Use #
-     *  #Exporter::GetExportFormatCount to learn how many export
-     *  formats are supported.
-     *
-     * The returned pointer is of static storage duration if the
-     * pIndex pertains to a built-in exporter (i.e. one not registered
-     * via #RegistrerExporter). It is restricted to the life-time of the
-     * #Exporter instance otherwise.
-     *
-     * @param pIndex Index of the export format to retrieve information
-     *  for. Valid range is 0 to #Exporter::GetExportFormatCount
-     * @return A description of that specific export format.
-     *  NULL if pIndex is out of range. */
-    const aiExportFormatDesc* GetExportFormatDescription( size_t pIndex ) const;
-
-    // -------------------------------------------------------------------
-    /** Register a custom exporter. Custom export formats are limited to
-     *    to the current #Exporter instance and do not affect the
-     *    library globally. The indexes under which the format's
-     *    export format description can be queried are assigned
-     *    monotonously.
-     *  @param desc Exporter description.
-     *  @return aiReturn_SUCCESS if the export format was successfully
-     *    registered. A common cause that would prevent an exporter
-     *    from being registered is that its format id is already
-     *    occupied by another format. */
-    aiReturn RegisterExporter(const ExportFormatEntry& desc);
-
-    // -------------------------------------------------------------------
-    /** Remove an export format previously registered with #RegisterExporter
-     *  from the #Exporter instance (this can also be used to drop
-     *  built-in exporters because those are implicitly registered
-     *  using #RegisterExporter).
-     *  @param id Format id to be unregistered, this refers to the
-     *    'id' field of #aiExportFormatDesc.
-     *  @note Calling this method on a format description not yet registered
-     *    has no effect.*/
-    void UnregisterExporter(const char* id);
-
-protected:
-    // Just because we don't want you to know how we're hacking around.
-    ExporterPimpl* pimpl;
-};
-
-class ASSIMP_API ExportProperties {
-public:
-    // Data type to store the key hash
-    typedef unsigned int KeyType;
-
-    // typedefs for our four configuration maps.
-    // We don't need more, so there is no need for a generic solution
-    typedef std::map<KeyType, int> IntPropertyMap;
-    typedef std::map<KeyType, ai_real> FloatPropertyMap;
-    typedef std::map<KeyType, std::string> StringPropertyMap;
-    typedef std::map<KeyType, aiMatrix4x4> MatrixPropertyMap;
-
-public:
-    /** Standard constructor
-    * @see ExportProperties()
-    */
-    ExportProperties();
-
-    // -------------------------------------------------------------------
-    /** Copy constructor.
-     *
-     * This copies the configuration properties of another ExportProperties.
-     * @see ExportProperties(const ExportProperties& other)
-     */
-    ExportProperties(const ExportProperties& other);
-
-    // -------------------------------------------------------------------
-    /** Set an integer configuration property.
-     * @param szName Name of the property. All supported properties
-     *   are defined in the aiConfig.g header (all constants share the
-     *   prefix AI_CONFIG_XXX and are simple strings).
-     * @param iValue New value of the property
-     * @return true if the property was set before. The new value replaces
-     *   the previous value in this case.
-     * @note Property of different types (float, int, string ..) are kept
-     *   on different stacks, so calling SetPropertyInteger() for a
-     *   floating-point property has no effect - the loader will call
-     *   GetPropertyFloat() to read the property, but it won't be there.
-     */
-    bool SetPropertyInteger(const char* szName, int iValue);
-
-    // -------------------------------------------------------------------
-    /** Set a boolean configuration property. Boolean properties
-     *  are stored on the integer stack internally so it's possible
-     *  to set them via #SetPropertyBool and query them with
-     *  #GetPropertyBool and vice versa.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyBool(const char* szName, bool value)    {
-        return SetPropertyInteger(szName,value);
-    }
-
-    // -------------------------------------------------------------------
-    /** Set a floating-point configuration property.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyFloat(const char* szName, ai_real fValue);
-
-    // -------------------------------------------------------------------
-    /** Set a string configuration property.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyString(const char* szName, const std::string& sValue);
-
-    // -------------------------------------------------------------------
-    /** Set a matrix configuration property.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyMatrix(const char* szName, const aiMatrix4x4& sValue);
-
-    // -------------------------------------------------------------------
-    /** Get a configuration property.
-     * @param szName Name of the property. All supported properties
-     *   are defined in the aiConfig.g header (all constants share the
-     *   prefix AI_CONFIG_XXX).
-     * @param iErrorReturn Value that is returned if the property
-     *   is not found.
-     * @return Current value of the property
-     * @note Property of different types (float, int, string ..) are kept
-     *   on different lists, so calling SetPropertyInteger() for a
-     *   floating-point property has no effect - the loader will call
-     *   GetPropertyFloat() to read the property, but it won't be there.
-     */
-    int GetPropertyInteger(const char* szName,
-        int iErrorReturn = 0xffffffff) const;
-
-    // -------------------------------------------------------------------
-    /** Get a boolean configuration property. Boolean properties
-     *  are stored on the integer stack internally so it's possible
-     *  to set them via #SetPropertyBool and query them with
-     *  #GetPropertyBool and vice versa.
-     * @see GetPropertyInteger()
-     */
-    bool GetPropertyBool(const char* szName, bool bErrorReturn = false) const {
-        return GetPropertyInteger(szName,bErrorReturn)!=0;
-    }
-
-    // -------------------------------------------------------------------
-    /** Get a floating-point configuration property
-     * @see GetPropertyInteger()
-     */
-    ai_real GetPropertyFloat(const char* szName,
-        ai_real fErrorReturn = 10e10f) const;
-
-    // -------------------------------------------------------------------
-    /** Get a string configuration property
-     *
-     *  The return value remains valid until the property is modified.
-     * @see GetPropertyInteger()
-     */
-    const std::string GetPropertyString(const char* szName,
-        const std::string& sErrorReturn = "") const;
-
-    // -------------------------------------------------------------------
-    /** Get a matrix configuration property
-     *
-     *  The return value remains valid until the property is modified.
-     * @see GetPropertyInteger()
-     */
-    const aiMatrix4x4 GetPropertyMatrix(const char* szName,
-        const aiMatrix4x4& sErrorReturn = aiMatrix4x4()) const;
-
-    // -------------------------------------------------------------------
-    /** Determine a integer configuration property has been set.
-    * @see HasPropertyInteger()
-     */
-    bool HasPropertyInteger(const char* szName) const;
-
-    /** Determine a boolean configuration property has been set.
-    * @see HasPropertyBool()
-     */
-    bool HasPropertyBool(const char* szName) const;
-
-    /** Determine a boolean configuration property has been set.
-    * @see HasPropertyFloat()
-     */
-    bool HasPropertyFloat(const char* szName) const;
-
-    /** Determine a String configuration property has been set.
-    * @see HasPropertyString()
-     */
-    bool HasPropertyString(const char* szName) const;
-
-    /** Determine a Matrix configuration property has been set.
-    * @see HasPropertyMatrix()
-     */
-    bool HasPropertyMatrix(const char* szName) const;
-
-protected:
-
-    /** List of integer properties */
-    IntPropertyMap mIntProperties;
-
-    /** List of floating-point properties */
-    FloatPropertyMap mFloatProperties;
-
-    /** List of string properties */
-    StringPropertyMap mStringProperties;
-
-    /** List of Matrix properties */
-    MatrixPropertyMap mMatrixProperties;
-};
-
-// ----------------------------------------------------------------------------------
-inline 
-const aiExportDataBlob* Exporter::ExportToBlob(  const aiScene* pScene, const std::string& pFormatId,
-                                                 unsigned int pPreprocessing, const ExportProperties* pProperties)
-{
-    return ExportToBlob(pScene,pFormatId.c_str(),pPreprocessing, pProperties);
-}
-
-// ----------------------------------------------------------------------------------
-inline
-aiReturn Exporter :: Export( const aiScene* pScene, const std::string& pFormatId, 
-                                    const std::string& pPath, unsigned int pPreprocessing, 
-                                    const ExportProperties* pProperties)
-{
-    return Export(pScene,pFormatId.c_str(),pPath.c_str(),pPreprocessing, pProperties);
-}
-
-} // namespace Assimp
-
-#endif // ASSIMP_BUILD_NO_EXPORT
-#endif // AI_EXPORT_HPP_INC
diff --git a/thirdparty/assimp/include/assimp/GenericProperty.h b/thirdparty/assimp/include/assimp/GenericProperty.h
deleted file mode 100644
index 7796d595b8..0000000000
--- a/thirdparty/assimp/include/assimp/GenericProperty.h
+++ /dev/null
@@ -1,138 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-#pragma once
-#ifndef AI_GENERIC_PROPERTY_H_INCLUDED
-#define AI_GENERIC_PROPERTY_H_INCLUDED
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/Importer.hpp>
-#include <assimp/ai_assert.h>
-#include <assimp/Hash.h>
-
-#include <map>
-
-// ------------------------------------------------------------------------------------------------
-template <class T>
-inline
-bool SetGenericProperty(std::map< unsigned int, T >& list,
-        const char* szName, const T& value) {
-    ai_assert(nullptr != szName);
-    const uint32_t hash = SuperFastHash(szName);
-
-    typename std::map<unsigned int, T>::iterator it = list.find(hash);
-    if (it == list.end())   {
-        list.insert(std::pair<unsigned int, T>( hash, value ));
-        return false;
-    }
-    (*it).second = value;
-
-    return true;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <class T>
-inline
-const T& GetGenericProperty(const std::map< unsigned int, T >& list,
-        const char* szName, const T& errorReturn) {
-    ai_assert(nullptr != szName);
-    const uint32_t hash = SuperFastHash(szName);
-
-    typename std::map<unsigned int, T>::const_iterator it = list.find(hash);
-    if (it == list.end()) {
-        return errorReturn;
-    }
-
-    return (*it).second;
-}
-
-// ------------------------------------------------------------------------------------------------
-// Special version for pointer types - they will be deleted when replaced with another value
-// passing NULL removes the whole property
-template <class T>
-inline
-void SetGenericPropertyPtr(std::map< unsigned int, T* >& list,
-        const char* szName, T* value, bool* bWasExisting = nullptr ) {
-    ai_assert(nullptr != szName);
-    const uint32_t hash = SuperFastHash(szName);
-
-    typename std::map<unsigned int, T*>::iterator it = list.find(hash);
-    if (it == list.end())   {
-        if (bWasExisting) {
-            *bWasExisting = false;
-        }
-
-        list.insert(std::pair<unsigned int,T*>( hash, value ));
-        return;
-    }
-    if ((*it).second != value)  {
-        delete (*it).second;
-        (*it).second = value;
-    }
-    if (!value) {
-        list.erase(it);
-    }
-    if (bWasExisting) {
-        *bWasExisting = true;
-    }
-}
-
-// ------------------------------------------------------------------------------------------------
-template <class T>
-inline
-bool HasGenericProperty(const std::map< unsigned int, T >& list,
-        const char* szName) {
-    ai_assert(nullptr != szName);
-    const uint32_t hash = SuperFastHash(szName);
-
-    typename std::map<unsigned int, T>::const_iterator it = list.find(hash);
-    if (it == list.end()) {
-        return false;
-    }
-
-    return true;
-}
-
-#endif // !! AI_GENERIC_PROPERTY_H_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/Hash.h b/thirdparty/assimp/include/assimp/Hash.h
deleted file mode 100644
index 9056440789..0000000000
--- a/thirdparty/assimp/include/assimp/Hash.h
+++ /dev/null
@@ -1,122 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-#pragma once
-#ifndef AI_HASH_H_INCLUDED
-#define AI_HASH_H_INCLUDED
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <stdint.h>
-#include <string.h>
-
-// ------------------------------------------------------------------------------------------------
-// Hashing function taken from
-// http://www.azillionmonkeys.com/qed/hash.html
-// (incremental version)
-//
-// This code is Copyright 2004-2008 by Paul Hsieh. It is used here in the belief that
-// Assimp's license is considered compatible with Pauls's derivative license as specified
-// on his web page.
-//
-// (stdint.h should have been been included here)
-// ------------------------------------------------------------------------------------------------
-#undef get16bits
-#if (defined(__GNUC__) && defined(__i386__)) || defined(__WATCOMC__) \
-  || defined(_MSC_VER) || defined (__BORLANDC__) || defined (__TURBOC__)
-#define get16bits(d) (*((const uint16_t *) (d)))
-#endif
-
-#if !defined (get16bits)
-#define get16bits(d) ((((uint32_t)(((const uint8_t *)(d))[1])) << 8)\
-                       +(uint32_t)(((const uint8_t *)(d))[0]) )
-#endif
-
-// ------------------------------------------------------------------------------------------------
-inline uint32_t SuperFastHash (const char * data, uint32_t len = 0, uint32_t hash = 0) {
-uint32_t tmp;
-int rem;
-
-    if (!data) return 0;
-    if (!len)len = (uint32_t)::strlen(data);
-
-    rem = len & 3;
-    len >>= 2;
-
-    /* Main loop */
-    for (;len > 0; len--) {
-        hash  += get16bits (data);
-        tmp    = (get16bits (data+2) << 11) ^ hash;
-        hash   = (hash << 16) ^ tmp;
-        data  += 2*sizeof (uint16_t);
-        hash  += hash >> 11;
-    }
-
-    /* Handle end cases */
-    switch (rem) {
-        case 3: hash += get16bits (data);
-                hash ^= hash << 16;
-                hash ^= data[sizeof (uint16_t)] << 18;
-                hash += hash >> 11;
-                break;
-        case 2: hash += get16bits (data);
-                hash ^= hash << 11;
-                hash += hash >> 17;
-                break;
-        case 1: hash += *data;
-                hash ^= hash << 10;
-                hash += hash >> 1;
-    }
-
-    /* Force "avalanching" of final 127 bits */
-    hash ^= hash << 3;
-    hash += hash >> 5;
-    hash ^= hash << 4;
-    hash += hash >> 17;
-    hash ^= hash << 25;
-    hash += hash >> 6;
-
-    return hash;
-}
-
-#endif // !! AI_HASH_H_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/IOStream.hpp b/thirdparty/assimp/include/assimp/IOStream.hpp
deleted file mode 100644
index 39932cd949..0000000000
--- a/thirdparty/assimp/include/assimp/IOStream.hpp
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-/** @file IOStream.hpp
- *  @brief File I/O wrappers for C++.
- */
-
-#pragma once
-#ifndef AI_IOSTREAM_H_INC
-#define AI_IOSTREAM_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-
-#ifndef __cplusplus
-#   error This header requires C++ to be used. aiFileIO.h is the \
-    corresponding C interface.
-#endif
-
-namespace Assimp {
-
-// ----------------------------------------------------------------------------------
-/** @brief CPP-API: Class to handle file I/O for C++
- *
- *  Derive an own implementation from this interface to provide custom IO handling
- *  to the Importer. If you implement this interface, be sure to also provide an
- *  implementation for IOSystem that creates instances of your custom IO class.
-*/
-class ASSIMP_API IOStream
-#ifndef SWIG
-    : public Intern::AllocateFromAssimpHeap
-#endif
-{
-protected:
-    /** Constructor protected, use IOSystem::Open() to create an instance. */
-    IOStream() AI_NO_EXCEPT;
-
-public:
-    // -------------------------------------------------------------------
-    /** @brief Destructor. Deleting the object closes the underlying file,
-     * alternatively you may use IOSystem::Close() to release the file.
-     */
-    virtual ~IOStream();
-
-    // -------------------------------------------------------------------
-    /** @brief Read from the file
-     *
-     * See fread() for more details
-     * This fails for write-only files */
-    virtual size_t Read(void* pvBuffer,
-        size_t pSize,
-        size_t pCount) = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Write to the file
-    *
-    * See fwrite() for more details
-    * This fails for read-only files */
-    virtual size_t Write(const void* pvBuffer,
-        size_t pSize,
-        size_t pCount) = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Set the read/write cursor of the file
-     *
-     * Note that the offset is _negative_ for aiOrigin_END.
-     * See fseek() for more details */
-    virtual aiReturn Seek(size_t pOffset,
-        aiOrigin pOrigin) = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Get the current position of the read/write cursor
-     *
-     * See ftell() for more details */
-    virtual size_t Tell() const = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Returns filesize
-     *  Returns the filesize. */
-    virtual size_t FileSize() const = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Flush the contents of the file buffer (for writers)
-     *  See fflush() for more details.
-     */
-    virtual void Flush() = 0;
-}; //! class IOStream
-
-// ----------------------------------------------------------------------------------
-AI_FORCE_INLINE
-IOStream::IOStream() AI_NO_EXCEPT {
-    // empty
-}
-
-// ----------------------------------------------------------------------------------
-AI_FORCE_INLINE
-IOStream::~IOStream() {
-    // empty
-}
-// ----------------------------------------------------------------------------------
-
-} //!namespace Assimp
-
-#endif //!!AI_IOSTREAM_H_INC
diff --git a/thirdparty/assimp/include/assimp/IOStreamBuffer.h b/thirdparty/assimp/include/assimp/IOStreamBuffer.h
deleted file mode 100644
index 97c84b23e2..0000000000
--- a/thirdparty/assimp/include/assimp/IOStreamBuffer.h
+++ /dev/null
@@ -1,362 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-#pragma once
-#ifndef AI_IOSTREAMBUFFER_H_INC
-#define AI_IOSTREAMBUFFER_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-#include <assimp/IOStream.hpp>
-#include <assimp/ParsingUtils.h>
-
-#include <vector>
-
-namespace Assimp {
-
-// ---------------------------------------------------------------------------
-/**
- *  Implementation of a cached stream buffer.
- */
-template<class T>
-class IOStreamBuffer {
-public:
-    /// @brief  The class constructor.
-    IOStreamBuffer( size_t cache = 4096 * 4096 );
-
-    /// @brief  The class destructor.
-    ~IOStreamBuffer();
-
-    /// @brief  Will open the cached access for a given stream.
-    /// @param  stream      The stream to cache.
-    /// @return true if successful.
-    bool open( IOStream *stream );
-
-    /// @brief  Will close the cached access.
-    /// @return true if successful.
-    bool close();
-
-    /// @brief  Returns the file-size.
-    /// @return The file-size.
-    size_t size() const;
-    
-    /// @brief  Returns the cache size.
-    /// @return The cache size.
-    size_t cacheSize() const;
-
-    /// @brief  Will read the next block.
-    /// @return true if successful.
-    bool readNextBlock();
-
-    /// @brief  Returns the number of blocks to read.
-    /// @return The number of blocks.
-    size_t getNumBlocks() const;
-
-    /// @brief  Returns the current block index.
-    /// @return The current block index.
-    size_t getCurrentBlockIndex() const;
-
-    /// @brief  Returns the current file pos.
-    /// @return The current file pos.
-    size_t getFilePos() const;
-
-    /// @brief  Will read the next line.
-    /// @param  buffer      The buffer for the next line.
-    /// @return true if successful.
-    bool getNextDataLine( std::vector<T> &buffer, T continuationToken );
-
-    /// @brief  Will read the next line ascii or binary end line char.
-    /// @param  buffer      The buffer for the next line.
-    /// @return true if successful.
-    bool getNextLine(std::vector<T> &buffer);
-
-    /// @brief  Will read the next block.
-    /// @param  buffer      The buffer for the next block.
-    /// @return true if successful.
-    bool getNextBlock( std::vector<T> &buffer );
-
-private:
-    IOStream *m_stream;
-    size_t m_filesize;
-    size_t m_cacheSize;
-    size_t m_numBlocks;
-    size_t m_blockIdx;
-    std::vector<T> m_cache;
-    size_t m_cachePos;
-    size_t m_filePos;
-};
-
-template<class T>
-AI_FORCE_INLINE
-IOStreamBuffer<T>::IOStreamBuffer( size_t cache )
-: m_stream( nullptr )
-, m_filesize( 0 )
-, m_cacheSize( cache )
-, m_numBlocks( 0 )
-, m_blockIdx( 0 )
-, m_cachePos( 0 )
-, m_filePos( 0 ) {
-    m_cache.resize( cache );
-    std::fill( m_cache.begin(), m_cache.end(), '\n' );
-}
-
-template<class T>
-AI_FORCE_INLINE
-IOStreamBuffer<T>::~IOStreamBuffer() {
-    // empty
-}
-
-template<class T>
-AI_FORCE_INLINE
-bool IOStreamBuffer<T>::open( IOStream *stream ) {
-    //  file still opened!
-    if ( nullptr != m_stream ) {
-        return false;
-    }
-
-    //  Invalid stream pointer
-    if ( nullptr == stream ) {
-        return false;
-    }
-
-    m_stream = stream;
-    m_filesize = m_stream->FileSize();
-    if ( m_filesize == 0 ) {
-        return false;
-    }
-    if ( m_filesize < m_cacheSize ) {
-        m_cacheSize = m_filesize;
-    }
-
-    m_numBlocks = m_filesize / m_cacheSize;
-    if ( ( m_filesize % m_cacheSize ) > 0 ) {
-        m_numBlocks++;
-    }
-
-    return true;
-}
-
-template<class T>
-AI_FORCE_INLINE
-bool IOStreamBuffer<T>::close() {
-    if ( nullptr == m_stream ) {
-        return false;
-    }
-
-    // init counters and state vars
-    m_stream    = nullptr;
-    m_filesize  = 0;
-    m_numBlocks = 0;
-    m_blockIdx  = 0;
-    m_cachePos  = 0;
-    m_filePos   = 0;
-
-    return true;
-}
-
-template<class T>
-AI_FORCE_INLINE
-size_t IOStreamBuffer<T>::size() const {
-    return m_filesize;
-}
-
-template<class T>
-AI_FORCE_INLINE
-size_t IOStreamBuffer<T>::cacheSize() const {
-    return m_cacheSize;
-}
-
-template<class T>
-AI_FORCE_INLINE
-bool IOStreamBuffer<T>::readNextBlock() {
-    m_stream->Seek( m_filePos, aiOrigin_SET );
-    size_t readLen = m_stream->Read( &m_cache[ 0 ], sizeof( T ), m_cacheSize );
-    if ( readLen == 0 ) {
-        return false;
-    }
-    if ( readLen < m_cacheSize ) {
-        m_cacheSize = readLen;
-    }
-    m_filePos += m_cacheSize;
-    m_cachePos = 0;
-    m_blockIdx++;
-
-    return true;
-}
-
-template<class T>
-AI_FORCE_INLINE
-size_t IOStreamBuffer<T>::getNumBlocks() const {
-    return m_numBlocks;
-}
-
-template<class T>
-AI_FORCE_INLINE
-size_t IOStreamBuffer<T>::getCurrentBlockIndex() const {
-    return m_blockIdx;
-}
-
-template<class T>
-AI_FORCE_INLINE
-size_t IOStreamBuffer<T>::getFilePos() const {
-    return m_filePos;
-}
-
-template<class T>
-AI_FORCE_INLINE
-bool IOStreamBuffer<T>::getNextDataLine( std::vector<T> &buffer, T continuationToken ) {
-    buffer.resize( m_cacheSize );
-    if ( m_cachePos >= m_cacheSize || 0 == m_filePos ) {
-        if ( !readNextBlock() ) {
-            return false;
-        }
-    }
-
-    bool continuationFound( false );
-    size_t i = 0;
-    for( ;; ) {
-        if ( continuationToken == m_cache[ m_cachePos ] ) {
-            continuationFound = true;
-            ++m_cachePos;
-        }
-        if ( IsLineEnd( m_cache[ m_cachePos ] ) ) {
-            if ( !continuationFound ) {
-                // the end of the data line
-                break;
-            } else {
-                // skip line end
-                while ( m_cache[m_cachePos] != '\n') {
-                    ++m_cachePos;
-                }
-                ++m_cachePos;
-                continuationFound = false;
-            }
-        }
-
-        buffer[ i ] = m_cache[ m_cachePos ];
-        ++m_cachePos;
-        ++i;
-        if (m_cachePos >= size()) {
-            break;
-        }
-        if ( m_cachePos >= m_cacheSize ) {
-            if ( !readNextBlock() ) {
-                return false;
-            }
-        }
-    }
-    
-    buffer[ i ] = '\n';
-    ++m_cachePos;
-
-    return true;
-}
-
-static AI_FORCE_INLINE
-bool isEndOfCache( size_t pos, size_t cacheSize ) {
-    return ( pos == cacheSize );
-}
-
-template<class T>
-AI_FORCE_INLINE
-bool IOStreamBuffer<T>::getNextLine(std::vector<T> &buffer) {
-    buffer.resize(m_cacheSize);
-    if ( isEndOfCache( m_cachePos, m_cacheSize ) || 0 == m_filePos) {
-       if (!readNextBlock()) {
-          return false;
-       }
-      }
-
-    if (IsLineEnd(m_cache[m_cachePos])) {
-        // skip line end
-        while (m_cache[m_cachePos] != '\n') {
-            ++m_cachePos;
-        }
-        ++m_cachePos;
-        if ( isEndOfCache( m_cachePos, m_cacheSize ) ) {
-            if ( !readNextBlock() ) {
-                return false;
-            }
-        }
-    }
-
-    size_t i( 0 );
-    while (!IsLineEnd(m_cache[ m_cachePos ])) {
-        buffer[i] = m_cache[ m_cachePos ];
-        ++m_cachePos;
-        ++i;
-        if (m_cachePos >= m_cacheSize) {
-            if (!readNextBlock()) {
-                return false;
-            }
-        }
-    }
-    buffer[i] = '\n';
-    ++m_cachePos;
-
-    return true;
-}
-
-template<class T>
-AI_FORCE_INLINE
-bool IOStreamBuffer<T>::getNextBlock( std::vector<T> &buffer) {
-    // Return the last block-value if getNextLine was used before
-    if ( 0 != m_cachePos ) {      
-        buffer = std::vector<T>( m_cache.begin() + m_cachePos, m_cache.end() );
-        m_cachePos = 0;
-    } else {
-        if ( !readNextBlock() ) {
-            return false;
-        }
-
-        buffer = std::vector<T>(m_cache.begin(), m_cache.end());
-    }
-
-    return true;
-}
-
-} // !ns Assimp
-
-#endif // AI_IOSTREAMBUFFER_H_INC
diff --git a/thirdparty/assimp/include/assimp/IOSystem.hpp b/thirdparty/assimp/include/assimp/IOSystem.hpp
deleted file mode 100644
index f1fb3b0c27..0000000000
--- a/thirdparty/assimp/include/assimp/IOSystem.hpp
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file IOSystem.hpp
- *  @brief File system wrapper for C++. Inherit this class to supply
- *  custom file handling logic to the Import library.
-*/
-
-#pragma once
-#ifndef AI_IOSYSTEM_H_INC
-#define AI_IOSYSTEM_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifndef __cplusplus
-#   error This header requires C++ to be used. aiFileIO.h is the \
-    corresponding C interface.
-#endif
-
-#include "types.h"
-
-#ifdef _WIN32
-#   include <direct.h>  
-#   include <stdlib.h>  
-#   include <stdio.h>  
-#else
-#   include <sys/stat.h>
-#   include <sys/types.h>
-#   include <unistd.h>
-#endif // _WIN32
-
-#include <vector>
-
-namespace Assimp    {
-
-    class IOStream;
-
-// ---------------------------------------------------------------------------
-/** @brief CPP-API: Interface to the file system.
- *
- *  Derive an own implementation from this interface to supply custom file handling
- *  to the importer library. If you implement this interface, you also want to
- *  supply a custom implementation for IOStream.
- *
- *  @see Importer::SetIOHandler() 
- */
-class ASSIMP_API IOSystem
-#ifndef SWIG
-    : public Intern::AllocateFromAssimpHeap
-#endif
-{
-public:
-
-    // -------------------------------------------------------------------
-    /** @brief Default constructor.
-     *
-     *  Create an instance of your derived class and assign it to an
-     *  #Assimp::Importer instance by calling Importer::SetIOHandler().
-     */
-    IOSystem() AI_NO_EXCEPT;
-
-    // -------------------------------------------------------------------
-    /** @brief Virtual destructor.
-     *
-     *  It is safe to be called from within DLL Assimp, we're constructed
-     *  on Assimp's heap.
-     */
-    virtual ~IOSystem();
-
-    // -------------------------------------------------------------------
-    /** @brief For backward compatibility
-     *  @see Exists(const char*)
-     */
-    AI_FORCE_INLINE bool Exists( const std::string& pFile) const;
-
-    // -------------------------------------------------------------------
-    /** @brief Tests for the existence of a file at the given path.
-     *
-     * @param pFile Path to the file
-     * @return true if there is a file with this path, else false.
-     */
-    virtual bool Exists( const char* pFile) const = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Returns the system specific directory separator
-     *  @return System specific directory separator
-     */
-    virtual char getOsSeparator() const = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Open a new file with a given path.
-     *
-     *  When the access to the file is finished, call Close() to release
-     *  all associated resources (or the virtual dtor of the IOStream).
-     *
-     *  @param pFile Path to the file
-     *  @param pMode Desired file I/O mode. Required are: "wb", "w", "wt",
-     *         "rb", "r", "rt".
-     *
-     *  @return New IOStream interface allowing the lib to access
-     *         the underlying file.
-     *  @note When implementing this class to provide custom IO handling,
-     *  you probably have to supply an own implementation of IOStream as well.
-     */
-    virtual IOStream* Open(const char* pFile,
-        const char* pMode = "rb") = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief For backward compatibility
-     *  @see Open(const char*, const char*)
-     */
-    inline IOStream* Open(const std::string& pFile,
-        const std::string& pMode = std::string("rb"));
-
-    // -------------------------------------------------------------------
-    /** @brief Closes the given file and releases all resources
-     *    associated with it.
-     *  @param pFile The file instance previously created by Open().
-     */
-    virtual void Close( IOStream* pFile) = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Compares two paths and check whether the point to
-     *         identical files.
-     *
-     * The dummy implementation of this virtual member performs a
-     * case-insensitive comparison of the given strings. The default IO
-     * system implementation uses OS mechanisms to convert relative into
-     * absolute paths, so the result can be trusted.
-     * @param one First file
-     * @param second Second file
-     * @return true if the paths point to the same file. The file needn't
-     *   be existing, however.
-     */
-    virtual bool ComparePaths (const char* one,
-        const char* second) const;
-
-    // -------------------------------------------------------------------
-    /** @brief For backward compatibility
-     *  @see ComparePaths(const char*, const char*)
-     */
-    inline bool ComparePaths (const std::string& one,
-        const std::string& second) const;
-
-    // -------------------------------------------------------------------
-    /** @brief Pushes a new directory onto the directory stack.
-     *  @param path Path to push onto the stack.
-     *  @return True, when push was successful, false if path is empty.
-     */
-    virtual bool PushDirectory( const std::string &path );
-
-    // -------------------------------------------------------------------
-    /** @brief Returns the top directory from the stack.
-     *  @return The directory on the top of the stack.
-     *          Returns empty when no directory was pushed to the stack.
-     */
-    virtual const std::string &CurrentDirectory() const;
-
-    // -------------------------------------------------------------------
-    /** @brief Returns the number of directories stored on the stack.
-     *  @return The number of directories of the stack.
-     */
-    virtual size_t StackSize() const;
-
-    // -------------------------------------------------------------------
-    /** @brief Pops the top directory from the stack.
-     *  @return True, when a directory was on the stack. False if no
-     *          directory was on the stack.
-     */
-    virtual bool PopDirectory();
-
-    // -------------------------------------------------------------------
-    /** @brief CReates an new directory at the given path.
-     *  @param  path    [in] The path to create.
-     *  @return True, when a directory was created. False if the directory
-     *           cannot be created.
-     */
-    virtual bool CreateDirectory( const std::string &path );
-
-    // -------------------------------------------------------------------
-    /** @brief Will change the current directory to the given path.
-     *  @param path     [in] The path to change to.
-     *  @return True, when the directory has changed successfully.
-     */
-    virtual bool ChangeDirectory( const std::string &path );
-
-    virtual bool DeleteFile( const std::string &file );
-
-private:
-    std::vector<std::string> m_pathStack;
-};
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-IOSystem::IOSystem() AI_NO_EXCEPT
-: m_pathStack() {
-    // empty
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-IOSystem::~IOSystem() {
-    // empty
-}
-
-// ----------------------------------------------------------------------------
-// For compatibility, the interface of some functions taking a std::string was
-// changed to const char* to avoid crashes between binary incompatible STL
-// versions. This code her is inlined,  so it shouldn't cause any problems.
-// ----------------------------------------------------------------------------
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-IOStream* IOSystem::Open(const std::string& pFile, const std::string& pMode) {
-    // NOTE:
-    // For compatibility, interface was changed to const char* to
-    // avoid crashes between binary incompatible STL versions
-    return Open(pFile.c_str(),pMode.c_str());
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-bool IOSystem::Exists( const std::string& pFile) const {
-    // NOTE:
-    // For compatibility, interface was changed to const char* to
-    // avoid crashes between binary incompatible STL versions
-    return Exists(pFile.c_str());
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-bool IOSystem::ComparePaths (const std::string& one, const std::string& second) const {
-    // NOTE:
-    // For compatibility, interface was changed to const char* to
-    // avoid crashes between binary incompatible STL versions
-    return ComparePaths(one.c_str(),second.c_str());
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-bool IOSystem::PushDirectory( const std::string &path ) {
-    if ( path.empty() ) {
-        return false;
-    }
-
-    m_pathStack.push_back( path );
-
-    return true;
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-const std::string &IOSystem::CurrentDirectory() const {
-    if ( m_pathStack.empty() ) {
-        static const std::string Dummy("");
-        return Dummy;
-    }
-    return m_pathStack[ m_pathStack.size()-1 ];
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-size_t IOSystem::StackSize() const {
-    return m_pathStack.size();
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-bool IOSystem::PopDirectory() {
-    if ( m_pathStack.empty() ) {
-        return false;
-    }
-
-    m_pathStack.pop_back();
-
-    return true;
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-bool IOSystem::CreateDirectory( const std::string &path ) {
-    if ( path.empty() ) {
-        return false;
-    }
-
-#ifdef _WIN32
-    return 0 != ::_mkdir( path.c_str() );
-#else
-    return 0 != ::mkdir( path.c_str(), 0777 );
-#endif // _WIN32
-}
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-bool IOSystem::ChangeDirectory( const std::string &path ) {
-    if ( path.empty() ) {
-        return false;
-    }
-
-#ifdef _WIN32
-    return 0 != ::_chdir( path.c_str() );
-#else
-    return 0 != ::chdir( path.c_str() );
-#endif // _WIN32
-}
-
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE
-bool IOSystem::DeleteFile( const std::string &file ) {
-    if ( file.empty() ) {
-        return false;
-    }
-    const int retCode( ::remove( file.c_str() ) );
-    return ( 0 == retCode );
-}
-} //!ns Assimp
-
-#endif //AI_IOSYSTEM_H_INC
diff --git a/thirdparty/assimp/include/assimp/Importer.hpp b/thirdparty/assimp/include/assimp/Importer.hpp
deleted file mode 100644
index bf449a9a25..0000000000
--- a/thirdparty/assimp/include/assimp/Importer.hpp
+++ /dev/null
@@ -1,663 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  Importer.hpp
- *  @brief Defines the C++-API to the Open Asset Import Library.
- */
-#pragma once
-#ifndef AI_ASSIMP_HPP_INC
-#define AI_ASSIMP_HPP_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifndef __cplusplus
-#   error This header requires C++ to be used. Use assimp.h for plain C.
-#endif // __cplusplus
-
-// Public ASSIMP data structures
-#include <assimp/types.h>
-
-namespace Assimp    {
-    // =======================================================================
-    // Public interface to Assimp
-    class Importer;
-    class IOStream;
-    class IOSystem;
-    class ProgressHandler;
-
-    // =======================================================================
-    // Plugin development
-    //
-    // Include the following headers for the declarations:
-    // BaseImporter.h
-    // BaseProcess.h
-    class BaseImporter;
-    class BaseProcess;
-    class SharedPostProcessInfo;
-    class BatchLoader;
-
-    // =======================================================================
-    // Holy stuff, only for members of the high council of the Jedi.
-    class ImporterPimpl;
-} //! namespace Assimp
-
-#define AI_PROPERTY_WAS_NOT_EXISTING 0xffffffff
-
-struct aiScene;
-
-// importerdesc.h
-struct aiImporterDesc;
-
-/** @namespace Assimp Assimp's CPP-API and all internal APIs */
-namespace Assimp    {
-
-// ----------------------------------------------------------------------------------
-/** CPP-API: The Importer class forms an C++ interface to the functionality of the
-*   Open Asset Import Library.
-*
-* Create an object of this class and call ReadFile() to import a file.
-* If the import succeeds, the function returns a pointer to the imported data.
-* The data remains property of the object, it is intended to be accessed
-* read-only. The imported data will be destroyed along with the Importer
-* object. If the import fails, ReadFile() returns a NULL pointer. In this
-* case you can retrieve a human-readable error description be calling
-* GetErrorString(). You can call ReadFile() multiple times with a single Importer
-* instance. Actually, constructing Importer objects involves quite many
-* allocations and may take some time, so it's better to reuse them as often as
-* possible.
-*
-* If you need the Importer to do custom file handling to access the files,
-* implement IOSystem and IOStream and supply an instance of your custom
-* IOSystem implementation by calling SetIOHandler() before calling ReadFile().
-* If you do not assign a custion IO handler, a default handler using the
-* standard C++ IO logic will be used.
-*
-* @note One Importer instance is not thread-safe. If you use multiple
-* threads for loading, each thread should maintain its own Importer instance.
-*/
-class ASSIMP_API Importer   {
-public:
-    /**
-     *  @brief The upper limit for hints.
-     */
-    static const unsigned int MaxLenHint = 200;
-
-public:
-
-    // -------------------------------------------------------------------
-    /** Constructor. Creates an empty importer object.
-     *
-     * Call ReadFile() to start the import process. The configuration
-     * property table is initially empty.
-     */
-    Importer();
-
-    // -------------------------------------------------------------------
-    /** Copy constructor.
-     *
-     * This copies the configuration properties of another Importer.
-     * If this Importer owns a scene it won't be copied.
-     * Call ReadFile() to start the import process.
-     */
-    Importer(const Importer& other)=delete;
-
-    // -------------------------------------------------------------------
-    /** Assignment operator has been deleted
-     */
-    Importer &operator=(const Importer &) = delete;
-
-    // -------------------------------------------------------------------
-    /** Destructor. The object kept ownership of the imported data,
-     * which now will be destroyed along with the object.
-     */
-    ~Importer();
-
-
-    // -------------------------------------------------------------------
-    /** Registers a new loader.
-     *
-     * @param pImp Importer to be added. The Importer instance takes
-     *   ownership of the pointer, so it will be automatically deleted
-     *   with the Importer instance.
-     * @return AI_SUCCESS if the loader has been added. The registration
-     *   fails if there is already a loader for a specific file extension.
-     */
-    aiReturn RegisterLoader(BaseImporter* pImp);
-
-    // -------------------------------------------------------------------
-    /** Unregisters a loader.
-     *
-     * @param pImp Importer to be unregistered.
-     * @return AI_SUCCESS if the loader has been removed. The function
-     *   fails if the loader is currently in use (this could happen
-     *   if the #Importer instance is used by more than one thread) or
-     *   if it has not yet been registered.
-     */
-    aiReturn UnregisterLoader(BaseImporter* pImp);
-
-    // -------------------------------------------------------------------
-    /** Registers a new post-process step.
-     *
-     * At the moment, there's a small limitation: new post processing
-     * steps are added to end of the list, or in other words, executed
-     * last, after all built-in steps.
-     * @param pImp Post-process step to be added. The Importer instance
-     *   takes ownership of the pointer, so it will be automatically
-     *   deleted with the Importer instance.
-     * @return AI_SUCCESS if the step has been added correctly.
-     */
-    aiReturn RegisterPPStep(BaseProcess* pImp);
-
-    // -------------------------------------------------------------------
-    /** Unregisters a post-process step.
-     *
-     * @param pImp Step to be unregistered.
-     * @return AI_SUCCESS if the step has been removed. The function
-     *   fails if the step is currently in use (this could happen
-     *   if the #Importer instance is used by more than one thread) or
-     *   if it has not yet been registered.
-     */
-    aiReturn UnregisterPPStep(BaseProcess* pImp);
-
-    // -------------------------------------------------------------------
-    /** Set an integer configuration property.
-     * @param szName Name of the property. All supported properties
-     *   are defined in the aiConfig.g header (all constants share the
-     *   prefix AI_CONFIG_XXX and are simple strings).
-     * @param iValue New value of the property
-     * @return true if the property was set before. The new value replaces
-     *   the previous value in this case.
-     * @note Property of different types (float, int, string ..) are kept
-     *   on different stacks, so calling SetPropertyInteger() for a
-     *   floating-point property has no effect - the loader will call
-     *   GetPropertyFloat() to read the property, but it won't be there.
-     */
-    bool SetPropertyInteger(const char* szName, int iValue);
-
-    // -------------------------------------------------------------------
-    /** Set a boolean configuration property. Boolean properties
-     *  are stored on the integer stack internally so it's possible
-     *  to set them via #SetPropertyBool and query them with
-     *  #GetPropertyBool and vice versa.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyBool(const char* szName, bool value)    {
-        return SetPropertyInteger(szName,value);
-    }
-
-    // -------------------------------------------------------------------
-    /** Set a floating-point configuration property.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyFloat(const char* szName, ai_real fValue);
-
-    // -------------------------------------------------------------------
-    /** Set a string configuration property.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyString(const char* szName, const std::string& sValue);
-
-    // -------------------------------------------------------------------
-    /** Set a matrix configuration property.
-     * @see SetPropertyInteger()
-     */
-    bool SetPropertyMatrix(const char* szName, const aiMatrix4x4& sValue);
-
-    // -------------------------------------------------------------------
-    /** Get a configuration property.
-     * @param szName Name of the property. All supported properties
-     *   are defined in the aiConfig.g header (all constants share the
-     *   prefix AI_CONFIG_XXX).
-     * @param iErrorReturn Value that is returned if the property
-     *   is not found.
-     * @return Current value of the property
-     * @note Property of different types (float, int, string ..) are kept
-     *   on different lists, so calling SetPropertyInteger() for a
-     *   floating-point property has no effect - the loader will call
-     *   GetPropertyFloat() to read the property, but it won't be there.
-     */
-    int GetPropertyInteger(const char* szName,
-        int iErrorReturn = 0xffffffff) const;
-
-    // -------------------------------------------------------------------
-    /** Get a boolean configuration property. Boolean properties
-     *  are stored on the integer stack internally so it's possible
-     *  to set them via #SetPropertyBool and query them with
-     *  #GetPropertyBool and vice versa.
-     * @see GetPropertyInteger()
-     */
-    bool GetPropertyBool(const char* szName, bool bErrorReturn = false) const {
-        return GetPropertyInteger(szName,bErrorReturn)!=0;
-    }
-
-    // -------------------------------------------------------------------
-    /** Get a floating-point configuration property
-     * @see GetPropertyInteger()
-     */
-    ai_real GetPropertyFloat(const char* szName,
-        ai_real fErrorReturn = 10e10) const;
-
-    // -------------------------------------------------------------------
-    /** Get a string configuration property
-     *
-     *  The return value remains valid until the property is modified.
-     * @see GetPropertyInteger()
-     */
-    const std::string GetPropertyString(const char* szName,
-        const std::string& sErrorReturn = "") const;
-
-    // -------------------------------------------------------------------
-    /** Get a matrix configuration property
-     *
-     *  The return value remains valid until the property is modified.
-     * @see GetPropertyInteger()
-     */
-    const aiMatrix4x4 GetPropertyMatrix(const char* szName,
-        const aiMatrix4x4& sErrorReturn = aiMatrix4x4()) const;
-
-    // -------------------------------------------------------------------
-    /** Supplies a custom IO handler to the importer to use to open and
-     * access files. If you need the importer to use custom IO logic to
-     * access the files, you need to provide a custom implementation of
-     * IOSystem and IOFile to the importer. Then create an instance of
-     * your custom IOSystem implementation and supply it by this function.
-     *
-     * The Importer takes ownership of the object and will destroy it
-     * afterwards. The previously assigned handler will be deleted.
-     * Pass NULL to take again ownership of your IOSystem and reset Assimp
-     * to use its default implementation.
-     *
-     * @param pIOHandler The IO handler to be used in all file accesses
-     *   of the Importer.
-     */
-    void SetIOHandler( IOSystem* pIOHandler);
-
-    // -------------------------------------------------------------------
-    /** Retrieves the IO handler that is currently set.
-     * You can use #IsDefaultIOHandler() to check whether the returned
-     * interface is the default IO handler provided by ASSIMP. The default
-     * handler is active as long the application doesn't supply its own
-     * custom IO handler via #SetIOHandler().
-     * @return A valid IOSystem interface, never NULL.
-     */
-    IOSystem* GetIOHandler() const;
-
-    // -------------------------------------------------------------------
-    /** Checks whether a default IO handler is active
-     * A default handler is active as long the application doesn't
-     * supply its own custom IO handler via #SetIOHandler().
-     * @return true by default
-     */
-    bool IsDefaultIOHandler() const;
-
-    // -------------------------------------------------------------------
-    /** Supplies a custom progress handler to the importer. This
-     *  interface exposes an #Update() callback, which is called
-     *  more or less periodically (please don't sue us if it
-     *  isn't as periodically as you'd like it to have ...).
-     *  This can be used to implement progress bars and loading
-     *  timeouts.
-     *  @param pHandler Progress callback interface. Pass NULL to
-     *    disable progress reporting.
-     *  @note Progress handlers can be used to abort the loading
-     *    at almost any time.*/
-    void SetProgressHandler ( ProgressHandler* pHandler );
-
-    // -------------------------------------------------------------------
-    /** Retrieves the progress handler that is currently set.
-     * You can use #IsDefaultProgressHandler() to check whether the returned
-     * interface is the default handler provided by ASSIMP. The default
-     * handler is active as long the application doesn't supply its own
-     * custom handler via #SetProgressHandler().
-     * @return A valid ProgressHandler interface, never NULL.
-     */
-    ProgressHandler* GetProgressHandler() const;
-
-    // -------------------------------------------------------------------
-    /** Checks whether a default progress handler is active
-     * A default handler is active as long the application doesn't
-     * supply its own custom progress handler via #SetProgressHandler().
-     * @return true by default
-     */
-    bool IsDefaultProgressHandler() const;
-
-    // -------------------------------------------------------------------
-    /** @brief Check whether a given set of post-processing flags
-     *  is supported.
-     *
-     *  Some flags are mutually exclusive, others are probably
-     *  not available because your excluded them from your
-     *  Assimp builds. Calling this function is recommended if
-     *  you're unsure.
-     *
-     *  @param pFlags Bitwise combination of the aiPostProcess flags.
-     *  @return true if this flag combination is fine.
-     */
-    bool ValidateFlags(unsigned int pFlags) const;
-
-    // -------------------------------------------------------------------
-    /** Reads the given file and returns its contents if successful.
-     *
-     * If the call succeeds, the contents of the file are returned as a
-     * pointer to an aiScene object. The returned data is intended to be
-     * read-only, the importer object keeps ownership of the data and will
-     * destroy it upon destruction. If the import fails, NULL is returned.
-     * A human-readable error description can be retrieved by calling
-     * GetErrorString(). The previous scene will be deleted during this call.
-     * @param pFile Path and filename to the file to be imported.
-     * @param pFlags Optional post processing steps to be executed after
-     *   a successful import. Provide a bitwise combination of the
-     *   #aiPostProcessSteps flags. If you wish to inspect the imported
-     *   scene first in order to fine-tune your post-processing setup,
-     *   consider to use #ApplyPostProcessing().
-     * @return A pointer to the imported data, NULL if the import failed.
-     *   The pointer to the scene remains in possession of the Importer
-     *   instance. Use GetOrphanedScene() to take ownership of it.
-     *
-     * @note Assimp is able to determine the file format of a file
-     * automatically.
-     */
-    const aiScene* ReadFile(
-        const char* pFile,
-        unsigned int pFlags);
-
-    // -------------------------------------------------------------------
-    /** Reads the given file from a memory buffer and returns its
-     *  contents if successful.
-     *
-     * If the call succeeds, the contents of the file are returned as a
-     * pointer to an aiScene object. The returned data is intended to be
-     * read-only, the importer object keeps ownership of the data and will
-     * destroy it upon destruction. If the import fails, NULL is returned.
-     * A human-readable error description can be retrieved by calling
-     * GetErrorString(). The previous scene will be deleted during this call.
-     * Calling this method doesn't affect the active IOSystem.
-     * @param pBuffer Pointer to the file data
-     * @param pLength Length of pBuffer, in bytes
-     * @param pFlags Optional post processing steps to be executed after
-     *   a successful import. Provide a bitwise combination of the
-     *   #aiPostProcessSteps flags. If you wish to inspect the imported
-     *   scene first in order to fine-tune your post-processing setup,
-     *   consider to use #ApplyPostProcessing().
-     * @param pHint An additional hint to the library. If this is a non
-     *   empty string, the library looks for a loader to support
-     *   the file extension specified by pHint and passes the file to
-     *   the first matching loader. If this loader is unable to completely
-     *   the request, the library continues and tries to determine the
-     *   file format on its own, a task that may or may not be successful.
-     *   Check the return value, and you'll know ...
-     * @return A pointer to the imported data, NULL if the import failed.
-     *   The pointer to the scene remains in possession of the Importer
-     *   instance. Use GetOrphanedScene() to take ownership of it.
-     *
-     * @note This is a straightforward way to decode models from memory
-     * buffers, but it doesn't handle model formats that spread their
-     * data across multiple files or even directories. Examples include
-     * OBJ or MD3, which outsource parts of their material info into
-     * external scripts. If you need full functionality, provide
-     * a custom IOSystem to make Assimp find these files and use
-     * the regular ReadFile() API.
-     */
-    const aiScene* ReadFileFromMemory(
-        const void* pBuffer,
-        size_t pLength,
-        unsigned int pFlags,
-        const char* pHint = "");
-
-    // -------------------------------------------------------------------
-    /** Apply post-processing to an already-imported scene.
-     *
-     *  This is strictly equivalent to calling #ReadFile() with the same
-     *  flags. However, you can use this separate function to inspect
-     *  the imported scene first to fine-tune your post-processing setup.
-     *  @param pFlags Provide a bitwise combination of the
-     *   #aiPostProcessSteps flags.
-     *  @return A pointer to the post-processed data. This is still the
-     *   same as the pointer returned by #ReadFile(). However, if
-     *   post-processing fails, the scene could now be NULL.
-     *   That's quite a rare case, post processing steps are not really
-     *   designed to 'fail'. To be exact, the #aiProcess_ValidateDS
-     *   flag is currently the only post processing step which can actually
-     *   cause the scene to be reset to NULL.
-     *
-     *  @note The method does nothing if no scene is currently bound
-     *    to the #Importer instance.  */
-    const aiScene* ApplyPostProcessing(unsigned int pFlags);
-
-    const aiScene* ApplyCustomizedPostProcessing( BaseProcess *rootProcess, bool requestValidation );
-
-    // -------------------------------------------------------------------
-    /** @brief Reads the given file and returns its contents if successful.
-     *
-     * This function is provided for backward compatibility.
-     * See the const char* version for detailed docs.
-     * @see ReadFile(const char*, pFlags)  */
-    const aiScene* ReadFile(
-        const std::string& pFile,
-        unsigned int pFlags);
-
-    // -------------------------------------------------------------------
-    /** Frees the current scene.
-     *
-     *  The function does nothing if no scene has previously been
-     *  read via ReadFile(). FreeScene() is called automatically by the
-     *  destructor and ReadFile() itself.  */
-    void FreeScene( );
-
-    // -------------------------------------------------------------------
-    /** Returns an error description of an error that occurred in ReadFile().
-     *
-     * Returns an empty string if no error occurred.
-     * @return A description of the last error, an empty string if no
-     *   error occurred. The string is never NULL.
-     *
-     * @note The returned function remains valid until one of the
-     * following methods is called: #ReadFile(), #FreeScene(). */
-    const char* GetErrorString() const;
-
-    // -------------------------------------------------------------------
-    /** Returns the scene loaded by the last successful call to ReadFile()
-     *
-     * @return Current scene or NULL if there is currently no scene loaded */
-    const aiScene* GetScene() const;
-
-    // -------------------------------------------------------------------
-    /** Returns the scene loaded by the last successful call to ReadFile()
-     *  and releases the scene from the ownership of the Importer
-     *  instance. The application is now responsible for deleting the
-     *  scene. Any further calls to GetScene() or GetOrphanedScene()
-     *  will return NULL - until a new scene has been loaded via ReadFile().
-     *
-     * @return Current scene or NULL if there is currently no scene loaded
-     * @note Use this method with maximal caution, and only if you have to.
-     *   By design, aiScene's are exclusively maintained, allocated and
-     *   deallocated by Assimp and no one else. The reasoning behind this
-     *   is the golden rule that deallocations should always be done
-     *   by the module that did the original allocation because heaps
-     *   are not necessarily shared. GetOrphanedScene() enforces you
-     *   to delete the returned scene by yourself, but this will only
-     *   be fine if and only if you're using the same heap as assimp.
-     *   On Windows, it's typically fine provided everything is linked
-     *   against the multithreaded-dll version of the runtime library.
-     *   It will work as well for static linkage with Assimp.*/
-    aiScene* GetOrphanedScene();
-
-    // -------------------------------------------------------------------
-    /** Returns whether a given file extension is supported by ASSIMP.
-     *
-     * @param szExtension Extension to be checked.
-     *   Must include a trailing dot '.'. Example: ".3ds", ".md3".
-     *   Cases-insensitive.
-     * @return true if the extension is supported, false otherwise */
-    bool IsExtensionSupported(const char* szExtension) const;
-
-    // -------------------------------------------------------------------
-    /** @brief Returns whether a given file extension is supported by ASSIMP.
-     *
-     * This function is provided for backward compatibility.
-     * See the const char* version for detailed and up-to-date docs.
-     * @see IsExtensionSupported(const char*) */
-    inline bool IsExtensionSupported(const std::string& szExtension) const;
-
-    // -------------------------------------------------------------------
-    /** Get a full list of all file extensions supported by ASSIMP.
-     *
-     * If a file extension is contained in the list this does of course not
-     * mean that ASSIMP is able to load all files with this extension ---
-     * it simply means there is an importer loaded which claims to handle
-     * files with this file extension.
-     * @param szOut String to receive the extension list.
-     *   Format of the list: "*.3ds;*.obj;*.dae". This is useful for
-     *   use with the WinAPI call GetOpenFileName(Ex). */
-    void GetExtensionList(aiString& szOut) const;
-
-    // -------------------------------------------------------------------
-    /** @brief Get a full list of all file extensions supported by ASSIMP.
-     *
-     * This function is provided for backward compatibility.
-     * See the aiString version for detailed and up-to-date docs.
-     * @see GetExtensionList(aiString&)*/
-    inline void GetExtensionList(std::string& szOut) const;
-
-    // -------------------------------------------------------------------
-    /** Get the number of importers currently registered with Assimp. */
-    size_t GetImporterCount() const;
-
-    // -------------------------------------------------------------------
-    /** Get meta data for the importer corresponding to a specific index..
-    *
-    *  For the declaration of #aiImporterDesc, include <assimp/importerdesc.h>.
-    *  @param index Index to query, must be within [0,GetImporterCount())
-    *  @return Importer meta data structure, NULL if the index does not
-    *     exist or if the importer doesn't offer meta information (
-    *     importers may do this at the cost of being hated by their peers).*/
-    const aiImporterDesc* GetImporterInfo(size_t index) const;
-
-    // -------------------------------------------------------------------
-    /** Find the importer corresponding to a specific index.
-    *
-    *  @param index Index to query, must be within [0,GetImporterCount())
-    *  @return Importer instance. NULL if the index does not
-    *     exist. */
-    BaseImporter* GetImporter(size_t index) const;
-
-    // -------------------------------------------------------------------
-    /** Find the importer corresponding to a specific file extension.
-    *
-    *  This is quite similar to #IsExtensionSupported except a
-    *  BaseImporter instance is returned.
-    *  @param szExtension Extension to check for. The following formats
-    *    are recognized (BAH being the file extension): "BAH" (comparison
-    *    is case-insensitive), ".bah", "*.bah" (wild card and dot
-    *    characters at the beginning of the extension are skipped).
-    *  @return NULL if no importer is found*/
-    BaseImporter* GetImporter (const char* szExtension) const;
-
-    // -------------------------------------------------------------------
-    /** Find the importer index corresponding to a specific file extension.
-    *
-    *  @param szExtension Extension to check for. The following formats
-    *    are recognized (BAH being the file extension): "BAH" (comparison
-    *    is case-insensitive), ".bah", "*.bah" (wild card and dot
-    *    characters at the beginning of the extension are skipped).
-    *  @return (size_t)-1 if no importer is found */
-    size_t GetImporterIndex (const char* szExtension) const;
-
-    // -------------------------------------------------------------------
-    /** Returns the storage allocated by ASSIMP to hold the scene data
-     * in memory.
-     *
-     * This refers to the currently loaded file, see #ReadFile().
-     * @param in Data structure to be filled.
-     * @note The returned memory statistics refer to the actual
-     *   size of the use data of the aiScene. Heap-related overhead
-     *   is (naturally) not included.*/
-    void GetMemoryRequirements(aiMemoryInfo& in) const;
-
-    // -------------------------------------------------------------------
-    /** Enables "extra verbose" mode.
-     *
-     * 'Extra verbose' means the data structure is validated after *every*
-     * single post processing step to make sure everyone modifies the data
-     * structure in a well-defined manner. This is a debug feature and not
-     * intended for use in production environments. */
-    void SetExtraVerbose(bool bDo);
-
-    // -------------------------------------------------------------------
-    /** Private, do not use. */
-    ImporterPimpl* Pimpl() { return pimpl; }
-    const ImporterPimpl* Pimpl() const { return pimpl; }
-
-protected:
-
-    // Just because we don't want you to know how we're hacking around.
-    ImporterPimpl* pimpl;
-}; //! class Importer
-
-
-// ----------------------------------------------------------------------------
-// For compatibility, the interface of some functions taking a std::string was
-// changed to const char* to avoid crashes between binary incompatible STL
-// versions. This code her is inlined,  so it shouldn't cause any problems.
-// ----------------------------------------------------------------------------
-
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE const aiScene* Importer::ReadFile( const std::string& pFile,unsigned int pFlags){
-    return ReadFile(pFile.c_str(),pFlags);
-}
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE void Importer::GetExtensionList(std::string& szOut) const   {
-    aiString s;
-    GetExtensionList(s);
-    szOut = s.data;
-}
-// ----------------------------------------------------------------------------
-AI_FORCE_INLINE bool Importer::IsExtensionSupported(const std::string& szExtension) const   {
-    return IsExtensionSupported(szExtension.c_str());
-}
-
-} // !namespace Assimp
-
-#endif // AI_ASSIMP_HPP_INC
diff --git a/thirdparty/assimp/include/assimp/LineSplitter.h b/thirdparty/assimp/include/assimp/LineSplitter.h
deleted file mode 100644
index 6c1097bb6d..0000000000
--- a/thirdparty/assimp/include/assimp/LineSplitter.h
+++ /dev/null
@@ -1,289 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file  LineSplitter.h
- *  @brief LineSplitter, a helper class to iterate through all lines
- *    of a file easily. Works with StreamReader.
- */
-#pragma once
-#ifndef INCLUDED_LINE_SPLITTER_H
-#define INCLUDED_LINE_SPLITTER_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <stdexcept>
-#include <assimp/StreamReader.h>
-#include <assimp/ParsingUtils.h>
-
-namespace Assimp {
-
-// ------------------------------------------------------------------------------------------------
-/** Usage:
-@code
-for(LineSplitter splitter(stream);splitter;++splitter) {
-
-    if (*splitter == "hi!") {
-       ...
-    }
-    else if (splitter->substr(0,5) == "hello") {
-       ...
-       // access the third token in the line (tokens are space-separated)
-       if (strtol(splitter[2]) > 5) { .. }
-    }
-
-    std::cout << "Current line is: " << splitter.get_index() << std::endl;
-}
-@endcode
-*/
-// ------------------------------------------------------------------------------------------------
-class LineSplitter {
-public:
-    typedef size_t line_idx;
-
-    // -----------------------------------------
-    /** construct from existing stream reader
-    note: trim is *always* assumed true if skyp_empty_lines==true
-    */
-    LineSplitter(StreamReaderLE& stream, bool skip_empty_lines = true, bool trim = true);
-
-    ~LineSplitter();
-
-    // -----------------------------------------
-    /** pseudo-iterator increment */
-    LineSplitter& operator++();
-
-    // -----------------------------------------
-    LineSplitter& operator++(int);
-
-    // -----------------------------------------
-    /** get a pointer to the beginning of a particular token */
-    const char* operator[] (size_t idx) const;
-
-    // -----------------------------------------
-    /** extract the start positions of N tokens from the current line*/
-    template <size_t N>
-    void get_tokens(const char* (&tokens)[N]) const;
-
-    // -----------------------------------------
-    /** member access */
-    const std::string* operator -> () const;
-
-    std::string operator* () const;
-
-    // -----------------------------------------
-    /** boolean context */
-    operator bool() const;
-
-    // -----------------------------------------
-    /** line indices are zero-based, empty lines are included */
-    operator line_idx() const;
-
-    line_idx get_index() const;
-
-    // -----------------------------------------
-    /** access the underlying stream object */
-    StreamReaderLE& get_stream();
-
-    // -----------------------------------------
-    /** !strcmp((*this)->substr(0,strlen(check)),check) */
-    bool match_start(const char* check);
-
-    // -----------------------------------------
-    /** swallow the next call to ++, return the previous value. */
-    void swallow_next_increment();
-
-    LineSplitter( const LineSplitter & ) = delete;
-    LineSplitter(LineSplitter &&) = delete;
-    LineSplitter &operator = ( const LineSplitter & ) = delete;
-
-private:
-    line_idx mIdx;
-    std::string mCur;
-    StreamReaderLE& mStream;
-    bool mSwallow, mSkip_empty_lines, mTrim;
-};
-
-AI_FORCE_INLINE
-LineSplitter::LineSplitter(StreamReaderLE& stream, bool skip_empty_lines, bool trim )
-: mIdx(0)
-, mCur()
-, mStream(stream)
-, mSwallow()
-, mSkip_empty_lines(skip_empty_lines)
-, mTrim(trim) {
-    mCur.reserve(1024);
-    operator++();
-    mIdx = 0;
-}
-
-AI_FORCE_INLINE
-LineSplitter::~LineSplitter() {
-    // empty
-}
-
-AI_FORCE_INLINE
-LineSplitter& LineSplitter::operator++() {
-    if (mSwallow) {
-        mSwallow = false;
-        return *this;
-    }
-
-    if (!*this) {
-        throw std::logic_error("End of file, no more lines to be retrieved.");
-    }
-
-    char s;
-    mCur.clear();
-    while (mStream.GetRemainingSize() && (s = mStream.GetI1(), 1)) {
-        if (s == '\n' || s == '\r') {
-            if (mSkip_empty_lines) {
-                while (mStream.GetRemainingSize() && ((s = mStream.GetI1()) == ' ' || s == '\r' || s == '\n'));
-                if (mStream.GetRemainingSize()) {
-                    mStream.IncPtr(-1);
-                }
-            } else {
-                // skip both potential line terminators but don't read past this line.
-                if (mStream.GetRemainingSize() && (s == '\r' && mStream.GetI1() != '\n')) {
-                    mStream.IncPtr(-1);
-                }
-                if (mTrim) {
-                    while (mStream.GetRemainingSize() && ((s = mStream.GetI1()) == ' ' || s == '\t'));
-                    if (mStream.GetRemainingSize()) {
-                        mStream.IncPtr(-1);
-                    }
-                }
-            }
-            break;
-        }
-        mCur += s;
-    }
-    ++mIdx;
-
-    return *this;
-}
-
-AI_FORCE_INLINE
-LineSplitter &LineSplitter::operator++(int) {
-    return ++(*this);
-}
-
-AI_FORCE_INLINE
-const char *LineSplitter::operator[] (size_t idx) const {
-    const char* s = operator->()->c_str();
-
-    SkipSpaces(&s);
-    for (size_t i = 0; i < idx; ++i) {
-
-        for (; !IsSpace(*s); ++s) {
-            if (IsLineEnd(*s)) {
-                throw std::range_error("Token index out of range, EOL reached");
-            }
-        }
-        SkipSpaces(&s);
-    }
-    return s;
-}
-
-template <size_t N>
-AI_FORCE_INLINE
-void LineSplitter::get_tokens(const char* (&tokens)[N]) const {
-    const char* s = operator->()->c_str();
-
-    SkipSpaces(&s);
-    for (size_t i = 0; i < N; ++i) {
-        if (IsLineEnd(*s)) {
-            throw std::range_error("Token count out of range, EOL reached");
-        }
-        tokens[i] = s;
-
-        for (; *s && !IsSpace(*s); ++s);
-        SkipSpaces(&s);
-    }
-}
-
-AI_FORCE_INLINE
-const std::string* LineSplitter::operator -> () const {
-    return &mCur;
-}
-
-AI_FORCE_INLINE
-std::string LineSplitter::operator* () const {
-    return mCur;
-}
-
-AI_FORCE_INLINE
-LineSplitter::operator bool() const {
-    return mStream.GetRemainingSize() > 0;
-}
-
-AI_FORCE_INLINE
-LineSplitter::operator line_idx() const {
-    return mIdx;
-}
-
-AI_FORCE_INLINE
-LineSplitter::line_idx LineSplitter::get_index() const {
-    return mIdx;
-}
-
-AI_FORCE_INLINE
-StreamReaderLE &LineSplitter::get_stream() {
-    return mStream;
-}
-
-AI_FORCE_INLINE
-bool LineSplitter::match_start(const char* check) {
-    const size_t len = ::strlen(check);
-
-    return len <= mCur.length() && std::equal(check, check + len, mCur.begin());
-}
-
-AI_FORCE_INLINE
-void LineSplitter::swallow_next_increment() {
-    mSwallow = true;
-}
-
-} // Namespace Assimp
-
-#endif // INCLUDED_LINE_SPLITTER_H
diff --git a/thirdparty/assimp/include/assimp/LogAux.h b/thirdparty/assimp/include/assimp/LogAux.h
deleted file mode 100644
index bcead78dd3..0000000000
--- a/thirdparty/assimp/include/assimp/LogAux.h
+++ /dev/null
@@ -1,136 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file  LogAux.h
- *  @brief Common logging usage patterns for importer implementations
- */
-#pragma once
-#ifndef INCLUDED_AI_LOGAUX_H
-#define INCLUDED_AI_LOGAUX_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/TinyFormatter.h>
-#include <assimp/Exceptional.h>
-#include <assimp/DefaultLogger.hpp>
-
-namespace Assimp {
-
-template<class TDeriving>
-class LogFunctions {
-public:
-    // ------------------------------------------------------------------------------------------------
-    static void ThrowException(const std::string& msg)
-    {
-        throw DeadlyImportError(Prefix()+msg);
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogWarn(const Formatter::format& message)   {
-        if (!DefaultLogger::isNullLogger()) {
-            ASSIMP_LOG_WARN(Prefix()+(std::string)message);
-        }
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogError(const Formatter::format& message)  {
-        if (!DefaultLogger::isNullLogger()) {
-            ASSIMP_LOG_ERROR(Prefix()+(std::string)message);
-        }
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogInfo(const Formatter::format& message)   {
-        if (!DefaultLogger::isNullLogger()) {
-            ASSIMP_LOG_INFO(Prefix()+(std::string)message);
-        }
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogDebug(const Formatter::format& message)  {
-        if (!DefaultLogger::isNullLogger()) {
-            ASSIMP_LOG_DEBUG(Prefix()+(std::string)message);
-        }
-    }
-
-    // https://sourceforge.net/tracker/?func=detail&atid=1067632&aid=3358562&group_id=226462
-#if !defined(__GNUC__) || !defined(__APPLE__) || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogWarn  (const char* message) {
-        if (!DefaultLogger::isNullLogger()) {
-            LogWarn(Formatter::format(message));
-        }
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogError  (const char* message) {
-        if (!DefaultLogger::isNullLogger()) {
-            LogError(Formatter::format(message));
-        }
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogInfo  (const char* message) {
-        if (!DefaultLogger::isNullLogger()) {
-            LogInfo(Formatter::format(message));
-        }
-    }
-
-    // ------------------------------------------------------------------------------------------------
-    static void LogDebug  (const char* message) {
-        if (!DefaultLogger::isNullLogger()) {
-            LogDebug(Formatter::format(message));
-        }
-    }
-
-#endif
-
-private:
-    static const char* Prefix();
-
-};
-} // ! Assimp
-
-#endif
diff --git a/thirdparty/assimp/include/assimp/LogStream.hpp b/thirdparty/assimp/include/assimp/LogStream.hpp
deleted file mode 100644
index d0281e2d02..0000000000
--- a/thirdparty/assimp/include/assimp/LogStream.hpp
+++ /dev/null
@@ -1,111 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file LogStream.hpp
- *  @brief Abstract base class 'LogStream', representing an output log stream.
- */
-#ifndef INCLUDED_AI_LOGSTREAM_H
-#define INCLUDED_AI_LOGSTREAM_H
-
-#include "types.h"
-
-namespace Assimp    {
-
-class IOSystem;
-
-// ------------------------------------------------------------------------------------
-/** @brief CPP-API: Abstract interface for log stream implementations.
- *
- *  Several default implementations are provided, see #aiDefaultLogStream for more
- *  details. Writing your own implementation of LogStream is just necessary if these
- *  are not enough for your purpose. */
-class ASSIMP_API LogStream
-#ifndef SWIG
-    : public Intern::AllocateFromAssimpHeap
-#endif
-{
-protected:
-    /** @brief  Default constructor */
-    LogStream() AI_NO_EXCEPT;
-
-public:
-    /** @brief  Virtual destructor  */
-    virtual ~LogStream();
-
-    // -------------------------------------------------------------------
-    /** @brief  Overwrite this for your own output methods
-     *
-     *  Log messages *may* consist of multiple lines and you shouldn't
-     *  expect a consistent formatting. If you want custom formatting
-     *  (e.g. generate HTML), supply a custom instance of Logger to
-     *  #DefaultLogger:set(). Usually you can *expect* that a log message
-     *  is exactly one line and terminated with a single \n character.
-     *  @param message Message to be written */
-    virtual void write(const char* message) = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Creates a default log stream
-     *  @param streams Type of the default stream
-     *  @param name For aiDefaultLogStream_FILE: name of the output file
-     *  @param io For aiDefaultLogStream_FILE: IOSystem to be used to open the output
-     *   file. Pass NULL for the default implementation.
-     *  @return New LogStream instance.  */
-    static LogStream* createDefaultStream(aiDefaultLogStream stream,
-        const char* name = "AssimpLog.txt",
-        IOSystem* io = nullptr );
-
-}; // !class LogStream
-
-inline
-LogStream::LogStream() AI_NO_EXCEPT {
-    // empty
-}
-
-inline
-LogStream::~LogStream() {
-    // empty
-}
-
-// ------------------------------------------------------------------------------------
-} // Namespace Assimp
-
-#endif
diff --git a/thirdparty/assimp/include/assimp/Logger.hpp b/thirdparty/assimp/include/assimp/Logger.hpp
deleted file mode 100644
index 89cade6c33..0000000000
--- a/thirdparty/assimp/include/assimp/Logger.hpp
+++ /dev/null
@@ -1,305 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Logger.hpp
- *  @brief Abstract base class 'Logger', base of the logging system.
- */
-#ifndef INCLUDED_AI_LOGGER_H
-#define INCLUDED_AI_LOGGER_H
-
-#include <assimp/types.h>
-#include <assimp/TinyFormatter.h>
-
-namespace Assimp {
-
-class LogStream;
-
-// Maximum length of a log message. Longer messages are rejected.
-#define MAX_LOG_MESSAGE_LENGTH 1024u
-
-// ----------------------------------------------------------------------------------
-/** @brief CPP-API: Abstract interface for logger implementations.
- *  Assimp provides a default implementation and uses it for almost all
- *  logging stuff ('DefaultLogger'). This class defines just basic logging
- *  behavior and is not of interest for you. Instead, take a look at #DefaultLogger. */
-class ASSIMP_API Logger
-#ifndef SWIG
-    : public Intern::AllocateFromAssimpHeap
-#endif
-{
-public:
-
-    // ----------------------------------------------------------------------
-    /** @enum   LogSeverity
-     *  @brief  Log severity to describe the granularity of logging.
-     */
-    enum LogSeverity {
-        NORMAL,     //!< Normal granularity of logging
-        VERBOSE     //!< Debug infos will be logged, too
-    };
-
-    // ----------------------------------------------------------------------
-    /** @enum   ErrorSeverity
-     *  @brief  Description for severity of a log message.
-     *
-     *  Every LogStream has a bitwise combination of these flags.
-     *  A LogStream doesn't receive any messages of a specific type
-     *  if it doesn't specify the corresponding ErrorSeverity flag.
-     */
-    enum ErrorSeverity {
-        Debugging   = 1,    //!< Debug log message
-        Info        = 2,    //!< Info log message
-        Warn        = 4,    //!< Warn log message
-        Err         = 8     //!< Error log message
-    };
-
-public:
-
-    /** @brief  Virtual destructor */
-    virtual ~Logger();
-
-    // ----------------------------------------------------------------------
-    /** @brief  Writes a debug message
-     *   @param message Debug message*/
-    void debug(const char* message);
-    void debug(const std::string &message);
-
-    // ----------------------------------------------------------------------
-    /** @brief  Writes a info message
-     *  @param  message Info message*/
-    void info(const char* message);
-    void info(const std::string &message);
-
-    // ----------------------------------------------------------------------
-    /** @brief  Writes a warning message
-     *  @param  message Warn message*/
-    void warn(const char* message);
-    void warn(const std::string &message);
-
-    // ----------------------------------------------------------------------
-    /** @brief  Writes an error message
-     *  @param  message Error message*/
-    void error(const char* message);
-    void error(const std::string &message);
-
-    // ----------------------------------------------------------------------
-    /** @brief  Set a new log severity.
-     *  @param  log_severity New severity for logging*/
-    void setLogSeverity(LogSeverity log_severity);
-
-    // ----------------------------------------------------------------------
-    /** @brief Get the current log severity*/
-    LogSeverity getLogSeverity() const;
-
-    // ----------------------------------------------------------------------
-    /** @brief  Attach a new log-stream
-     *
-     *  The logger takes ownership of the stream and is responsible
-     *  for its destruction (which is done using ::delete when the logger
-     *  itself is destroyed). Call detachStream to detach a stream and to
-     *  gain ownership of it again.
-     *   @param pStream  Log-stream to attach
-     *  @param severity  Message filter, specified which types of log
-     *    messages are dispatched to the stream. Provide a bitwise
-     *    combination of the ErrorSeverity flags.
-     *  @return true if the stream has been attached, false otherwise.*/
-    virtual bool attachStream(LogStream *pStream,
-        unsigned int severity = Debugging | Err | Warn | Info) = 0;
-
-    // ----------------------------------------------------------------------
-    /** @brief  Detach a still attached stream from the logger (or
-     *          modify the filter flags bits)
-     *   @param pStream Log-stream instance for detaching
-     *  @param severity Provide a bitwise combination of the ErrorSeverity
-     *    flags. This value is &~ed with the current flags of the stream,
-     *    if the result is 0 the stream is detached from the Logger and
-     *    the caller retakes the possession of the stream.
-     *  @return true if the stream has been detached, false otherwise.*/
-    virtual bool detatchStream(LogStream *pStream,
-        unsigned int severity = Debugging | Err | Warn | Info) = 0;
-
-protected:
-    /**
-     *  Default constructor
-     */
-    Logger() AI_NO_EXCEPT;
-
-    /**
-     *  Construction with a given log severity
-     */
-    explicit Logger(LogSeverity severity);
-
-    // ----------------------------------------------------------------------
-    /**
-     *  @brief Called as a request to write a specific debug message
-     *  @param  message Debug message. Never longer than
-     *    MAX_LOG_MESSAGE_LENGTH characters (excluding the '0').
-     *  @note  The message string is only valid until the scope of
-     *    the function is left.
-     */
-    virtual void OnDebug(const char* message)= 0;
-
-    // ----------------------------------------------------------------------
-    /**
-     *  @brief Called as a request to write a specific info message
-     *  @param  message Info message. Never longer than
-     *    MAX_LOG_MESSAGE_LENGTH characters (ecxluding the '0').
-     *  @note  The message string is only valid until the scope of
-     *    the function is left.
-     */
-    virtual void OnInfo(const char* message) = 0;
-
-    // ----------------------------------------------------------------------
-    /**
-     *  @brief Called as a request to write a specific warn message
-     *  @param  message Warn message. Never longer than
-     *    MAX_LOG_MESSAGE_LENGTH characters (exluding the '0').
-     *  @note  The message string is only valid until the scope of
-     *    the function is left.
-     */
-    virtual void OnWarn(const char* essage) = 0;
-
-    // ----------------------------------------------------------------------
-    /**
-     *  @brief Called as a request to write a specific error message
-     *  @param  message Error message. Never longer than
-     *    MAX_LOG_MESSAGE_LENGTH characters (exluding the '0').
-     *  @note  The message string is only valid until the scope of
-     *    the function is left.
-     */
-    virtual void OnError(const char* message) = 0;
-
-protected:
-    LogSeverity m_Severity;
-};
-
-// ----------------------------------------------------------------------------------
-//  Default constructor
-inline
-Logger::Logger() AI_NO_EXCEPT
-: m_Severity(NORMAL) {
-    // empty
-}
-
-// ----------------------------------------------------------------------------------
-//  Virtual destructor
-inline
-Logger::~Logger() {
-    // empty
-}
-
-// ----------------------------------------------------------------------------------
-// Construction with given logging severity
-inline
-Logger::Logger(LogSeverity severity)
-: m_Severity(severity) {
-    // empty
-}
-
-// ----------------------------------------------------------------------------------
-// Log severity setter
-inline
-void Logger::setLogSeverity(LogSeverity log_severity){
-    m_Severity = log_severity;
-}
-
-// ----------------------------------------------------------------------------------
-// Log severity getter
-inline
-Logger::LogSeverity Logger::getLogSeverity() const {
-    return m_Severity;
-}
-
-// ----------------------------------------------------------------------------------
-inline
-void Logger::debug(const std::string &message) {
-    return debug(message.c_str());
-}
-
-// ----------------------------------------------------------------------------------
-inline
-void Logger::error(const std::string &message) {
-    return error(message.c_str());
-}
-
-// ----------------------------------------------------------------------------------
-inline
-void Logger::warn(const std::string &message) {
-    return warn(message.c_str());
-}
-
-// ----------------------------------------------------------------------------------
-inline
-void Logger::info(const std::string &message) {
-    return info(message.c_str());
-}
-
-// ------------------------------------------------------------------------------------------------
-#define ASSIMP_LOG_WARN_F(string,...)\
-    DefaultLogger::get()->warn((Formatter::format(string),__VA_ARGS__))
-
-#define ASSIMP_LOG_ERROR_F(string,...)\
-    DefaultLogger::get()->error((Formatter::format(string),__VA_ARGS__))
-
-#define ASSIMP_LOG_DEBUG_F(string,...)\
-    DefaultLogger::get()->debug((Formatter::format(string),__VA_ARGS__))
-
-#define ASSIMP_LOG_INFO_F(string,...)\
-    DefaultLogger::get()->info((Formatter::format(string),__VA_ARGS__))
-
-
-#define ASSIMP_LOG_WARN(string)\
-    DefaultLogger::get()->warn(string)
-
-#define ASSIMP_LOG_ERROR(string)\
-    DefaultLogger::get()->error(string)
-
-#define ASSIMP_LOG_DEBUG(string)\
-    DefaultLogger::get()->debug(string)
-
-#define ASSIMP_LOG_INFO(string)\
-    DefaultLogger::get()->info(string)
-
-
-} // Namespace Assimp
-
-#endif // !! INCLUDED_AI_LOGGER_H
diff --git a/thirdparty/assimp/include/assimp/MathFunctions.h b/thirdparty/assimp/include/assimp/MathFunctions.h
deleted file mode 100644
index b6c5872a72..0000000000
--- a/thirdparty/assimp/include/assimp/MathFunctions.h
+++ /dev/null
@@ -1,90 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2016, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-#pragma once
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-/** @file  MathFunctions.h
-*  @brief Implementation of math utility functions.
- *
-*/
-
-#include <limits>
-
-namespace Assimp {
-namespace Math {
-
-// TODO: use binary GCD for unsigned integers ....
-template < typename IntegerType >
-inline
-IntegerType gcd( IntegerType a, IntegerType b ) {
-	const IntegerType zero = (IntegerType)0;
-	while ( true ) {
-		if ( a == zero )
-			return b;
-		b %= a;
-
-		if ( b == zero )
-			return a;
-		a %= b;
-	}
-}
-
-template < typename IntegerType >
-inline
-IntegerType lcm( IntegerType a, IntegerType b ) {
-	const IntegerType t = gcd (a,b);
-	if (!t)
-        return t;
-	return a / t * b;
-}
-
-template<class T>
-inline
-T getEpsilon() {
-    return std::numeric_limits<T>::epsilon();
-}
-
-}
-}
diff --git a/thirdparty/assimp/include/assimp/MemoryIOWrapper.h b/thirdparty/assimp/include/assimp/MemoryIOWrapper.h
deleted file mode 100644
index 5598d4fc5f..0000000000
--- a/thirdparty/assimp/include/assimp/MemoryIOWrapper.h
+++ /dev/null
@@ -1,250 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file MemoryIOWrapper.h
- *  Handy IOStream/IOSystem implemetation to read directly from a memory buffer */
-#pragma once
-#ifndef AI_MEMORYIOSTREAM_H_INC
-#define AI_MEMORYIOSTREAM_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/IOStream.hpp>
-#include <assimp/IOSystem.hpp>
-#include <assimp/ai_assert.h>
-
-#include <stdint.h>
-
-namespace Assimp    {
-    
-#define AI_MEMORYIO_MAGIC_FILENAME "$$$___magic___$$$"
-#define AI_MEMORYIO_MAGIC_FILENAME_LENGTH 17
-
-// ----------------------------------------------------------------------------------
-/** Implementation of IOStream to read directly from a memory buffer */
-// ----------------------------------------------------------------------------------
-class MemoryIOStream : public IOStream {
-public:
-    MemoryIOStream (const uint8_t* buff, size_t len, bool own = false)
-    : buffer (buff)
-    , length(len)
-    , pos((size_t)0)
-    , own(own) {
-        // empty
-    }
-
-    ~MemoryIOStream ()  {
-        if(own) {
-            delete[] buffer;
-        }
-    }
-
-    // -------------------------------------------------------------------
-    // Read from stream
-    size_t Read(void* pvBuffer, size_t pSize, size_t pCount)    {
-        ai_assert(nullptr != pvBuffer);
-        ai_assert(0 != pSize);
-        
-        const size_t cnt = std::min( pCount, (length-pos) / pSize);
-        const size_t ofs = pSize * cnt;
-
-        ::memcpy(pvBuffer,buffer+pos,ofs);
-        pos += ofs;
-
-        return cnt;
-    }
-
-    // -------------------------------------------------------------------
-    // Write to stream
-    size_t Write(const void* /*pvBuffer*/, size_t /*pSize*/,size_t /*pCount*/)  {
-        ai_assert(false); // won't be needed
-        return 0;
-    }
-
-    // -------------------------------------------------------------------
-    // Seek specific position
-    aiReturn Seek(size_t pOffset, aiOrigin pOrigin) {
-        if (aiOrigin_SET == pOrigin) {
-            if (pOffset > length) {
-                return AI_FAILURE;
-            }
-            pos = pOffset;
-        } else if (aiOrigin_END == pOrigin) {
-            if (pOffset > length) {
-                return AI_FAILURE;
-            }
-            pos = length-pOffset;
-        } else {
-            if (pOffset+pos > length) {
-                return AI_FAILURE;
-            }
-            pos += pOffset;
-        }
-        return AI_SUCCESS;
-    }
-
-    // -------------------------------------------------------------------
-    // Get current seek position
-    size_t Tell() const {
-        return pos;
-    }
-
-    // -------------------------------------------------------------------
-    // Get size of file
-    size_t FileSize() const {
-        return length;
-    }
-
-    // -------------------------------------------------------------------
-    // Flush file contents
-    void Flush() {
-        ai_assert(false); // won't be needed
-    }
-
-private:
-    const uint8_t* buffer;
-    size_t length,pos;
-    bool own;
-};
-
-// ---------------------------------------------------------------------------
-/** Dummy IO system to read from a memory buffer */
-class MemoryIOSystem : public IOSystem {
-public:
-    /** Constructor. */
-    MemoryIOSystem(const uint8_t* buff, size_t len, IOSystem* io)
-    : buffer(buff)
-    , length(len)
-    , existing_io(io)
-    , created_streams() {
-        // empty
-    }
-
-    /** Destructor. */
-    ~MemoryIOSystem() {
-    }
-
-    // -------------------------------------------------------------------
-    /** Tests for the existence of a file at the given path. */
-    bool Exists(const char* pFile) const override {
-        if (0 == strncmp( pFile, AI_MEMORYIO_MAGIC_FILENAME, AI_MEMORYIO_MAGIC_FILENAME_LENGTH ) ) {
-            return true;
-        }
-        return existing_io ? existing_io->Exists(pFile) : false;
-    }
-
-    // -------------------------------------------------------------------
-    /** Returns the directory separator. */
-    char getOsSeparator() const override {
-        return existing_io ? existing_io->getOsSeparator()
-                           : '/';  // why not? it doesn't care
-    }
-
-    // -------------------------------------------------------------------
-    /** Open a new file with a given path. */
-    IOStream* Open(const char* pFile, const char* pMode = "rb") override {
-        if ( 0 == strncmp( pFile, AI_MEMORYIO_MAGIC_FILENAME, AI_MEMORYIO_MAGIC_FILENAME_LENGTH ) ) {
-            created_streams.emplace_back(new MemoryIOStream(buffer, length));
-            return created_streams.back();
-        }
-        return existing_io ? existing_io->Open(pFile, pMode) : NULL;
-    }
-
-    // -------------------------------------------------------------------
-    /** Closes the given file and releases all resources associated with it. */
-    void Close( IOStream* pFile) override {
-        auto it = std::find(created_streams.begin(), created_streams.end(), pFile);
-        if (it != created_streams.end()) {
-            delete pFile;
-            created_streams.erase(it);
-        } else if (existing_io) {
-            existing_io->Close(pFile);
-        }
-    }
-
-    // -------------------------------------------------------------------
-    /** Compare two paths */
-    bool ComparePaths(const char* one, const char* second) const override {
-        return existing_io ? existing_io->ComparePaths(one, second) : false;
-    }
-
-    bool PushDirectory( const std::string &path ) override { 
-        return existing_io ? existing_io->PushDirectory(path) : false;
-    }
-
-    const std::string &CurrentDirectory() const override {
-        static std::string empty;
-        return existing_io ? existing_io->CurrentDirectory() : empty;
-    }
-
-    size_t StackSize() const override {
-        return existing_io ? existing_io->StackSize() : 0;
-    }
-
-    bool PopDirectory() override {
-        return existing_io ? existing_io->PopDirectory() : false;
-    }
-
-    bool CreateDirectory( const std::string &path ) override {
-        return existing_io ? existing_io->CreateDirectory(path) : false;
-    }
-
-    bool ChangeDirectory( const std::string &path ) override {
-        return existing_io ? existing_io->ChangeDirectory(path) : false;
-    }
-
-    bool DeleteFile( const std::string &file ) override {
-        return existing_io ? existing_io->DeleteFile(file) : false;
-    }
-
-private:
-    const uint8_t* buffer;
-    size_t length;
-    IOSystem* existing_io;
-    std::vector<IOStream*> created_streams;
-};
-
-} // end namespace Assimp
-
-#endif
diff --git a/thirdparty/assimp/include/assimp/NullLogger.hpp b/thirdparty/assimp/include/assimp/NullLogger.hpp
deleted file mode 100644
index c45d01bd48..0000000000
--- a/thirdparty/assimp/include/assimp/NullLogger.hpp
+++ /dev/null
@@ -1,99 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file  NullLogger.hpp
- *  @brief Dummy logger
-*/
-
-#ifndef INCLUDED_AI_NULLLOGGER_H
-#define INCLUDED_AI_NULLLOGGER_H
-
-#include "Logger.hpp"
-
-namespace Assimp {
-
-// ---------------------------------------------------------------------------
-/** @brief CPP-API: Empty logging implementation.
- *
- * Does nothing! Used by default if the application hasn't requested a
- * custom logger via #DefaultLogger::set() or #DefaultLogger::create(); */
-class ASSIMP_API NullLogger
-    : public Logger {
-
-public:
-
-    /** @brief  Logs a debug message */
-    void OnDebug(const char* message) {
-        (void)message; //this avoids compiler warnings
-    }
-
-    /** @brief  Logs an info message */
-    void OnInfo(const char* message) {
-        (void)message; //this avoids compiler warnings
-    }
-
-    /** @brief  Logs a warning message */
-    void OnWarn(const char* message) {
-        (void)message; //this avoids compiler warnings
-    }
-
-    /** @brief  Logs an error message */
-    void OnError(const char* message) {
-        (void)message; //this avoids compiler warnings
-    }
-
-    /** @brief  Detach a still attached stream from logger */
-    bool attachStream(LogStream *pStream, unsigned int severity) {
-        (void)pStream; (void)severity; //this avoids compiler warnings
-        return false;
-    }
-
-    /** @brief  Detach a still attached stream from logger */
-    bool detatchStream(LogStream *pStream, unsigned int severity) {
-        (void)pStream; (void)severity; //this avoids compiler warnings
-        return false;
-    }
-
-private:
-};
-}
-#endif // !! AI_NULLLOGGER_H_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/ParsingUtils.h b/thirdparty/assimp/include/assimp/ParsingUtils.h
deleted file mode 100644
index 3025601246..0000000000
--- a/thirdparty/assimp/include/assimp/ParsingUtils.h
+++ /dev/null
@@ -1,264 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-
-/** @file ParsingUtils.h
- *  @brief Defines helper functions for text parsing
- */
-#pragma once
-#ifndef AI_PARSING_UTILS_H_INC
-#define AI_PARSING_UTILS_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/StringComparison.h>
-#include <assimp/StringUtils.h>
-#include <assimp/defs.h>
-
-namespace Assimp {
-
-// NOTE: the functions below are mostly intended as replacement for
-// std::upper, std::lower, std::isupper, std::islower, std::isspace.
-// we don't bother of locales. We don't want them. We want reliable
-// (i.e. identical) results across all locales.
-
-// The functions below accept any character type, but know only
-// about ASCII. However, UTF-32 is the only safe ASCII superset to
-// use since it doesn't have multi-byte sequences.
-
-static const unsigned int BufferSize = 4096;
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-char_t ToLower( char_t in ) {
-    return (in >= (char_t)'A' && in <= (char_t)'Z') ? (char_t)(in+0x20) : in;
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-char_t ToUpper( char_t in) {
-    return (in >= (char_t)'a' && in <= (char_t)'z') ? (char_t)(in-0x20) : in;
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool IsUpper( char_t in) {
-    return (in >= (char_t)'A' && in <= (char_t)'Z');
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool IsLower( char_t in) {
-    return (in >= (char_t)'a' && in <= (char_t)'z');
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool IsSpace( char_t in) {
-    return (in == (char_t)' ' || in == (char_t)'\t');
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool IsLineEnd( char_t in) {
-    return (in==(char_t)'\r'||in==(char_t)'\n'||in==(char_t)'\0'||in==(char_t)'\f');
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool IsSpaceOrNewLine( char_t in) {
-    return IsSpace<char_t>(in) || IsLineEnd<char_t>(in);
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool SkipSpaces( const char_t* in, const char_t** out) {
-    while( *in == ( char_t )' ' || *in == ( char_t )'\t' ) {
-        ++in;
-    }
-    *out = in;
-    return !IsLineEnd<char_t>(*in);
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool SkipSpaces( const char_t** inout) {
-    return SkipSpaces<char_t>(*inout,inout);
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool SkipLine( const char_t* in, const char_t** out) {
-    while( *in != ( char_t )'\r' && *in != ( char_t )'\n' && *in != ( char_t )'\0' ) {
-        ++in;
-    }
-
-    // files are opened in binary mode. Ergo there are both NL and CR
-    while( *in == ( char_t )'\r' || *in == ( char_t )'\n' ) {
-        ++in;
-    }
-    *out = in;
-    return *in != (char_t)'\0';
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool SkipLine( const char_t** inout) {
-    return SkipLine<char_t>(*inout,inout);
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool SkipSpacesAndLineEnd( const char_t* in, const char_t** out) {
-    while( *in == ( char_t )' ' || *in == ( char_t )'\t' || *in == ( char_t )'\r' || *in == ( char_t )'\n' ) {
-        ++in;
-    }
-    *out = in;
-    return *in != '\0';
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool SkipSpacesAndLineEnd( const char_t** inout) {
-    return SkipSpacesAndLineEnd<char_t>(*inout,inout);
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool GetNextLine( const char_t*& buffer, char_t out[ BufferSize ] ) {
-    if( ( char_t )'\0' == *buffer ) {
-        return false;
-    }
-
-    char* _out = out;
-    char* const end = _out + BufferSize;
-    while( !IsLineEnd( *buffer ) && _out < end ) {
-        *_out++ = *buffer++;
-    }
-    *_out = (char_t)'\0';
-
-    while( IsLineEnd( *buffer ) && '\0' != *buffer ) {
-        ++buffer;
-    }
-
-    return true;
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE bool IsNumeric( char_t in) {
-    return ( in >= '0' && in <= '9' ) || '-' == in || '+' == in;
-}
-
-// ---------------------------------------------------------------------------------
-template <class char_t>
-AI_FORCE_INLINE
-bool TokenMatch(char_t*& in, const char* token, unsigned int len)
-{
-    if (!::strncmp(token,in,len) && IsSpaceOrNewLine(in[len])) {
-        if (in[len] != '\0') {
-            in += len+1;
-        } else {
-            // If EOF after the token make sure we don't go past end of buffer
-            in += len;
-        }
-        return true;
-    }
-
-    return false;
-}
-// ---------------------------------------------------------------------------------
-/** @brief Case-ignoring version of TokenMatch
- *  @param in Input
- *  @param token Token to check for
- *  @param len Number of characters to check
- */
-AI_FORCE_INLINE
-bool TokenMatchI(const char*& in, const char* token, unsigned int len) {
-    if (!ASSIMP_strincmp(token,in,len) && IsSpaceOrNewLine(in[len])) {
-        in += len+1;
-        return true;
-    }
-    return false;
-}
-
-// ---------------------------------------------------------------------------------
-AI_FORCE_INLINE
-void SkipToken(const char*& in) {
-    SkipSpaces(&in);
-    while ( !IsSpaceOrNewLine( *in ) ) {
-        ++in;
-    }
-}
-
-// ---------------------------------------------------------------------------------
-AI_FORCE_INLINE
-std::string GetNextToken(const char*& in) {
-    SkipSpacesAndLineEnd(&in);
-    const char* cur = in;
-    while ( !IsSpaceOrNewLine( *in ) ) {
-        ++in;
-    }
-    return std::string(cur,(size_t)(in-cur));
-}
-
-// ---------------------------------------------------------------------------------
-
-} // ! namespace Assimp
-
-#endif // ! AI_PARSING_UTILS_H_INC
diff --git a/thirdparty/assimp/include/assimp/Profiler.h b/thirdparty/assimp/include/assimp/Profiler.h
deleted file mode 100644
index 624029be99..0000000000
--- a/thirdparty/assimp/include/assimp/Profiler.h
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Profiler.h
- *  @brief Utility to measure the respective runtime of each import step
- */
-#pragma once
-#ifndef AI_INCLUDED_PROFILER_H
-#define AI_INCLUDED_PROFILER_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <chrono>
-#include <assimp/DefaultLogger.hpp>
-#include <assimp/TinyFormatter.h>
-
-#include <map>
-
-namespace Assimp {
-namespace Profiling {
-
-using namespace Formatter;
-
-// ------------------------------------------------------------------------------------------------
-/** Simple wrapper around boost::timer to simplify reporting. Timings are automatically
- *  dumped to the log file.
- */
-class Profiler {
-public:
-    Profiler() {
-        // empty
-    }
-
-
-    /** Start a named timer */
-    void BeginRegion(const std::string& region) {
-        regions[region] = std::chrono::system_clock::now();
-        ASSIMP_LOG_DEBUG((format("START `"),region,"`"));
-    }
-
-
-    /** End a specific named timer and write its end time to the log */
-    void EndRegion(const std::string& region) {
-        RegionMap::const_iterator it = regions.find(region);
-        if (it == regions.end()) {
-            return;
-        }
-
-        std::chrono::duration<double> elapsedSeconds = std::chrono::system_clock::now() - regions[region];
-        ASSIMP_LOG_DEBUG((format("END   `"),region,"`, dt= ", elapsedSeconds.count()," s"));
-    }
-
-private:
-    typedef std::map<std::string,std::chrono::time_point<std::chrono::system_clock>> RegionMap;
-    RegionMap regions;
-};
-
-}
-}
-
-#endif // AI_INCLUDED_PROFILER_H
-
diff --git a/thirdparty/assimp/include/assimp/ProgressHandler.hpp b/thirdparty/assimp/include/assimp/ProgressHandler.hpp
deleted file mode 100644
index 8991a64618..0000000000
--- a/thirdparty/assimp/include/assimp/ProgressHandler.hpp
+++ /dev/null
@@ -1,149 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file ProgressHandler.hpp
- *  @brief Abstract base class 'ProgressHandler'.
- */
-#pragma once
-#ifndef AI_PROGRESSHANDLER_H_INC
-#define AI_PROGRESSHANDLER_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-
-namespace Assimp {
-
-// ------------------------------------------------------------------------------------
-/** @brief CPP-API: Abstract interface for custom progress report receivers.
- *
- *  Each #Importer instance maintains its own #ProgressHandler. The default
- *  implementation provided by Assimp doesn't do anything at all. */
-class ASSIMP_API ProgressHandler
-#ifndef SWIG
-    : public Intern::AllocateFromAssimpHeap
-#endif
-{
-protected:
-    /// @brief  Default constructor
-    ProgressHandler () AI_NO_EXCEPT {
-        // empty
-    }
-
-public:
-    /// @brief  Virtual destructor.
-    virtual ~ProgressHandler () {
-    }
-
-    // -------------------------------------------------------------------
-    /** @brief Progress callback.
-     *  @param percentage An estimate of the current loading progress,
-     *    in percent. Or -1.f if such an estimate is not available.
-     *
-     *  There are restriction on what you may do from within your
-     *  implementation of this method: no exceptions may be thrown and no
-     *  non-const #Importer methods may be called. It is
-     *  not generally possible to predict the number of callbacks
-     *  fired during a single import.
-     *
-     *  @return Return false to abort loading at the next possible
-     *   occasion (loaders and Assimp are generally allowed to perform
-     *   all needed cleanup tasks prior to returning control to the
-     *   caller). If the loading is aborted, #Importer::ReadFile()
-     *   returns always NULL.
-     *   */
-    virtual bool Update(float percentage = -1.f) = 0;
-
-    // -------------------------------------------------------------------
-    /** @brief Progress callback for file loading steps
-     *  @param numberOfSteps The number of total post-processing
-     *   steps
-     *  @param currentStep The index of the current post-processing
-     *   step that will run, or equal to numberOfSteps if all of
-     *   them has finished. This number is always strictly monotone
-     *   increasing, although not necessarily linearly.
-     *
-     *  @note This is currently only used at the start and the end
-     *   of the file parsing.
-     *   */
-    virtual void UpdateFileRead(int currentStep /*= 0*/, int numberOfSteps /*= 0*/) {
-        float f = numberOfSteps ? currentStep / (float)numberOfSteps : 1.0f;
-        Update( f * 0.5f );
-    }
-
-    // -------------------------------------------------------------------
-    /** @brief Progress callback for post-processing steps
-     *  @param numberOfSteps The number of total post-processing
-     *   steps
-     *  @param currentStep The index of the current post-processing
-     *   step that will run, or equal to numberOfSteps if all of
-     *   them has finished. This number is always strictly monotone
-     *   increasing, although not necessarily linearly.
-     *   */
-    virtual void UpdatePostProcess(int currentStep /*= 0*/, int numberOfSteps /*= 0*/) {
-        float f = numberOfSteps ? currentStep / (float)numberOfSteps : 1.0f;
-        Update( f * 0.5f + 0.5f );
-    }
-
-
-    // -------------------------------------------------------------------
-    /** @brief Progress callback for export steps.
-     *  @param numberOfSteps The number of total processing
-     *   steps
-     *  @param currentStep The index of the current post-processing
-     *   step that will run, or equal to numberOfSteps if all of
-     *   them has finished. This number is always strictly monotone
-     *   increasing, although not necessarily linearly.
-     *   */
-    virtual void UpdateFileWrite(int currentStep /*= 0*/, int numberOfSteps /*= 0*/) {
-        float f = numberOfSteps ? currentStep / (float)numberOfSteps : 1.0f;
-        Update(f * 0.5f);
-    }
-}; // !class ProgressHandler
-
-// ------------------------------------------------------------------------------------
-
-} // Namespace Assimp
-
-#endif // AI_PROGRESSHANDLER_H_INC
diff --git a/thirdparty/assimp/include/assimp/RemoveComments.h b/thirdparty/assimp/include/assimp/RemoveComments.h
deleted file mode 100644
index f129420535..0000000000
--- a/thirdparty/assimp/include/assimp/RemoveComments.h
+++ /dev/null
@@ -1,93 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Declares a helper class, "CommentRemover", which can be
- *  used to remove comments (single and multi line) from a text file.
- */
-#pragma once
-#ifndef AI_REMOVE_COMMENTS_H_INC
-#define AI_REMOVE_COMMENTS_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/defs.h>
-
-namespace Assimp    {
-
-// ---------------------------------------------------------------------------
-/** \brief Helper class to remove single and multi line comments from a file
- *
- *  Some mesh formats like MD5 have comments that are quite similar
- *  to those in C or C++ so this code has been moved to a separate
- *  module.
- */
-class ASSIMP_API CommentRemover {
-    // class cannot be instanced
-    CommentRemover() {}
-
-public:
-
-    //! Remove single-line comments. The end of a line is
-    //! expected to be either NL or CR or NLCR.
-    //! \param szComment The start sequence of the comment, e.g. "//"
-    //! \param szBuffer Buffer to work with
-    //! \param chReplacement Character to be used as replacement
-    //! for commented lines. By default this is ' '
-    static void RemoveLineComments(const char* szComment,
-        char* szBuffer, char chReplacement = ' ');
-
-    //! Remove multi-line comments. The end of a line is
-    //! expected to be either NL or CR or NLCR. Multi-line comments
-    //! may not be nested (as in C).
-    //! \param szCommentStart The start sequence of the comment, e.g. "/*"
-    //! \param szCommentEnd The end sequence of the comment, e.g. "*/"
-    //! \param szBuffer Buffer to work with
-    //! \param chReplacement Character to be used as replacement
-    //! for commented lines. By default this is ' '
-    static void RemoveMultiLineComments(const char* szCommentStart,
-        const char* szCommentEnd,char* szBuffer,
-        char chReplacement = ' ');
-};
-} // ! Assimp
-
-#endif // !! AI_REMOVE_COMMENTS_H_INC
diff --git a/thirdparty/assimp/include/assimp/SGSpatialSort.h b/thirdparty/assimp/include/assimp/SGSpatialSort.h
deleted file mode 100644
index fdb5ce8174..0000000000
--- a/thirdparty/assimp/include/assimp/SGSpatialSort.h
+++ /dev/null
@@ -1,155 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** Small helper classes to optimize finding vertices close to a given location
- */
-#pragma once
-#ifndef AI_D3DSSPATIALSORT_H_INC
-#define AI_D3DSSPATIALSORT_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-#include <vector>
-#include <stdint.h>
-
-namespace Assimp    {
-
-// ----------------------------------------------------------------------------------
-/** Specialized version of SpatialSort to support smoothing groups
- *  This is used in by the 3DS, ASE and LWO loaders. 3DS and ASE share their
- *  normal computation code in SmoothingGroups.inl, the LWO loader has its own
- *  implementation to handle all details of its file format correctly.
- */
-// ----------------------------------------------------------------------------------
-class ASSIMP_API SGSpatialSort
-{
-public:
-
-    SGSpatialSort();
-
-    // -------------------------------------------------------------------
-    /** Construction from a given face array, handling smoothing groups
-     *  properly
-     */
-    explicit SGSpatialSort(const std::vector<aiVector3D>& vPositions);
-
-    // -------------------------------------------------------------------
-    /** Add a vertex to the spatial sort
-     * @param vPosition Vertex position to be added
-     * @param index Index of the vrtex
-     * @param smoothingGroup SmoothingGroup for this vertex
-     */
-    void Add(const aiVector3D& vPosition, unsigned int index,
-        unsigned int smoothingGroup);
-
-    // -------------------------------------------------------------------
-    /** Prepare the spatial sorter for use. This step runs in O(logn)
-     */
-    void Prepare();
-
-    /** Destructor */
-    ~SGSpatialSort();
-
-    // -------------------------------------------------------------------
-    /** Returns an iterator for all positions close to the given position.
-     * @param pPosition The position to look for vertices.
-     * @param pSG Only included vertices with at least one shared smooth group
-     * @param pRadius Maximal distance from the position a vertex may have
-     *   to be counted in.
-     * @param poResults The container to store the indices of the found
-     *   positions. Will be emptied by the call so it may contain anything.
-     * @param exactMatch Specifies whether smoothing groups are bit masks
-     *   (false) or integral values (true). In the latter case, a vertex
-     *   cannot belong to more than one smoothing group.
-     * @return An iterator to iterate over all vertices in the given area.
-     */
-    // -------------------------------------------------------------------
-    void FindPositions( const aiVector3D& pPosition, uint32_t pSG,
-        float pRadius, std::vector<unsigned int>& poResults,
-        bool exactMatch = false) const;
-
-protected:
-    /** Normal of the sorting plane, normalized. The center is always at (0, 0, 0) */
-    aiVector3D mPlaneNormal;
-
-    // -------------------------------------------------------------------
-    /** An entry in a spatially sorted position array. Consists of a
-     *  vertex index, its position and its pre-calculated distance from
-     *  the reference plane */
-    // -------------------------------------------------------------------
-    struct Entry {
-        unsigned int mIndex;    ///< The vertex referred by this entry
-        aiVector3D mPosition;   ///< Position
-        uint32_t mSmoothGroups;
-        float mDistance;        ///< Distance of this vertex to the sorting plane
-
-        Entry() AI_NO_EXCEPT
-        : mIndex(0)
-        , mPosition()
-        , mSmoothGroups(0)
-        , mDistance(0.0f) {
-            // empty
-        }
-
-        Entry( unsigned int pIndex, const aiVector3D& pPosition, float pDistance,uint32_t pSG)
-        : mIndex( pIndex)
-        , mPosition( pPosition)
-        , mSmoothGroups(pSG)
-        , mDistance( pDistance) {
-            // empty
-        }
-
-        bool operator < (const Entry& e) const {
-            return mDistance < e.mDistance;
-        }
-    };
-
-    // all positions, sorted by distance to the sorting plane
-    std::vector<Entry> mPositions;
-};
-
-} // end of namespace Assimp
-
-#endif // AI_SPATIALSORT_H_INC
diff --git a/thirdparty/assimp/include/assimp/SceneCombiner.h b/thirdparty/assimp/include/assimp/SceneCombiner.h
deleted file mode 100644
index 0683c1e052..0000000000
--- a/thirdparty/assimp/include/assimp/SceneCombiner.h
+++ /dev/null
@@ -1,410 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Declares a helper class, "SceneCombiner" providing various
- *  utilities to merge scenes.
- */
-#pragma once
-#ifndef AI_SCENE_COMBINER_H_INC
-#define AI_SCENE_COMBINER_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/ai_assert.h>
-#include <assimp/types.h>
-#include <assimp/Defines.h>
-
-#include <stddef.h>
-#include <set>
-#include <list>
-#include <stdint.h>
-#include <vector>
-
-struct aiScene;
-struct aiNode;
-struct aiMaterial;
-struct aiTexture;
-struct aiCamera;
-struct aiLight;
-struct aiMetadata;
-struct aiBone;
-struct aiMesh;
-struct aiAnimMesh;
-struct aiAnimation;
-struct aiNodeAnim;
-struct aiMeshMorphAnim;
-
-namespace Assimp    {
-
-// ---------------------------------------------------------------------------
-/** \brief Helper data structure for SceneCombiner.
- *
- *  Describes to which node a scene must be attached to.
- */
-struct AttachmentInfo
-{
-    AttachmentInfo()
-        :   scene           (NULL)
-        ,   attachToNode    (NULL)
-    {}
-
-    AttachmentInfo(aiScene* _scene, aiNode* _attachToNode)
-        :   scene           (_scene)
-        ,   attachToNode    (_attachToNode)
-    {}
-
-    aiScene* scene;
-    aiNode*  attachToNode;
-};
-
-// ---------------------------------------------------------------------------
-struct NodeAttachmentInfo
-{
-    NodeAttachmentInfo()
-        :   node            (NULL)
-        ,   attachToNode    (NULL)
-        ,   resolved        (false)
-        ,   src_idx         (SIZE_MAX)
-    {}
-
-    NodeAttachmentInfo(aiNode* _scene, aiNode* _attachToNode,size_t idx)
-        :   node            (_scene)
-        ,   attachToNode    (_attachToNode)
-        ,   resolved        (false)
-        ,   src_idx         (idx)
-    {}
-
-    aiNode*  node;
-    aiNode*  attachToNode;
-    bool     resolved;
-    size_t   src_idx;
-};
-
-// ---------------------------------------------------------------------------
-/** @def AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES
- *  Generate unique names for all named scene items
- */
-#define AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES      0x1
-
-/** @def AI_INT_MERGE_SCENE_GEN_UNIQUE_MATNAMES
- *  Generate unique names for materials, too.
- *  This is not absolutely required to pass the validation.
- */
-#define AI_INT_MERGE_SCENE_GEN_UNIQUE_MATNAMES   0x2
-
-/** @def AI_INT_MERGE_SCENE_DUPLICATES_DEEP_CPY
- * Use deep copies of duplicate scenes
- */
-#define AI_INT_MERGE_SCENE_DUPLICATES_DEEP_CPY   0x4
-
-/** @def AI_INT_MERGE_SCENE_RESOLVE_CROSS_ATTACHMENTS
- * If attachment nodes are not found in the given master scene,
- * search the other imported scenes for them in an any order.
- */
-#define AI_INT_MERGE_SCENE_RESOLVE_CROSS_ATTACHMENTS 0x8
-
-/** @def AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES_IF_NECESSARY
- * Can be combined with AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES.
- * Unique names are generated, but only if this is absolutely
- * required to avoid name conflicts.
- */
-#define AI_INT_MERGE_SCENE_GEN_UNIQUE_NAMES_IF_NECESSARY 0x10
-
-typedef std::pair<aiBone*,unsigned int> BoneSrcIndex;
-
-// ---------------------------------------------------------------------------
-/** @brief Helper data structure for SceneCombiner::MergeBones.
- */
-struct BoneWithHash : public std::pair<uint32_t,aiString*>  {
-    std::vector<BoneSrcIndex> pSrcBones;
-};
-
-// ---------------------------------------------------------------------------
-/** @brief Utility for SceneCombiner
- */
-struct SceneHelper
-{
-    SceneHelper ()
-        : scene     (NULL)
-        , idlen     (0)
-    {
-        id[0] = 0;
-    }
-
-    explicit SceneHelper (aiScene* _scene)
-        : scene     (_scene)
-        , idlen     (0)
-    {
-        id[0] = 0;
-    }
-
-    AI_FORCE_INLINE aiScene* operator-> () const
-    {
-        return scene;
-    }
-
-    // scene we're working on
-    aiScene* scene;
-
-    // prefix to be added to all identifiers in the scene ...
-    char id [32];
-
-    // and its strlen()
-    unsigned int idlen;
-
-    // hash table to quickly check whether a name is contained in the scene
-    std::set<unsigned int> hashes;
-};
-
-// ---------------------------------------------------------------------------
-/** \brief Static helper class providing various utilities to merge two
- *    scenes. It is intended as internal utility and NOT for use by
- *    applications.
- *
- * The class is currently being used by various postprocessing steps
- * and loaders (ie. LWS).
- */
-class ASSIMP_API SceneCombiner {
-    // class cannot be instanced
-    SceneCombiner() {
-        // empty
-    }
-
-    ~SceneCombiner() {
-        // empty
-    }
-
-public:
-    // -------------------------------------------------------------------
-    /** Merges two or more scenes.
-     *
-     *  @param dest  Receives a pointer to the destination scene. If the
-     *    pointer doesn't point to NULL when the function is called, the
-     *    existing scene is cleared and refilled.
-     *  @param src Non-empty list of scenes to be merged. The function
-     *    deletes the input scenes afterwards. There may be duplicate scenes.
-     *  @param flags Combination of the AI_INT_MERGE_SCENE flags defined above
-     */
-    static void MergeScenes(aiScene** dest,std::vector<aiScene*>& src,
-        unsigned int flags = 0);
-
-    // -------------------------------------------------------------------
-    /** Merges two or more scenes and attaches all scenes to a specific
-     *  position in the node graph of the master scene.
-     *
-     *  @param dest Receives a pointer to the destination scene. If the
-     *    pointer doesn't point to NULL when the function is called, the
-     *    existing scene is cleared and refilled.
-     *  @param master Master scene. It will be deleted afterwards. All
-     *    other scenes will be inserted in its node graph.
-     *  @param src Non-empty list of scenes to be merged along with their
-     *    corresponding attachment points in the master scene. The function
-     *    deletes the input scenes afterwards. There may be duplicate scenes.
-     *  @param flags Combination of the AI_INT_MERGE_SCENE flags defined above
-     */
-    static void MergeScenes(aiScene** dest, aiScene* master,
-        std::vector<AttachmentInfo>& src,
-        unsigned int flags = 0);
-
-    // -------------------------------------------------------------------
-    /** Merges two or more meshes
-     *
-     *  The meshes should have equal vertex formats. Only components
-     *  that are provided by ALL meshes will be present in the output mesh.
-     *  An exception is made for VColors - they are set to black. The
-     *  meshes should have the same material indices, too. The output
-     *  material index is always the material index of the first mesh.
-     *
-     *  @param dest Destination mesh. Must be empty.
-     *  @param flags Currently no parameters
-     *  @param begin First mesh to be processed
-     *  @param end Points to the mesh after the last mesh to be processed
-     */
-    static void MergeMeshes(aiMesh** dest,unsigned int flags,
-        std::vector<aiMesh*>::const_iterator begin,
-        std::vector<aiMesh*>::const_iterator end);
-
-    // -------------------------------------------------------------------
-    /** Merges two or more bones
-     *
-     *  @param out Mesh to receive the output bone list
-     *  @param flags Currently no parameters
-     *  @param begin First mesh to be processed
-     *  @param end Points to the mesh after the last mesh to be processed
-     */
-    static void MergeBones(aiMesh* out,std::vector<aiMesh*>::const_iterator it,
-        std::vector<aiMesh*>::const_iterator end);
-
-    // -------------------------------------------------------------------
-    /** Merges two or more materials
-     *
-     *  The materials should be complementary as much as possible. In case
-     *  of a property present in different materials, the first occurrence
-     *  is used.
-     *
-     *  @param dest Destination material. Must be empty.
-     *  @param begin First material to be processed
-     *  @param end Points to the material after the last material to be processed
-     */
-    static void MergeMaterials(aiMaterial** dest,
-        std::vector<aiMaterial*>::const_iterator begin,
-        std::vector<aiMaterial*>::const_iterator end);
-
-    // -------------------------------------------------------------------
-    /** Builds a list of uniquely named bones in a mesh list
-     *
-     *  @param asBones Receives the output list
-     *  @param it First mesh to be processed
-     *  @param end Last mesh to be processed
-     */
-    static void BuildUniqueBoneList(std::list<BoneWithHash>& asBones,
-        std::vector<aiMesh*>::const_iterator it,
-        std::vector<aiMesh*>::const_iterator end);
-
-    // -------------------------------------------------------------------
-    /** Add a name prefix to all nodes in a scene.
-     *
-     *  @param Current node. This function is called recursively.
-     *  @param prefix Prefix to be added to all nodes
-     *  @param len STring length
-     */
-    static void AddNodePrefixes(aiNode* node, const char* prefix,
-        unsigned int len);
-
-    // -------------------------------------------------------------------
-    /** Add an offset to all mesh indices in a node graph
-     *
-     *  @param Current node. This function is called recursively.
-     *  @param offset Offset to be added to all mesh indices
-     */
-    static void OffsetNodeMeshIndices (aiNode* node, unsigned int offset);
-
-    // -------------------------------------------------------------------
-    /** Attach a list of node graphs to well-defined nodes in a master
-     *  graph. This is a helper for MergeScenes()
-     *
-     *  @param master Master scene
-     *  @param srcList List of source scenes along with their attachment
-     *    points. If an attachment point is NULL (or does not exist in
-     *    the master graph), a scene is attached to the root of the master
-     *    graph (as an additional child node)
-     *  @duplicates List of duplicates. If elem[n] == n the scene is not
-     *    a duplicate. Otherwise elem[n] links scene n to its first occurrence.
-     */
-    static void AttachToGraph ( aiScene* master,
-        std::vector<NodeAttachmentInfo>& srcList);
-
-    static void AttachToGraph (aiNode* attach,
-        std::vector<NodeAttachmentInfo>& srcList);
-
-
-    // -------------------------------------------------------------------
-    /** Get a deep copy of a scene
-     *
-     *  @param dest Receives a pointer to the destination scene
-     *  @param src Source scene - remains unmodified.
-     */
-    static void CopyScene(aiScene** dest,const aiScene* source,bool allocate = true);
-
-
-    // -------------------------------------------------------------------
-    /** Get a flat copy of a scene
-     *
-     *  Only the first hierarchy layer is copied. All pointer members of
-     *  aiScene are shared by source and destination scene.  If the
-     *    pointer doesn't point to NULL when the function is called, the
-     *    existing scene is cleared and refilled.
-     *  @param dest Receives a pointer to the destination scene
-     *  @param src Source scene - remains unmodified.
-     */
-    static void CopySceneFlat(aiScene** dest,const aiScene* source);
-
-
-    // -------------------------------------------------------------------
-    /** Get a deep copy of a mesh
-     *
-     *  @param dest Receives a pointer to the destination mesh
-     *  @param src Source mesh - remains unmodified.
-     */
-    static void Copy     (aiMesh** dest, const aiMesh* src);
-
-    // similar to Copy():
-    static void Copy  (aiAnimMesh** dest, const aiAnimMesh* src);
-    static void Copy  (aiMaterial** dest, const aiMaterial* src);
-    static void Copy  (aiTexture** dest, const aiTexture* src);
-    static void Copy  (aiAnimation** dest, const aiAnimation* src);
-    static void Copy  (aiCamera** dest, const aiCamera* src);
-    static void Copy  (aiBone** dest, const aiBone* src);
-    static void Copy  (aiLight** dest, const aiLight* src);
-    static void Copy  (aiNodeAnim** dest, const aiNodeAnim* src);
-    static void Copy  (aiMeshMorphAnim** dest, const aiMeshMorphAnim* src);
-    static void Copy  (aiMetadata** dest, const aiMetadata* src);
-
-    // recursive, of course
-    static void Copy     (aiNode** dest, const aiNode* src);
-
-
-private:
-
-    // -------------------------------------------------------------------
-    // Same as AddNodePrefixes, but with an additional check
-    static void AddNodePrefixesChecked(aiNode* node, const char* prefix,
-        unsigned int len,
-        std::vector<SceneHelper>& input,
-        unsigned int cur);
-
-    // -------------------------------------------------------------------
-    // Add node identifiers to a hashing set
-    static void AddNodeHashes(aiNode* node, std::set<unsigned int>& hashes);
-
-
-    // -------------------------------------------------------------------
-    // Search for duplicate names
-    static bool FindNameMatch(const aiString& name,
-        std::vector<SceneHelper>& input, unsigned int cur);
-};
-
-}
-
-#endif // !! AI_SCENE_COMBINER_H_INC
diff --git a/thirdparty/assimp/include/assimp/SkeletonMeshBuilder.h b/thirdparty/assimp/include/assimp/SkeletonMeshBuilder.h
deleted file mode 100644
index ad979a33fa..0000000000
--- a/thirdparty/assimp/include/assimp/SkeletonMeshBuilder.h
+++ /dev/null
@@ -1,130 +0,0 @@
-/** Helper class to construct a dummy mesh for file formats containing only motion data */
-
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file SkeletonMeshBuilder.h
- *  Declares SkeletonMeshBuilder, a tiny utility to build dummy meshes
- *  for animation skeletons.
- */
-
-#pragma once
-#ifndef AI_SKELETONMESHBUILDER_H_INC
-#define AI_SKELETONMESHBUILDER_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <vector>
-#include <assimp/mesh.h>
-
-struct aiMaterial;
-struct aiScene;
-struct aiNode;
-
-namespace Assimp    {
-
-// ---------------------------------------------------------------------------
-/**
- * This little helper class constructs a dummy mesh for a given scene
- * the resembles the node hierarchy. This is useful for file formats
- * that don't carry any mesh data but only animation data.
- */
-class ASSIMP_API SkeletonMeshBuilder
-{
-public:
-
-    // -------------------------------------------------------------------
-    /** The constructor processes the given scene and adds a mesh there.
-     *
-     * Does nothing if the scene already has mesh data.
-     * @param pScene The scene for which a skeleton mesh should be constructed.
-     * @param root The node to start with. NULL is the scene root
-     * @param bKnobsOnly Set this to true if you don't want the connectors
-     *   between the knobs representing the nodes.
-     */
-    SkeletonMeshBuilder( aiScene* pScene, aiNode* root = NULL,
-        bool bKnobsOnly = false);
-
-protected:
-
-    // -------------------------------------------------------------------
-    /** Recursively builds a simple mesh representation for the given node
-     * and also creates a joint for the node that affects this part of
-     * the mesh.
-     * @param pNode The node to build geometry for.
-     */
-    void CreateGeometry( const aiNode* pNode);
-
-    // -------------------------------------------------------------------
-    /** Creates the mesh from the internally accumulated stuff and returns it.
-     */
-    aiMesh* CreateMesh();
-
-    // -------------------------------------------------------------------
-    /** Creates a dummy material and returns it. */
-    aiMaterial* CreateMaterial();
-
-protected:
-    /** space to assemble the mesh data: points */
-    std::vector<aiVector3D> mVertices;
-
-    /** faces */
-    struct Face
-    {
-        unsigned int mIndices[3];
-        Face();
-        Face( unsigned int p0, unsigned int p1, unsigned int p2)
-        { mIndices[0] = p0; mIndices[1] = p1; mIndices[2] = p2; }
-    };
-    std::vector<Face> mFaces;
-
-    /** bones */
-    std::vector<aiBone*> mBones;
-
-    bool mKnobsOnly;
-};
-
-} // end of namespace Assimp
-
-#endif // AI_SKELETONMESHBUILDER_H_INC
diff --git a/thirdparty/assimp/include/assimp/SmoothingGroups.h b/thirdparty/assimp/include/assimp/SmoothingGroups.h
deleted file mode 100644
index c1a93947f1..0000000000
--- a/thirdparty/assimp/include/assimp/SmoothingGroups.h
+++ /dev/null
@@ -1,114 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Defines the helper data structures for importing 3DS files.
-http://www.jalix.org/ressources/graphics/3DS/_unofficials/3ds-unofficial.txt */
-
-#pragma once
-#ifndef AI_SMOOTHINGGROUPS_H_INC
-#define AI_SMOOTHINGGROUPS_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/vector3.h>
-
-#include <stdint.h>
-#include <vector>
-
-// ---------------------------------------------------------------------------
-/** Helper structure representing a face with smoothing groups assigned */
-struct FaceWithSmoothingGroup {
-    FaceWithSmoothingGroup() AI_NO_EXCEPT
-    : mIndices()
-    , iSmoothGroup(0) {
-        // in debug builds set all indices to a common magic value
-#ifdef ASSIMP_BUILD_DEBUG
-        this->mIndices[0] = 0xffffffff;
-        this->mIndices[1] = 0xffffffff;
-        this->mIndices[2] = 0xffffffff;
-#endif
-    }
-
-
-    //! Indices. .3ds is using uint16. However, after
-    //! an unique vertex set has been generated,
-    //! individual index values might exceed 2^16
-    uint32_t mIndices[3];
-
-    //! specifies to which smoothing group the face belongs to
-    uint32_t iSmoothGroup;
-};
-
-// ---------------------------------------------------------------------------
-/** Helper structure representing a mesh whose faces have smoothing
-    groups assigned. This allows us to reuse the code for normal computations
-    from smoothings groups for several loaders (3DS, ASE). All of them
-    use face structures which inherit from #FaceWithSmoothingGroup,
-    but as they add extra members and need to be copied by value we
-    need to use a template here.
-    */
-template <class T>
-struct MeshWithSmoothingGroups
-{
-    //! Vertex positions
-    std::vector<aiVector3D> mPositions;
-
-    //! Face lists
-    std::vector<T> mFaces;
-
-    //! List of normal vectors
-    std::vector<aiVector3D> mNormals;
-};
-
-// ---------------------------------------------------------------------------
-/** Computes normal vectors for the mesh
- */
-template <class T>
-void ComputeNormalsWithSmoothingsGroups(MeshWithSmoothingGroups<T>& sMesh);
-
-
-// include implementations
-#include "SmoothingGroups.inl"
-
-#endif // !! AI_SMOOTHINGGROUPS_H_INC
diff --git a/thirdparty/assimp/include/assimp/SmoothingGroups.inl b/thirdparty/assimp/include/assimp/SmoothingGroups.inl
deleted file mode 100644
index 37ea083dbe..0000000000
--- a/thirdparty/assimp/include/assimp/SmoothingGroups.inl
+++ /dev/null
@@ -1,141 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2012, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms, 
-with or without modification, are permitted provided that the following 
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file Generation of normal vectors basing on smoothing groups */
-
-#pragma once
-#ifndef AI_SMOOTHINGGROUPS_INL_INCLUDED
-#define AI_SMOOTHINGGROUPS_INL_INCLUDED
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/SGSpatialSort.h>
-
-#include <algorithm>
-
-using namespace Assimp;
-
-// ------------------------------------------------------------------------------------------------
-template <class T>
-void ComputeNormalsWithSmoothingsGroups(MeshWithSmoothingGroups<T>& sMesh)
-{
-    // First generate face normals
-    sMesh.mNormals.resize(sMesh.mPositions.size(),aiVector3D());
-    for( unsigned int a = 0; a < sMesh.mFaces.size(); a++)
-    {
-        T& face = sMesh.mFaces[a];
-
-        aiVector3D* pV1 = &sMesh.mPositions[face.mIndices[0]];
-        aiVector3D* pV2 = &sMesh.mPositions[face.mIndices[1]];
-        aiVector3D* pV3 = &sMesh.mPositions[face.mIndices[2]];
-
-        aiVector3D pDelta1 = *pV2 - *pV1;
-        aiVector3D pDelta2 = *pV3 - *pV1;
-        aiVector3D vNor = pDelta1 ^ pDelta2;
-
-        for (unsigned int c = 0; c < 3;++c)
-            sMesh.mNormals[face.mIndices[c]] = vNor;
-    }
-
-    // calculate the position bounds so we have a reliable epsilon to check position differences against 
-    aiVector3D minVec( 1e10f, 1e10f, 1e10f), maxVec( -1e10f, -1e10f, -1e10f);
-    for( unsigned int a = 0; a < sMesh.mPositions.size(); a++)
-    {
-        minVec.x = std::min( minVec.x, sMesh.mPositions[a].x);
-        minVec.y = std::min( minVec.y, sMesh.mPositions[a].y);
-        minVec.z = std::min( minVec.z, sMesh.mPositions[a].z);
-        maxVec.x = std::max( maxVec.x, sMesh.mPositions[a].x);
-        maxVec.y = std::max( maxVec.y, sMesh.mPositions[a].y);
-        maxVec.z = std::max( maxVec.z, sMesh.mPositions[a].z);
-    }
-    const float posEpsilon = (maxVec - minVec).Length() * 1e-5f;
-    std::vector<aiVector3D> avNormals;
-    avNormals.resize(sMesh.mNormals.size());
-    
-    // now generate the spatial sort tree
-    SGSpatialSort sSort;
-    for( typename std::vector<T>::iterator i =  sMesh.mFaces.begin();
-        i != sMesh.mFaces.end();++i)
-    {
-        for (unsigned int c = 0; c < 3;++c)
-            sSort.Add(sMesh.mPositions[(*i).mIndices[c]],(*i).mIndices[c],(*i).iSmoothGroup);
-    }
-    sSort.Prepare();
-
-    std::vector<bool> vertexDone(sMesh.mPositions.size(),false);
-    for( typename std::vector<T>::iterator i =  sMesh.mFaces.begin();
-        i != sMesh.mFaces.end();++i)
-    {
-        std::vector<unsigned int> poResult;
-        for (unsigned int c = 0; c < 3;++c)
-        {
-            unsigned int idx = (*i).mIndices[c];
-            if (vertexDone[idx])continue;
-
-            sSort.FindPositions(sMesh.mPositions[idx],(*i).iSmoothGroup,
-                posEpsilon,poResult);
-
-            aiVector3D vNormals;
-            for (std::vector<unsigned int>::const_iterator
-                a =  poResult.begin();
-                a != poResult.end();++a)
-            {
-                vNormals += sMesh.mNormals[(*a)];
-            }
-            vNormals.NormalizeSafe();
-
-            // write back into all affected normals
-            for (std::vector<unsigned int>::const_iterator
-                a =  poResult.begin();
-                a != poResult.end();++a)
-            {
-                idx = *a;
-                avNormals [idx] = vNormals;
-                vertexDone[idx] = true;
-            }
-        }
-    }
-    sMesh.mNormals = avNormals;
-}
-
-#endif // !! AI_SMOOTHINGGROUPS_INL_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/SpatialSort.h b/thirdparty/assimp/include/assimp/SpatialSort.h
deleted file mode 100644
index 9f93543150..0000000000
--- a/thirdparty/assimp/include/assimp/SpatialSort.h
+++ /dev/null
@@ -1,179 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** Small helper classes to optimise finding vertizes close to a given location */
-#pragma once
-#ifndef AI_SPATIALSORT_H_INC
-#define AI_SPATIALSORT_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <vector>
-#include <assimp/types.h>
-
-namespace Assimp {
-
-// ------------------------------------------------------------------------------------------------
-/** A little helper class to quickly find all vertices in the epsilon environment of a given
- * position. Construct an instance with an array of positions. The class stores the given positions
- * by their indices and sorts them by their distance to an arbitrary chosen plane.
- * You can then query the instance for all vertices close to a given position in an average O(log n)
- * time, with O(n) worst case complexity when all vertices lay on the plane. The plane is chosen
- * so that it avoids common planes in usual data sets. */
-// ------------------------------------------------------------------------------------------------
-class ASSIMP_API SpatialSort
-{
-public:
-
-    SpatialSort();
-
-    // ------------------------------------------------------------------------------------
-    /** Constructs a spatially sorted representation from the given position array.
-     * Supply the positions in its layout in memory, the class will only refer to them
-     * by index.
-     * @param pPositions Pointer to the first position vector of the array.
-     * @param pNumPositions Number of vectors to expect in that array.
-     * @param pElementOffset Offset in bytes from the beginning of one vector in memory
-     *   to the beginning of the next vector. */
-    SpatialSort( const aiVector3D* pPositions, unsigned int pNumPositions,
-        unsigned int pElementOffset);
-
-    /** Destructor */
-    ~SpatialSort();
-
-public:
-
-    // ------------------------------------------------------------------------------------
-    /** Sets the input data for the SpatialSort. This replaces existing data, if any.
-     *  The new data receives new indices in ascending order.
-     *
-     * @param pPositions Pointer to the first position vector of the array.
-     * @param pNumPositions Number of vectors to expect in that array.
-     * @param pElementOffset Offset in bytes from the beginning of one vector in memory
-     *   to the beginning of the next vector.
-     * @param pFinalize Specifies whether the SpatialSort's internal representation
-     *   is finalized after the new data has been added. Finalization is
-     *   required in order to use #FindPosition() or #GenerateMappingTable().
-     *   If you don't finalize yet, you can use #Append() to add data from
-     *   other sources.*/
-    void Fill( const aiVector3D* pPositions, unsigned int pNumPositions,
-        unsigned int pElementOffset,
-        bool pFinalize = true);
-
-
-    // ------------------------------------------------------------------------------------
-    /** Same as #Fill(), except the method appends to existing data in the #SpatialSort. */
-    void Append( const aiVector3D* pPositions, unsigned int pNumPositions,
-        unsigned int pElementOffset,
-        bool pFinalize = true);
-
-
-    // ------------------------------------------------------------------------------------
-    /** Finalize the spatial hash data structure. This can be useful after
-     *  multiple calls to #Append() with the pFinalize parameter set to false.
-     *  This is finally required before one of #FindPositions() and #GenerateMappingTable()
-     *  can be called to query the spatial sort.*/
-    void Finalize();
-
-    // ------------------------------------------------------------------------------------
-    /** Returns an iterator for all positions close to the given position.
-     * @param pPosition The position to look for vertices.
-     * @param pRadius Maximal distance from the position a vertex may have to be counted in.
-     * @param poResults The container to store the indices of the found positions.
-     *   Will be emptied by the call so it may contain anything.
-     * @return An iterator to iterate over all vertices in the given area.*/
-    void FindPositions( const aiVector3D& pPosition, ai_real pRadius,
-        std::vector<unsigned int>& poResults) const;
-
-    // ------------------------------------------------------------------------------------
-    /** Fills an array with indices of all positions identical to the given position. In
-     *  opposite to FindPositions(), not an epsilon is used but a (very low) tolerance of
-     *  four floating-point units.
-     * @param pPosition The position to look for vertices.
-     * @param poResults The container to store the indices of the found positions.
-     *   Will be emptied by the call so it may contain anything.*/
-    void FindIdenticalPositions( const aiVector3D& pPosition,
-        std::vector<unsigned int>& poResults) const;
-
-    // ------------------------------------------------------------------------------------
-    /** Compute a table that maps each vertex ID referring to a spatially close
-     *  enough position to the same output ID. Output IDs are assigned in ascending order
-     *  from 0...n.
-     * @param fill Will be filled with numPositions entries.
-     * @param pRadius Maximal distance from the position a vertex may have to
-     *   be counted in.
-     *  @return Number of unique vertices (n).  */
-    unsigned int GenerateMappingTable(std::vector<unsigned int>& fill,
-        ai_real pRadius) const;
-
-protected:
-    /** Normal of the sorting plane, normalized. The center is always at (0, 0, 0) */
-    aiVector3D mPlaneNormal;
-
-    /** An entry in a spatially sorted position array. Consists of a vertex index,
-     * its position and its pre-calculated distance from the reference plane */
-    struct Entry {
-        unsigned int mIndex; ///< The vertex referred by this entry
-        aiVector3D mPosition; ///< Position
-        ai_real mDistance; ///< Distance of this vertex to the sorting plane
-
-        Entry() AI_NO_EXCEPT
-        : mIndex( 999999999 ), mPosition(), mDistance( 99999. ) {
-            // empty        
-        }
-        Entry( unsigned int pIndex, const aiVector3D& pPosition, ai_real pDistance)
-        : mIndex( pIndex), mPosition( pPosition), mDistance( pDistance) {
-            // empty
-        }
-
-        bool operator < (const Entry& e) const { return mDistance < e.mDistance; }
-    };
-
-    // all positions, sorted by distance to the sorting plane
-    std::vector<Entry> mPositions;
-};
-
-} // end of namespace Assimp
-
-#endif // AI_SPATIALSORT_H_INC
diff --git a/thirdparty/assimp/include/assimp/StandardShapes.h b/thirdparty/assimp/include/assimp/StandardShapes.h
deleted file mode 100644
index c594cb63f4..0000000000
--- a/thirdparty/assimp/include/assimp/StandardShapes.h
+++ /dev/null
@@ -1,205 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Declares a helper class, "StandardShapes" which generates
- *  vertices for standard shapes, such as cylinders, cones, spheres ..
- */
-#pragma once
-#ifndef AI_STANDARD_SHAPES_H_INC
-#define AI_STANDARD_SHAPES_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/vector3.h>
-#include <vector>
-
-struct aiMesh;
-
-namespace Assimp    {
-
-// ---------------------------------------------------------------------------
-/** \brief Helper class to generate vertex buffers for standard geometric
- *  shapes, such as cylinders, cones, boxes, spheres, elipsoids ... .
- */
-class ASSIMP_API StandardShapes
-{
-    // class cannot be instanced
-    StandardShapes() {}
-
-public:
-
-
-    // ----------------------------------------------------------------
-    /** Generates a mesh from an array of vertex positions.
-     *
-     *  @param positions List of vertex positions
-     *  @param numIndices Number of indices per primitive
-     *  @return Output mesh
-     */
-    static aiMesh* MakeMesh(const std::vector<aiVector3D>& positions,
-        unsigned int numIndices);
-
-
-    static aiMesh* MakeMesh ( unsigned int (*GenerateFunc)
-        (std::vector<aiVector3D>&));
-
-    static aiMesh* MakeMesh ( unsigned int (*GenerateFunc)
-        (std::vector<aiVector3D>&, bool));
-
-    static aiMesh* MakeMesh ( unsigned int n,  void (*GenerateFunc)
-        (unsigned int,std::vector<aiVector3D>&));
-
-    // ----------------------------------------------------------------
-    /** @brief Generates a hexahedron (cube)
-     *
-     *  Hexahedrons can be scaled on all axes.
-     *  @param positions Receives output triangles.
-     *  @param polygons If you pass true here quads will be returned
-     *  @return Number of vertices per face
-     */
-    static unsigned int MakeHexahedron(
-        std::vector<aiVector3D>& positions,
-        bool polygons = false);
-
-    // ----------------------------------------------------------------
-    /** @brief Generates an icosahedron
-     *
-     *  @param positions Receives output triangles.
-     *  @return Number of vertices per face
-     */
-    static unsigned int MakeIcosahedron(
-        std::vector<aiVector3D>& positions);
-
-
-    // ----------------------------------------------------------------
-    /** @brief Generates a dodecahedron
-     *
-     *  @param positions Receives output triangles
-     *  @param polygons If you pass true here pentagons will be returned
-     *  @return Number of vertices per face
-     */
-    static unsigned int MakeDodecahedron(
-        std::vector<aiVector3D>& positions,
-        bool polygons = false);
-
-
-    // ----------------------------------------------------------------
-    /** @brief Generates an octahedron
-     *
-     *  @param positions Receives output triangles.
-     *  @return Number of vertices per face
-     */
-    static unsigned int MakeOctahedron(
-        std::vector<aiVector3D>& positions);
-
-
-    // ----------------------------------------------------------------
-    /** @brief Generates a tetrahedron
-     *
-     *  @param positions Receives output triangles.
-     *  @return Number of vertices per face
-     */
-    static unsigned int MakeTetrahedron(
-        std::vector<aiVector3D>& positions);
-
-
-
-    // ----------------------------------------------------------------
-    /** @brief Generates a sphere
-     *
-     *  @param tess Number of subdivions - 0 generates a octahedron
-     *  @param positions Receives output triangles.
-     */
-    static void MakeSphere(unsigned int tess,
-        std::vector<aiVector3D>& positions);
-
-
-    // ----------------------------------------------------------------
-    /** @brief Generates a cone or a cylinder, either open or closed.
-     *
-     *  @code
-     *
-     *       |-----|       <- radius 1
-     *
-     *        __x__        <- ]               ^
-     *       /     \          | height        |
-     *      /       \         |               Y
-     *     /         \        |
-     *    /           \       |
-     *   /______x______\   <- ] <- end cap
-     *
-     *   |-------------|   <- radius 2
-     *
-     *  @endcode
-     *
-     *  @param height Height of the cone
-     *  @param radius1 First radius
-     *  @param radius2 Second radius
-     *  @param tess Number of triangles.
-     *  @param bOpened true for an open cone/cylinder. An open shape has
-     *    no 'end caps'
-     *  @param positions Receives output triangles
-     */
-    static void MakeCone(ai_real height,ai_real radius1,
-        ai_real radius2,unsigned int tess,
-        std::vector<aiVector3D>& positions,bool bOpen= false);
-
-
-    // ----------------------------------------------------------------
-    /** @brief Generates a flat circle
-     *
-     *  The circle is constructed in the planned formed by the x,z
-     *  axes of the cartesian coordinate system.
-     *
-     *  @param radius Radius of the circle
-     *  @param tess Number of segments.
-     *  @param positions Receives output triangles.
-     */
-    static void MakeCircle(ai_real radius, unsigned int tess,
-        std::vector<aiVector3D>& positions);
-
-};
-} // ! Assimp
-
-#endif // !! AI_STANDARD_SHAPES_H_INC
diff --git a/thirdparty/assimp/include/assimp/StreamReader.h b/thirdparty/assimp/include/assimp/StreamReader.h
deleted file mode 100644
index cb24f1595b..0000000000
--- a/thirdparty/assimp/include/assimp/StreamReader.h
+++ /dev/null
@@ -1,347 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file Defines the StreamReader class which reads data from
- *  a binary stream with a well-defined endianness.
- */
-#pragma once
-#ifndef AI_STREAMREADER_H_INCLUDED
-#define AI_STREAMREADER_H_INCLUDED
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/IOStream.hpp>
-#include <assimp/Defines.h>
-#include <assimp/ByteSwapper.h>
-#include <assimp/Exceptional.h>
-
-#include <memory>
-
-namespace Assimp {
-
-// --------------------------------------------------------------------------------------------
-/** Wrapper class around IOStream to allow for consistent reading of binary data in both
- *  little and big endian format. Don't attempt to instance the template directly. Use
- *  StreamReaderLE to read from a little-endian stream and StreamReaderBE to read from a
- *  BE stream. The class expects that the endianness of any input data is known at
- *  compile-time, which should usually be true (#BaseImporter::ConvertToUTF8 implements
- *  runtime endianness conversions for text files).
- *
- *  XXX switch from unsigned int for size types to size_t? or ptrdiff_t?*/
-// --------------------------------------------------------------------------------------------
-template <bool SwapEndianess = false, bool RuntimeSwitch = false>
-class StreamReader {
-public:
-    // FIXME: use these data types throughout the whole library,
-    // then change them to 64 bit values :-)
-    using diff = int;
-    using pos  = unsigned int;
-
-    // ---------------------------------------------------------------------
-    /** Construction from a given stream with a well-defined endianness.
-     *
-     *  The StreamReader holds a permanent strong reference to the
-     *  stream, which is released upon destruction.
-     *  @param stream Input stream. The stream is not restarted if
-     *    its file pointer is not at 0. Instead, the stream reader
-     *    reads from the current position to the end of the stream.
-     *  @param le If @c RuntimeSwitch is true: specifies whether the
-     *    stream is in little endian byte order. Otherwise the
-     *    endianness information is contained in the @c SwapEndianess
-     *    template parameter and this parameter is meaningless.  */
-    StreamReader(std::shared_ptr<IOStream> stream, bool le = false)
-        : stream(stream)
-        , le(le)
-    {
-        ai_assert(stream);
-        InternBegin();
-    }
-
-    // ---------------------------------------------------------------------
-    StreamReader(IOStream* stream, bool le = false)
-        : stream(std::shared_ptr<IOStream>(stream))
-        , le(le)
-    {
-        ai_assert(stream);
-        InternBegin();
-    }
-
-    // ---------------------------------------------------------------------
-    ~StreamReader() {
-        delete[] buffer;
-    }
-
-    // deprecated, use overloaded operator>> instead
-
-    // ---------------------------------------------------------------------
-    /** Read a float from the stream  */
-    float GetF4()
-    {
-        return Get<float>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read a double from the stream  */
-    double GetF8()  {
-        return Get<double>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read a signed 16 bit integer from the stream */
-    int16_t GetI2() {
-        return Get<int16_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read a signed 8 bit integer from the stream */
-    int8_t GetI1()  {
-        return Get<int8_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read an signed 32 bit integer from the stream */
-    int32_t GetI4() {
-        return Get<int32_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read a signed 64 bit integer from the stream */
-    int64_t GetI8() {
-        return Get<int64_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read a unsigned 16 bit integer from the stream */
-    uint16_t GetU2()    {
-        return Get<uint16_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read a unsigned 8 bit integer from the stream */
-    uint8_t GetU1() {
-        return Get<uint8_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read an unsigned 32 bit integer from the stream */
-    uint32_t GetU4()    {
-        return Get<uint32_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Read a unsigned 64 bit integer from the stream */
-    uint64_t GetU8()    {
-        return Get<uint64_t>();
-    }
-
-    // ---------------------------------------------------------------------
-    /** Get the remaining stream size (to the end of the stream) */
-    unsigned int GetRemainingSize() const {
-        return (unsigned int)(end - current);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Get the remaining stream size (to the current read limit). The
-     *  return value is the remaining size of the stream if no custom
-     *  read limit has been set. */
-    unsigned int GetRemainingSizeToLimit() const {
-        return (unsigned int)(limit - current);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Increase the file pointer (relative seeking)  */
-    void IncPtr(intptr_t plus)    {
-        current += plus;
-        if (current > limit) {
-            throw DeadlyImportError("End of file or read limit was reached");
-        }
-    }
-
-    // ---------------------------------------------------------------------
-    /** Get the current file pointer */
-    int8_t* GetPtr() const  {
-        return current;
-    }
-
-    // ---------------------------------------------------------------------
-    /** Set current file pointer (Get it from #GetPtr). This is if you
-     *  prefer to do pointer arithmetics on your own or want to copy
-     *  large chunks of data at once.
-     *  @param p The new pointer, which is validated against the size
-     *    limit and buffer boundaries. */
-    void SetPtr(int8_t* p)  {
-        current = p;
-        if (current > limit || current < buffer) {
-            throw DeadlyImportError("End of file or read limit was reached");
-        }
-    }
-
-    // ---------------------------------------------------------------------
-    /** Copy n bytes to an external buffer
-     *  @param out Destination for copying
-     *  @param bytes Number of bytes to copy */
-    void CopyAndAdvance(void* out, size_t bytes)    {
-        int8_t* ur = GetPtr();
-        SetPtr(ur+bytes); // fire exception if eof
-
-        ::memcpy(out,ur,bytes);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Get the current offset from the beginning of the file */
-    int GetCurrentPos() const   {
-        return (unsigned int)(current - buffer);
-    }
-
-    void SetCurrentPos(size_t pos) {
-        SetPtr(buffer + pos);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Setup a temporary read limit
-     *
-     *  @param limit Maximum number of bytes to be read from
-     *    the beginning of the file. Specifying UINT_MAX
-     *    resets the limit to the original end of the stream.
-     *  Returns the previously set limit. */
-    unsigned int SetReadLimit(unsigned int _limit)  {
-        unsigned int prev = GetReadLimit();
-        if (UINT_MAX == _limit) {
-            limit = end;
-            return prev;
-        }
-
-        limit = buffer + _limit;
-        if (limit > end) {
-            throw DeadlyImportError("StreamReader: Invalid read limit");
-        }
-        return prev;
-    }
-
-    // ---------------------------------------------------------------------
-    /** Get the current read limit in bytes. Reading over this limit
-     *  accidentally raises an exception.  */
-    unsigned int GetReadLimit() const    {
-        return (unsigned int)(limit - buffer);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Skip to the read limit in bytes. Reading over this limit
-     *  accidentally raises an exception. */
-    void SkipToReadLimit()  {
-        current = limit;
-    }
-
-    // ---------------------------------------------------------------------
-    /** overload operator>> and allow chaining of >> ops. */
-    template <typename T>
-    StreamReader& operator >> (T& f) {
-        f = Get<T>();
-        return *this;
-    }
-
-    // ---------------------------------------------------------------------
-    /** Generic read method. ByteSwap::Swap(T*) *must* be defined */
-    template <typename T>
-    T Get() {
-        if ( current + sizeof(T) > limit) {
-            throw DeadlyImportError("End of file or stream limit was reached");
-        }
-
-        T f;
-        ::memcpy (&f, current, sizeof(T));
-        Intern::Getter<SwapEndianess,T,RuntimeSwitch>() (&f,le);
-        current += sizeof(T);
-
-        return f;
-    }
-
-private:
-    // ---------------------------------------------------------------------
-    void InternBegin() {
-        if (!stream) {
-            // in case someone wonders: StreamReader is frequently invoked with
-            // no prior validation whether the input stream is valid. Since
-            // no one bothers changing the error message, this message here
-            // is passed down to the caller and 'unable to open file'
-            // simply describes best what happened.
-            throw DeadlyImportError("StreamReader: Unable to open file");
-        }
-
-        const size_t s = stream->FileSize() - stream->Tell();
-        if (!s) {
-            throw DeadlyImportError("StreamReader: File is empty or EOF is already reached");
-        }
-
-        current = buffer = new int8_t[s];
-        const size_t read = stream->Read(current,1,s);
-        // (read < s) can only happen if the stream was opened in text mode, in which case FileSize() is not reliable
-        ai_assert(read <= s);
-        end = limit = &buffer[read-1] + 1;
-    }
-
-private:
-    std::shared_ptr<IOStream> stream;
-    int8_t *buffer, *current, *end, *limit;
-    bool le;
-};
-
-// --------------------------------------------------------------------------------------------
-// `static` StreamReaders. Their byte order is fixed and they might be a little bit faster.
-#ifdef AI_BUILD_BIG_ENDIAN
-    typedef StreamReader<true>  StreamReaderLE;
-    typedef StreamReader<false> StreamReaderBE;
-#else
-    typedef StreamReader<true>  StreamReaderBE;
-    typedef StreamReader<false> StreamReaderLE;
-#endif
-
-// `dynamic` StreamReader. The byte order of the input data is specified in the
-// c'tor. This involves runtime branching and might be a little bit slower.
-typedef StreamReader<true,true> StreamReaderAny;
-
-} // end namespace Assimp
-
-#endif // !! AI_STREAMREADER_H_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/StreamWriter.h b/thirdparty/assimp/include/assimp/StreamWriter.h
deleted file mode 100644
index 489e8adfe3..0000000000
--- a/thirdparty/assimp/include/assimp/StreamWriter.h
+++ /dev/null
@@ -1,307 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file Defines the StreamWriter class which writes data to
- *  a binary stream with a well-defined endianness. */
-#pragma once
-#ifndef AI_STREAMWRITER_H_INCLUDED
-#define AI_STREAMWRITER_H_INCLUDED
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/ByteSwapper.h>
-#include <assimp/IOStream.hpp>
-
-#include <memory>
-#include <vector>
-
-namespace Assimp {
-
-// --------------------------------------------------------------------------------------------
-/** Wrapper class around IOStream to allow for consistent writing of binary data in both
- *  little and big endian format. Don't attempt to instance the template directly. Use
- *  StreamWriterLE to write to a little-endian stream and StreamWriterBE to write to a
- *  BE stream. Alternatively, there is StreamWriterAny if the endianness of the output
- *  stream is to be determined at runtime.
- */
-// --------------------------------------------------------------------------------------------
-template <bool SwapEndianess = false, bool RuntimeSwitch = false>
-class StreamWriter
-{
-    enum {
-        INITIAL_CAPACITY = 1024
-    };
-
-public:
-
-    // ---------------------------------------------------------------------
-    /** Construction from a given stream with a well-defined endianness.
-     *
-     *  The StreamReader holds a permanent strong reference to the
-     *  stream, which is released upon destruction.
-     *  @param stream Input stream. The stream is not re-seeked and writing
-          continues at the current position of the stream cursor.
-     *  @param le If @c RuntimeSwitch is true: specifies whether the
-     *    stream is in little endian byte order. Otherwise the
-     *    endianness information is defined by the @c SwapEndianess
-     *    template parameter and this parameter is meaningless.  */
-    StreamWriter(std::shared_ptr<IOStream> stream, bool le = false)
-        : stream(stream)
-        , le(le)
-        , cursor()
-    {
-        ai_assert(stream);
-        buffer.reserve(INITIAL_CAPACITY);
-    }
-
-    // ---------------------------------------------------------------------
-    StreamWriter(IOStream* stream, bool le = false)
-        : stream(std::shared_ptr<IOStream>(stream))
-        , le(le)
-        , cursor()
-    {
-        ai_assert(stream);
-        buffer.reserve(INITIAL_CAPACITY);
-    }
-
-    // ---------------------------------------------------------------------
-    ~StreamWriter() {
-        stream->Write(buffer.data(), 1, buffer.size());
-        stream->Flush();
-    }
-
-public:
-
-    // ---------------------------------------------------------------------
-    /** Flush the contents of the internal buffer, and the output IOStream */
-    void Flush()
-    {
-        stream->Write(buffer.data(), 1, buffer.size());
-        stream->Flush();
-        buffer.clear();
-        cursor = 0;
-    }
-
-    // ---------------------------------------------------------------------
-    /** Seek to the given offset / origin in the output IOStream.
-     *
-     *  Flushes the internal buffer and the output IOStream prior to seeking. */
-    aiReturn Seek(size_t pOffset, aiOrigin pOrigin=aiOrigin_SET)
-    {
-        Flush();
-        return stream->Seek(pOffset, pOrigin);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Tell the current position in the output IOStream.
-     *
-     *  First flushes the internal buffer and the output IOStream. */
-    size_t Tell()
-    {
-        Flush();
-        return stream->Tell();
-    }
-
-public:
-
-    // ---------------------------------------------------------------------
-    /** Write a float to the stream  */
-    void PutF4(float f)
-    {
-        Put(f);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a double to the stream  */
-    void PutF8(double d)    {
-        Put(d);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a signed 16 bit integer to the stream */
-    void PutI2(int16_t n)   {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a signed 8 bit integer to the stream */
-    void PutI1(int8_t n)    {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write an signed 32 bit integer to the stream */
-    void PutI4(int32_t n)   {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a signed 64 bit integer to the stream */
-    void PutI8(int64_t n)   {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a unsigned 16 bit integer to the stream */
-    void PutU2(uint16_t n)  {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a unsigned 8 bit integer to the stream */
-    void PutU1(uint8_t n)   {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write an unsigned 32 bit integer to the stream */
-    void PutU4(uint32_t n)  {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a unsigned 64 bit integer to the stream */
-    void PutU8(uint64_t n)  {
-        Put(n);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a single character to the stream */
-    void PutChar(char c)    {
-        Put(c);
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write an aiString to the stream */
-    void PutString(const aiString& s)
-    {
-        // as Put(T f) below
-        if (cursor + s.length >= buffer.size()) {
-            buffer.resize(cursor + s.length);
-        }
-        void* dest = &buffer[cursor];
-        ::memcpy(dest, s.C_Str(), s.length);
-        cursor += s.length;
-    }
-
-    // ---------------------------------------------------------------------
-    /** Write a std::string to the stream */
-    void PutString(const std::string& s)
-    {
-        // as Put(T f) below
-        if (cursor + s.size() >= buffer.size()) {
-            buffer.resize(cursor + s.size());
-        }
-        void* dest = &buffer[cursor];
-        ::memcpy(dest, s.c_str(), s.size());
-        cursor += s.size();
-    }
-
-public:
-
-    // ---------------------------------------------------------------------
-    /** overload operator<< and allow chaining of MM ops. */
-    template <typename T>
-    StreamWriter& operator << (T f) {
-        Put(f);
-        return *this;
-    }
-
-    // ---------------------------------------------------------------------
-    std::size_t GetCurrentPos() const {
-        return cursor;
-    }
-
-    // ---------------------------------------------------------------------
-    void SetCurrentPos(std::size_t new_cursor) {
-        cursor = new_cursor;
-    }
-
-    // ---------------------------------------------------------------------
-    /** Generic write method. ByteSwap::Swap(T*) *must* be defined */
-    template <typename T>
-    void Put(T f)   {
-        Intern :: Getter<SwapEndianess,T,RuntimeSwitch>() (&f, le);
-
-        if (cursor + sizeof(T) >= buffer.size()) {
-            buffer.resize(cursor + sizeof(T));
-        }
-
-        void* dest = &buffer[cursor];
-
-        // reinterpret_cast + assignment breaks strict aliasing rules
-        // and generally causes trouble on platforms such as ARM that
-        // do not silently ignore alignment faults.
-        ::memcpy(dest, &f, sizeof(T));
-        cursor += sizeof(T);
-    }
-
-private:
-
-    std::shared_ptr<IOStream> stream;
-    bool le;
-
-    std::vector<uint8_t> buffer;
-    std::size_t cursor;
-};
-
-
-// --------------------------------------------------------------------------------------------
-// `static` StreamWriter. Their byte order is fixed and they might be a little bit faster.
-#ifdef AI_BUILD_BIG_ENDIAN
-    typedef StreamWriter<true>  StreamWriterLE;
-    typedef StreamWriter<false> StreamWriterBE;
-#else
-    typedef StreamWriter<true>  StreamWriterBE;
-    typedef StreamWriter<false> StreamWriterLE;
-#endif
-
-// `dynamic` StreamWriter. The byte order of the input data is specified in the
-// c'tor. This involves runtime branching and might be a little bit slower.
-typedef StreamWriter<true,true> StreamWriterAny;
-
-} // end namespace Assimp
-
-#endif // !! AI_STREAMWriter_H_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/StringComparison.h b/thirdparty/assimp/include/assimp/StringComparison.h
deleted file mode 100644
index d3ca3e9714..0000000000
--- a/thirdparty/assimp/include/assimp/StringComparison.h
+++ /dev/null
@@ -1,238 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Definition of platform independent string workers:
-
-   ASSIMP_itoa10
-   ASSIMP_stricmp
-   ASSIMP_strincmp
-
-   These functions are not consistently available on all platforms,
-   or the provided implementations behave too differently.
-*/
-#pragma once
-#ifndef INCLUDED_AI_STRING_WORKERS_H
-#define INCLUDED_AI_STRING_WORKERS_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/ai_assert.h>
-#include <assimp/defs.h>
-#include <assimp/StringComparison.h>
-
-#include <string.h>
-#include <stdint.h>
-#include <string>
-
-namespace Assimp    {
-
-// -------------------------------------------------------------------------------
-/** @brief itoa with a fixed base 10
- * 'itoa' is not consistently available on all platforms so it is quite useful
- * to have a small replacement function here. No need to use a full sprintf()
- * if we just want to print a number ...
- * @param out Output buffer
- * @param max Maximum number of characters to be written, including '\0'.
- *   This parameter may not be 0.
- * @param number Number to be written
- * @return Length of the output string, excluding the '\0'
- */
-AI_FORCE_INLINE
-unsigned int ASSIMP_itoa10( char* out, unsigned int max, int32_t number) {
-    ai_assert(NULL != out);
-
-    // write the unary minus to indicate we have a negative number
-    unsigned int written = 1u;
-    if (number < 0 && written < max)    {
-        *out++ = '-';
-        ++written;
-        number = -number;
-    }
-
-    // We begin with the largest number that is not zero.
-    int32_t cur = 1000000000; // 2147483648
-    bool mustPrint = false;
-    while (written < max)   {
-
-        const unsigned int digit = number / cur;
-        if (mustPrint || digit > 0 || 1 == cur) {
-            // print all future zeroe's from now
-            mustPrint = true;
-
-            *out++ = '0'+static_cast<char>(digit);
-
-            ++written;
-            number -= digit*cur;
-            if (1 == cur) {
-                break;
-            }
-        }
-        cur /= 10;
-    }
-
-    // append a terminal zero
-    *out++ = '\0';
-    return written-1;
-}
-
-// -------------------------------------------------------------------------------
-/** @brief itoa with a fixed base 10 (Secure template overload)
- *  The compiler should choose this function if he or she is able to determine the
- *  size of the array automatically.
- */
-template <size_t length>
-AI_FORCE_INLINE
-unsigned int ASSIMP_itoa10( char(& out)[length], int32_t number) {
-    return ASSIMP_itoa10(out,length,number);
-}
-
-// -------------------------------------------------------------------------------
-/** @brief Helper function to do platform independent string comparison.
- *
- *  This is required since stricmp() is not consistently available on
- *  all platforms. Some platforms use the '_' prefix, others don't even
- *  have such a function.
- *
- *  @param s1 First input string
- *  @param s2 Second input string
- *  @return 0 if the given strings are identical
- */
-AI_FORCE_INLINE
-int ASSIMP_stricmp(const char *s1, const char *s2) {
-    ai_assert( NULL != s1 );
-    ai_assert( NULL != s2 );
-
-#if (defined _MSC_VER)
-
-    return ::_stricmp(s1,s2);
-#elif defined( __GNUC__ )
-
-    return ::strcasecmp(s1,s2);
-#else
-
-    char c1, c2;
-    do  {
-        c1 = tolower(*s1++);
-        c2 = tolower(*s2++);
-    }
-    while ( c1 && (c1 == c2) );
-    return c1 - c2;
-#endif
-}
-
-// -------------------------------------------------------------------------------
-/** @brief Case independent comparison of two std::strings
- *
- *  @param a First  string
- *  @param b Second string
- *  @return 0 if a == b
- */
-AI_FORCE_INLINE
-int ASSIMP_stricmp(const std::string& a, const std::string& b) {
-    int i = (int)b.length()-(int)a.length();
-    return (i ? i : ASSIMP_stricmp(a.c_str(),b.c_str()));
-}
-
-// -------------------------------------------------------------------------------
-/** @brief Helper function to do platform independent string comparison.
- *
- *  This is required since strincmp() is not consistently available on
- *  all platforms. Some platforms use the '_' prefix, others don't even
- *  have such a function.
- *
- *  @param s1 First input string
- *  @param s2 Second input string
- *  @param n Macimum number of characters to compare
- *  @return 0 if the given strings are identical
- */
-AI_FORCE_INLINE
-int ASSIMP_strincmp(const char *s1, const char *s2, unsigned int n) {
-    ai_assert( NULL != s1 );
-    ai_assert( NULL != s2 );
-    if ( !n ) {
-        return 0;
-    }
-
-#if (defined _MSC_VER)
-
-    return ::_strnicmp(s1,s2,n);
-
-#elif defined( __GNUC__ )
-
-    return ::strncasecmp(s1,s2, n);
-
-#else
-    char c1, c2;
-    unsigned int p = 0;
-    do
-    {
-        if (p++ >= n)return 0;
-        c1 = tolower(*s1++);
-        c2 = tolower(*s2++);
-    }
-    while ( c1 && (c1 == c2) );
-
-    return c1 - c2;
-#endif
-}
-
-
-// -------------------------------------------------------------------------------
-/** @brief Evaluates an integer power
- *
- * todo: move somewhere where it fits better in than here
- */
-AI_FORCE_INLINE
-unsigned int integer_pow( unsigned int base, unsigned int power ) {
-    unsigned int res = 1;
-    for ( unsigned int i = 0; i < power; ++i ) {
-        res *= base;
-    }
-
-    return res;
-}
-
-} // end of namespace
-
-#endif // !  AI_STRINGCOMPARISON_H_INC
diff --git a/thirdparty/assimp/include/assimp/StringUtils.h b/thirdparty/assimp/include/assimp/StringUtils.h
deleted file mode 100644
index af481f819e..0000000000
--- a/thirdparty/assimp/include/assimp/StringUtils.h
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-#pragma once
-#ifndef INCLUDED_AI_STRINGUTILS_H
-#define INCLUDED_AI_STRINGUTILS_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/defs.h>
-
-#include <sstream>
-#include <stdarg.h>
-#include <cstdlib>
-
-///	@fn		ai_snprintf
-///	@brief	The portable version of the function snprintf ( C99 standard ), which works on visual studio compilers 2013 and earlier.
-///	@param	outBuf		The buffer to write in
-///	@param	size		The buffer size
-///	@param	format		The format string
-///	@param	ap			The additional arguments.
-///	@return	The number of written characters if the buffer size was big enough. If an encoding error occurs, a negative number is returned.
-#if defined(_MSC_VER) && _MSC_VER < 1900
-
-    AI_FORCE_INLINE
-    int c99_ai_vsnprintf(char *outBuf, size_t size, const char *format, va_list ap) {
-		int count(-1);
-		if (0 != size) {
-			count = _vsnprintf_s(outBuf, size, _TRUNCATE, format, ap);
-		}
-		if (count == -1) {
-			count = _vscprintf(format, ap);
-		}
-
-		return count;
-	}
-
-    AI_FORCE_INLINE
-    int ai_snprintf(char *outBuf, size_t size, const char *format, ...) {
-		int count;
-		va_list ap;
-
-		va_start(ap, format);
-		count = c99_ai_vsnprintf(outBuf, size, format, ap);
-		va_end(ap);
-
-		return count;
-	}
-
-#else
-#   define ai_snprintf snprintf
-#endif
-
-///	@fn		to_string
-///	@brief	The portable version of to_string ( some gcc-versions on embedded devices are not supporting this).
-///	@param	value   The value to write into the std::string.
-///	@return	The value as a std::string
-template <typename T>
-AI_FORCE_INLINE
-std::string to_string( T value ) {
-    std::ostringstream os;
-    os << value;
-
-    return os.str();
-}
-
-///	@fn		ai_strtof
-///	@brief	The portable version of strtof.
-///	@param	begin   The first character of the string.
-/// @param  end     The last character
-///	@return	The float value, 0.0f in cas of an error.
-AI_FORCE_INLINE
-float ai_strtof( const char *begin, const char *end ) {
-    if ( nullptr == begin ) {
-        return 0.0f;
-    }
-    float val( 0.0f );
-    if ( nullptr == end ) {
-        val = static_cast< float >( ::atof( begin ) );
-    } else {
-        std::string::size_type len( end - begin );
-        std::string token( begin, len );
-        val = static_cast< float >( ::atof( token.c_str() ) );
-    }
-
-    return val;
-}
-
-///	@fn		DecimalToHexa
-///	@brief	The portable to convert a decimal value into a hexadecimal string.
-///	@param	toConvert   Value to convert
-///	@return	The hexadecimal string, is empty in case of an error.
-template<class T>
-AI_FORCE_INLINE
-std::string DecimalToHexa( T toConvert ) {
-    std::string result;
-    std::stringstream ss;
-    ss << std::hex << toConvert;
-    ss >> result;
-
-    for ( size_t i = 0; i < result.size(); ++i ) {
-        result[ i ] = toupper( result[ i ] );
-    }
-
-    return result;
-}
-
-#endif // INCLUDED_AI_STRINGUTILS_H
diff --git a/thirdparty/assimp/include/assimp/Subdivision.h b/thirdparty/assimp/include/assimp/Subdivision.h
deleted file mode 100644
index e9450267ec..0000000000
--- a/thirdparty/assimp/include/assimp/Subdivision.h
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Defines a helper class to evaluate subdivision surfaces.*/
-#pragma once
-#ifndef AI_SUBDISIVION_H_INC
-#define AI_SUBDISIVION_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-
-struct aiMesh;
-
-namespace Assimp    {
-
-// ------------------------------------------------------------------------------
-/** Helper class to evaluate subdivision surfaces. Different algorithms
- *  are provided for choice. */
-// ------------------------------------------------------------------------------
-class ASSIMP_API Subdivider {
-public:
-
-    /** Enumerates all supported subvidision algorithms */
-    enum Algorithm  {
-        CATMULL_CLARKE = 0x1
-    };
-
-    virtual ~Subdivider();
-
-    // ---------------------------------------------------------------
-    /** Create a subdivider of a specific type
-     *
-     *  @param algo Algorithm to be used for subdivision
-     *  @return Subdivider instance. */
-    static Subdivider* Create (Algorithm algo);
-
-    // ---------------------------------------------------------------
-    /** Subdivide a mesh using the selected algorithm
-     *
-     *  @param mesh First mesh to be subdivided. Must be in verbose
-     *    format.
-     *  @param out Receives the output mesh, allocated by me.
-     *  @param num Number of subdivisions to perform.
-     *  @param discard_input If true is passed, the input mesh is
-     *    deleted after the subdivision is complete. This can
-     *    improve performance because it allows the optimization
-     *    to reuse the existing mesh for intermediate results.
-     *  @pre out!=mesh*/
-    virtual void Subdivide ( aiMesh* mesh,
-        aiMesh*& out, unsigned int num,
-        bool discard_input = false) = 0;
-
-    // ---------------------------------------------------------------
-    /** Subdivide multiple meshes using the selected algorithm. This
-     *  avoids erroneous smoothing on objects consisting of multiple
-     *  per-material meshes. Usually, most 3d modellers smooth on a
-     *  per-object base, regardless the materials assigned to the
-     *  meshes.
-     *
-     *  @param smesh Array of meshes to be subdivided. Must be in
-     *    verbose format.
-     *  @param nmesh Number of meshes in smesh.
-     *  @param out Receives the output meshes. The array must be
-     *    sufficiently large (at least @c nmesh elements) and may not
-     *    overlap the input array. Output meshes map one-to-one to
-     *    their corresponding input meshes. The meshes are allocated
-     *    by the function.
-     *  @param discard_input If true is passed, input meshes are
-     *    deleted after the subdivision is complete. This can
-     *    improve performance because it allows the optimization
-     *    of reusing existing meshes for intermediate results.
-     *  @param num Number of subdivisions to perform.
-     *  @pre nmesh != 0, smesh and out may not overlap*/
-    virtual void Subdivide (
-        aiMesh** smesh,
-        size_t nmesh,
-        aiMesh** out,
-        unsigned int num,
-        bool discard_input = false) = 0;
-
-};
-
-inline
-Subdivider::~Subdivider() {
-    // empty
-}
-
-} // end namespace Assimp
-
-
-#endif // !!  AI_SUBDISIVION_H_INC
-
diff --git a/thirdparty/assimp/include/assimp/TinyFormatter.h b/thirdparty/assimp/include/assimp/TinyFormatter.h
deleted file mode 100644
index 6227e42c52..0000000000
--- a/thirdparty/assimp/include/assimp/TinyFormatter.h
+++ /dev/null
@@ -1,158 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file  TinyFormatter.h
- *  @brief Utility to format log messages more easily. Introduced
- *    to get rid of the boost::format dependency. Much slinker,
- *    basically just extends stringstream.
- */
-#pragma once
-#ifndef INCLUDED_TINY_FORMATTER_H
-#define INCLUDED_TINY_FORMATTER_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <sstream>
-
-namespace Assimp {
-namespace Formatter {
-
-// ------------------------------------------------------------------------------------------------
-/** stringstream utility. Usage:
- *  @code
- *  void writelog(const std::string&s);
- *  void writelog(const std::wstring&s);
- *  ...
- *  writelog(format()<< "hi! this is a number: " << 4);
- *  writelog(wformat()<< L"hi! this is a number: " << 4);
- *
- *  @endcode */
-template < typename T,
-    typename CharTraits = std::char_traits<T>,
-    typename Allocator  = std::allocator<T> >
-class basic_formatter {
-public:
-    typedef class std::basic_string<T,CharTraits,Allocator> string;
-    typedef class std::basic_ostringstream<T,CharTraits,Allocator> stringstream;
-
-    basic_formatter() {
-        // empty
-    }
-
-    /* Allow basic_formatter<T>'s to be used almost interchangeably
-     * with std::(w)string or const (w)char* arguments because the
-     * conversion c'tor is called implicitly. */
-    template <typename TT>
-    basic_formatter(const TT& sin)  {
-        underlying << sin;
-    }
-
-
-    // The problem described here:
-    // https://sourceforge.net/tracker/?func=detail&atid=1067632&aid=3358562&group_id=226462
-    // can also cause trouble here. Apparently, older gcc versions sometimes copy temporaries
-    // being bound to const ref& function parameters. Copying streams is not permitted, though.
-    // This workaround avoids this by manually specifying a copy ctor.
-#if !defined(__GNUC__) || !defined(__APPLE__) || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
-    explicit basic_formatter(const basic_formatter& other) {
-        underlying << (string)other;
-    }
-#endif
-
-    operator string () const {
-        return underlying.str();
-    }
-
-    /* note - this is declared const because binding temporaries does only
-     * work for const references, so many function prototypes will
-     * include const basic_formatter<T>& s but might still want to
-     * modify the formatted string without the need for a full copy.*/
-    template <typename TToken>
-    const basic_formatter& operator << (const TToken& s) const {
-        underlying << s;
-        return *this;
-    }
-
-    template <typename TToken>
-    basic_formatter& operator << (const TToken& s) {
-        underlying << s;
-        return *this;
-    }
-
-
-    // comma operator overloaded as well, choose your preferred way.
-    template <typename TToken>
-    const basic_formatter& operator, (const TToken& s) const {
-        underlying << s;
-        return *this;
-    }
-
-    template <typename TToken>
-    basic_formatter& operator, (const TToken& s) {
-        underlying << s;
-        return *this;
-    }
-
-    // Fix for MSVC8
-    // See https://sourceforge.net/projects/assimp/forums/forum/817654/topic/4372824
-    template <typename TToken>
-    basic_formatter& operator, (TToken& s) {
-        underlying << s;
-        return *this;
-    }
-
-
-private:
-    mutable stringstream underlying;
-};
-
-
-typedef basic_formatter< char > format;
-typedef basic_formatter< wchar_t > wformat;
-
-} // ! namespace Formatter
-
-} // ! namespace Assimp
-
-#endif
diff --git a/thirdparty/assimp/include/assimp/Vertex.h b/thirdparty/assimp/include/assimp/Vertex.h
deleted file mode 100644
index 5e63db5fe4..0000000000
--- a/thirdparty/assimp/include/assimp/Vertex.h
+++ /dev/null
@@ -1,297 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-/** @file Defines a helper class to represent an interleaved vertex
-  along with arithmetic operations to support vertex operations
-  such as subdivision, smoothing etc.
-
-  While the code is kept as general as possible, arithmetic operations
-  that are not currently well-defined (and would cause compile errors
-  due to missing operators in the math library), are commented.
-  */
-#pragma once
-#ifndef AI_VERTEX_H_INC
-#define AI_VERTEX_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/vector3.h>
-#include <assimp/mesh.h>
-#include <assimp/ai_assert.h>
-
-#include <functional>
-
-namespace Assimp    {
-
-    ///////////////////////////////////////////////////////////////////////////
-    // std::plus-family operates on operands with identical types - we need to
-    // support all the (vectype op float) combinations in vector maths.
-    // Providing T(float) would open the way to endless implicit conversions.
-    ///////////////////////////////////////////////////////////////////////////
-    namespace Intern {
-        template <typename T0, typename T1, typename TRES = T0> struct plus {
-            TRES operator() (const T0& t0, const T1& t1) const {
-                return t0+t1;
-            }
-        };
-        template <typename T0, typename T1, typename TRES = T0> struct minus {
-            TRES operator() (const T0& t0, const T1& t1) const {
-                return t0-t1;
-            }
-        };
-        template <typename T0, typename T1, typename TRES = T0> struct multiplies {
-            TRES operator() (const T0& t0, const T1& t1) const {
-                return t0*t1;
-            }
-        };
-        template <typename T0, typename T1, typename TRES = T0> struct divides {
-            TRES operator() (const T0& t0, const T1& t1) const {
-                return t0/t1;
-            }
-        };
-    }
-
-// ------------------------------------------------------------------------------------------------
-/** Intermediate description a vertex with all possible components. Defines a full set of
- *  operators, so you may use such a 'Vertex' in basic arithmetics. All operators are applied
- *  to *all* vertex components equally. This is useful for stuff like interpolation
- *  or subdivision, but won't work if special handling is required for some vertex components. */
-// ------------------------------------------------------------------------------------------------
-class Vertex {
-    friend Vertex operator + (const Vertex&,const Vertex&);
-    friend Vertex operator - (const Vertex&,const Vertex&);
-    friend Vertex operator * (const Vertex&,ai_real);
-    friend Vertex operator / (const Vertex&,ai_real);
-    friend Vertex operator * (ai_real, const Vertex&);
-
-public:
-    Vertex() {}
-
-    // ----------------------------------------------------------------------------
-    /** Extract a particular vertex from a mesh and interleave all components */
-    explicit Vertex(const aiMesh* msh, unsigned int idx) {
-        ai_assert(idx < msh->mNumVertices);
-        position = msh->mVertices[idx];
-
-        if (msh->HasNormals()) {
-            normal = msh->mNormals[idx];
-        }
-
-        if (msh->HasTangentsAndBitangents()) {
-            tangent = msh->mTangents[idx];
-            bitangent = msh->mBitangents[idx];
-        }
-
-        for (unsigned int i = 0; msh->HasTextureCoords(i); ++i) {
-            texcoords[i] = msh->mTextureCoords[i][idx];
-        }
-
-        for (unsigned int i = 0; msh->HasVertexColors(i); ++i) {
-            colors[i] = msh->mColors[i][idx];
-        }
-    }
-
-    // ----------------------------------------------------------------------------
-    /** Extract a particular vertex from a anim mesh and interleave all components */
-    explicit Vertex(const aiAnimMesh* msh, unsigned int idx) {
-        ai_assert(idx < msh->mNumVertices);
-        position = msh->mVertices[idx];
-
-        if (msh->HasNormals()) {
-            normal = msh->mNormals[idx];
-        }
-
-        if (msh->HasTangentsAndBitangents()) {
-            tangent = msh->mTangents[idx];
-            bitangent = msh->mBitangents[idx];
-        }
-
-        for (unsigned int i = 0; msh->HasTextureCoords(i); ++i) {
-            texcoords[i] = msh->mTextureCoords[i][idx];
-        }
-
-        for (unsigned int i = 0; msh->HasVertexColors(i); ++i) {
-           colors[i] = msh->mColors[i][idx];
-        }
-    }
-
-    Vertex& operator += (const Vertex& v) {
-        *this = *this+v;
-        return *this;
-    }
-
-    Vertex& operator -= (const Vertex& v) {
-        *this = *this-v;
-        return *this;
-    }
-
-    Vertex& operator *= (ai_real v) {
-        *this = *this*v;
-        return *this;
-    }
-
-    Vertex& operator /= (ai_real v) {
-        *this = *this/v;
-        return *this;
-    }
-
-    // ----------------------------------------------------------------------------
-    /** Convert back to non-interleaved storage */
-    void SortBack(aiMesh* out, unsigned int idx) const {
-        ai_assert(idx<out->mNumVertices);
-        out->mVertices[idx] = position;
-
-        if (out->HasNormals()) {
-            out->mNormals[idx] = normal;
-        }
-
-        if (out->HasTangentsAndBitangents()) {
-            out->mTangents[idx] = tangent;
-            out->mBitangents[idx] = bitangent;
-        }
-
-        for(unsigned int i = 0; out->HasTextureCoords(i); ++i) {
-            out->mTextureCoords[i][idx] = texcoords[i];
-        }
-
-        for(unsigned int i = 0; out->HasVertexColors(i); ++i) {
-            out->mColors[i][idx] = colors[i];
-        }
-    }
-
-private:
-
-    // ----------------------------------------------------------------------------
-    /** Construct from two operands and a binary operation to combine them */
-    template <template <typename t> class op> static Vertex BinaryOp(const Vertex& v0, const Vertex& v1) {
-        // this is a heavy task for the compiler to optimize ... *pray*
-
-        Vertex res;
-        res.position  = op<aiVector3D>()(v0.position,v1.position);
-        res.normal    = op<aiVector3D>()(v0.normal,v1.normal);
-        res.tangent   = op<aiVector3D>()(v0.tangent,v1.tangent);
-        res.bitangent = op<aiVector3D>()(v0.bitangent,v1.bitangent);
-
-        for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
-            res.texcoords[i] = op<aiVector3D>()(v0.texcoords[i],v1.texcoords[i]);
-        }
-        for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
-            res.colors[i] = op<aiColor4D>()(v0.colors[i],v1.colors[i]);
-        }
-        return res;
-    }
-
-    // ----------------------------------------------------------------------------
-    /** This time binary arithmetics of v0 with a floating-point number */
-    template <template <typename, typename, typename> class op> static Vertex BinaryOp(const Vertex& v0, ai_real f) {
-        // this is a heavy task for the compiler to optimize ... *pray*
-
-        Vertex res;
-        res.position  = op<aiVector3D,ai_real,aiVector3D>()(v0.position,f);
-        res.normal    = op<aiVector3D,ai_real,aiVector3D>()(v0.normal,f);
-        res.tangent   = op<aiVector3D,ai_real,aiVector3D>()(v0.tangent,f);
-        res.bitangent = op<aiVector3D,ai_real,aiVector3D>()(v0.bitangent,f);
-
-        for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
-            res.texcoords[i] = op<aiVector3D,ai_real,aiVector3D>()(v0.texcoords[i],f);
-        }
-        for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
-            res.colors[i] = op<aiColor4D,ai_real,aiColor4D>()(v0.colors[i],f);
-        }
-        return res;
-    }
-
-    // ----------------------------------------------------------------------------
-    /** This time binary arithmetics of v0 with a floating-point number */
-    template <template <typename, typename, typename> class op> static Vertex BinaryOp(ai_real f, const Vertex& v0) {
-        // this is a heavy task for the compiler to optimize ... *pray*
-
-        Vertex res;
-        res.position  = op<ai_real,aiVector3D,aiVector3D>()(f,v0.position);
-        res.normal    = op<ai_real,aiVector3D,aiVector3D>()(f,v0.normal);
-        res.tangent   = op<ai_real,aiVector3D,aiVector3D>()(f,v0.tangent);
-        res.bitangent = op<ai_real,aiVector3D,aiVector3D>()(f,v0.bitangent);
-
-        for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++i) {
-            res.texcoords[i] = op<ai_real,aiVector3D,aiVector3D>()(f,v0.texcoords[i]);
-        }
-        for (unsigned int i = 0; i < AI_MAX_NUMBER_OF_COLOR_SETS; ++i) {
-            res.colors[i] = op<ai_real,aiColor4D,aiColor4D>()(f,v0.colors[i]);
-        }
-        return res;
-    }
-
-public:
-
-    aiVector3D position;
-    aiVector3D normal;
-    aiVector3D tangent, bitangent;
-
-    aiVector3D texcoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
-    aiColor4D colors[AI_MAX_NUMBER_OF_COLOR_SETS];
-};
-
-// ------------------------------------------------------------------------------------------------
-AI_FORCE_INLINE Vertex operator + (const Vertex& v0,const Vertex& v1) {
-    return Vertex::BinaryOp<std::plus>(v0,v1);
-}
-
-AI_FORCE_INLINE Vertex operator - (const Vertex& v0,const Vertex& v1) {
-    return Vertex::BinaryOp<std::minus>(v0,v1);
-}
-
-AI_FORCE_INLINE Vertex operator * (const Vertex& v0,ai_real f) {
-    return Vertex::BinaryOp<Intern::multiplies>(v0,f);
-}
-
-AI_FORCE_INLINE Vertex operator / (const Vertex& v0,ai_real f) {
-    return Vertex::BinaryOp<Intern::multiplies>(v0,1.f/f);
-}
-
-AI_FORCE_INLINE Vertex operator * (ai_real f,const Vertex& v0) {
-    return Vertex::BinaryOp<Intern::multiplies>(f,v0);
-}
-
-}
-
-#endif // AI_VERTEX_H_INC
diff --git a/thirdparty/assimp/include/assimp/XMLTools.h b/thirdparty/assimp/include/assimp/XMLTools.h
deleted file mode 100644
index 95f12cdebf..0000000000
--- a/thirdparty/assimp/include/assimp/XMLTools.h
+++ /dev/null
@@ -1,88 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-#pragma once
-#ifndef INCLUDED_ASSIMP_XML_TOOLS_H
-#define INCLUDED_ASSIMP_XML_TOOLS_H
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <string>
-
-namespace Assimp {
-    // XML escape the 5 XML special characters (",',<,> and &) in |data|
-    // Based on http://stackoverflow.com/questions/5665231
-    std::string XMLEscape(const std::string& data) {
-        std::string buffer;
-
-        const size_t size = data.size();
-        buffer.reserve(size + size / 8);
-        for(size_t i = 0; i < size; ++i) {
-            const char c = data[i];
-            switch(c) {
-                case '&' :
-                    buffer.append("&amp;");
-                    break;
-                case '\"':
-                    buffer.append("&quot;");
-                    break;
-                case '\'':
-                    buffer.append("&apos;");
-                    break;
-                case '<' :
-                    buffer.append("&lt;");
-                    break;
-                case '>' :
-                    buffer.append("&gt;");
-                    break;
-                default:
-                    buffer.append(&c, 1);
-                    break;
-            }
-        }
-        return buffer;
-    }
-}
-
-#endif // INCLUDED_ASSIMP_XML_TOOLS_H
diff --git a/thirdparty/assimp/include/assimp/aabb.h b/thirdparty/assimp/include/assimp/aabb.h
deleted file mode 100644
index 83bb62256b..0000000000
--- a/thirdparty/assimp/include/assimp/aabb.h
+++ /dev/null
@@ -1,79 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-#pragma once
-#ifndef AI_AABB_H_INC
-#define AI_AABB_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/vector3.h>
-
-struct aiAABB {
-    C_STRUCT aiVector3D mMin;
-    C_STRUCT aiVector3D mMax;
-
-#ifdef __cplusplus
-
-    aiAABB()
-    : mMin()
-    , mMax() {
-        // empty
-    }
-
-    aiAABB(const aiVector3D &min, const aiVector3D &max )
-    : mMin(min)
-    , mMax(max) {
-        // empty
-    }
-
-    ~aiAABB() {
-        // empty
-    }
-
-#endif // __cplusplus
-
-};
-
-
-#endif // AI_AABB_H_INC
diff --git a/thirdparty/assimp/include/assimp/ai_assert.h b/thirdparty/assimp/include/assimp/ai_assert.h
deleted file mode 100644
index 2b32b01d3e..0000000000
--- a/thirdparty/assimp/include/assimp/ai_assert.h
+++ /dev/null
@@ -1,61 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-#pragma once
-#ifndef AI_ASSERT_H_INC
-#define AI_ASSERT_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef ASSIMP_BUILD_DEBUG
-#   include <assert.h>
-#   define ai_assert(expression) assert( expression )
-#   define ai_assert_entry()     assert( false )
-#else
-#   define  ai_assert(expression)
-#   define  ai_assert_entry() 
-#endif // ASSIMP_BUILD_DEBUG
-
-#endif // AI_ASSERT_H_INC
-
diff --git a/thirdparty/assimp/include/assimp/anim.h b/thirdparty/assimp/include/assimp/anim.h
deleted file mode 100644
index e208b11adb..0000000000
--- a/thirdparty/assimp/include/assimp/anim.h
+++ /dev/null
@@ -1,581 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** 
-  * @file   anim.h
-  * @brief  Defines the data structures in which the imported animations
-  *         are returned.
-  */
-#pragma once
-#ifndef AI_ANIM_H_INC
-#define AI_ANIM_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-#include <assimp/quaternion.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-/** A time-value pair specifying a certain 3D vector for the given time. */
-struct aiVectorKey
-{
-    /** The time of this key */
-    double mTime;
-
-    /** The value of this key */
-    C_STRUCT aiVector3D mValue;
-
-#ifdef __cplusplus
-
-    /// @brief  The default constructor.
-    aiVectorKey() AI_NO_EXCEPT
-    : mTime( 0.0 )
-    , mValue() {
-        // empty
-    }
-
-    /// @brief  Construction from a given time and key value.
-
-    aiVectorKey(double time, const aiVector3D& value)
-    : mTime( time )
-    , mValue( value ) {
-        // empty
-    }
-
-    typedef aiVector3D elem_type;
-
-    // Comparison operators. For use with std::find();
-    bool operator == (const aiVectorKey& rhs) const {
-        return rhs.mValue == this->mValue;
-    }
-    bool operator != (const aiVectorKey& rhs ) const {
-        return rhs.mValue != this->mValue;
-    }
-
-    // Relational operators. For use with std::sort();
-    bool operator < (const aiVectorKey& rhs ) const {
-        return mTime < rhs.mTime;
-    }
-    bool operator > (const aiVectorKey& rhs ) const {
-        return mTime > rhs.mTime;
-    }
-#endif // __cplusplus
-};
-
-// ---------------------------------------------------------------------------
-/** A time-value pair specifying a rotation for the given time.
- *  Rotations are expressed with quaternions. */
-struct aiQuatKey
-{
-    /** The time of this key */
-    double mTime;
-
-    /** The value of this key */
-    C_STRUCT aiQuaternion mValue;
-
-#ifdef __cplusplus
-    aiQuatKey() AI_NO_EXCEPT
-    : mTime( 0.0 )
-    , mValue() {
-        // empty
-    }
-
-    /** Construction from a given time and key value */
-    aiQuatKey(double time, const aiQuaternion& value)
-        :   mTime   (time)
-        ,   mValue  (value)
-    {}
-
-    typedef aiQuaternion elem_type;
-
-    // Comparison operators. For use with std::find();
-    bool operator == (const aiQuatKey& rhs ) const {
-        return rhs.mValue == this->mValue;
-    }
-    bool operator != (const aiQuatKey& rhs ) const {
-        return rhs.mValue != this->mValue;
-    }
-
-    // Relational operators. For use with std::sort();
-    bool operator < (const aiQuatKey& rhs ) const {
-        return mTime < rhs.mTime;
-    }
-    bool operator > (const aiQuatKey& rhs ) const {
-        return mTime > rhs.mTime;
-    }
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** Binds a anim-mesh to a specific point in time. */
-struct aiMeshKey
-{
-    /** The time of this key */
-    double mTime;
-
-    /** Index into the aiMesh::mAnimMeshes array of the
-     *  mesh corresponding to the #aiMeshAnim hosting this
-     *  key frame. The referenced anim mesh is evaluated
-     *  according to the rules defined in the docs for #aiAnimMesh.*/
-    unsigned int mValue;
-
-#ifdef __cplusplus
-
-    aiMeshKey() AI_NO_EXCEPT
-    : mTime(0.0)
-    , mValue(0)
-    {
-    }
-
-    /** Construction from a given time and key value */
-    aiMeshKey(double time, const unsigned int value)
-        :   mTime   (time)
-        ,   mValue  (value)
-    {}
-
-    typedef unsigned int elem_type;
-
-    // Comparison operators. For use with std::find();
-    bool operator == (const aiMeshKey& o) const {
-        return o.mValue == this->mValue;
-    }
-    bool operator != (const aiMeshKey& o) const {
-        return o.mValue != this->mValue;
-    }
-
-    // Relational operators. For use with std::sort();
-    bool operator < (const aiMeshKey& o) const {
-        return mTime < o.mTime;
-    }
-    bool operator > (const aiMeshKey& o) const {
-        return mTime > o.mTime;
-    }
-
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** Binds a morph anim mesh to a specific point in time. */
-struct aiMeshMorphKey
-{
-    /** The time of this key */
-    double mTime;
-
-    /** The values and weights at the time of this key */
-    unsigned int *mValues;
-    double *mWeights;
-
-    /** The number of values and weights */
-    unsigned int mNumValuesAndWeights;
-#ifdef __cplusplus
-	aiMeshMorphKey() AI_NO_EXCEPT
-		: mTime(0.0)
-		, mValues(nullptr)
-		, mWeights(nullptr)
-		, mNumValuesAndWeights(0)
-	{
-
-	}
-
-    ~aiMeshMorphKey()
-    {
-        if (mNumValuesAndWeights && mValues && mWeights) {
-            delete [] mValues;
-            delete [] mWeights;
-        }
-    }
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** Defines how an animation channel behaves outside the defined time
- *  range. This corresponds to aiNodeAnim::mPreState and
- *  aiNodeAnim::mPostState.*/
-enum aiAnimBehaviour
-{
-    /** The value from the default node transformation is taken*/
-    aiAnimBehaviour_DEFAULT  = 0x0,
-
-    /** The nearest key value is used without interpolation */
-    aiAnimBehaviour_CONSTANT = 0x1,
-
-    /** The value of the nearest two keys is linearly
-     *  extrapolated for the current time value.*/
-    aiAnimBehaviour_LINEAR   = 0x2,
-
-    /** The animation is repeated.
-     *
-     *  If the animation key go from n to m and the current
-     *  time is t, use the value at (t-n) % (|m-n|).*/
-    aiAnimBehaviour_REPEAT   = 0x3,
-
-    /** This value is not used, it is just here to force the
-     *  the compiler to map this enum to a 32 Bit integer  */
-#ifndef SWIG
-    _aiAnimBehaviour_Force32Bit = INT_MAX
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** Describes the animation of a single node. The name specifies the
- *  bone/node which is affected by this animation channel. The keyframes
- *  are given in three separate series of values, one each for position,
- *  rotation and scaling. The transformation matrix computed from these
- *  values replaces the node's original transformation matrix at a
- *  specific time.
- *  This means all keys are absolute and not relative to the bone default pose.
- *  The order in which the transformations are applied is
- *  - as usual - scaling, rotation, translation.
- *
- *  @note All keys are returned in their correct, chronological order.
- *  Duplicate keys don't pass the validation step. Most likely there
- *  will be no negative time values, but they are not forbidden also ( so
- *  implementations need to cope with them! ) */
-struct aiNodeAnim {
-    /** The name of the node affected by this animation. The node
-     *  must exist and it must be unique.*/
-    C_STRUCT aiString mNodeName;
-
-    /** The number of position keys */
-    unsigned int mNumPositionKeys;
-
-    /** The position keys of this animation channel. Positions are
-     * specified as 3D vector. The array is mNumPositionKeys in size.
-     *
-     * If there are position keys, there will also be at least one
-     * scaling and one rotation key.*/
-    C_STRUCT aiVectorKey* mPositionKeys;
-
-    /** The number of rotation keys */
-    unsigned int mNumRotationKeys;
-
-    /** The rotation keys of this animation channel. Rotations are
-     *  given as quaternions,  which are 4D vectors. The array is
-     *  mNumRotationKeys in size.
-     *
-     * If there are rotation keys, there will also be at least one
-     * scaling and one position key. */
-    C_STRUCT aiQuatKey* mRotationKeys;
-
-    /** The number of scaling keys */
-    unsigned int mNumScalingKeys;
-
-    /** The scaling keys of this animation channel. Scalings are
-     *  specified as 3D vector. The array is mNumScalingKeys in size.
-     *
-     * If there are scaling keys, there will also be at least one
-     * position and one rotation key.*/
-    C_STRUCT aiVectorKey* mScalingKeys;
-
-    /** Defines how the animation behaves before the first
-     *  key is encountered.
-     *
-     *  The default value is aiAnimBehaviour_DEFAULT (the original
-     *  transformation matrix of the affected node is used).*/
-    C_ENUM aiAnimBehaviour mPreState;
-
-    /** Defines how the animation behaves after the last
-     *  key was processed.
-     *
-     *  The default value is aiAnimBehaviour_DEFAULT (the original
-     *  transformation matrix of the affected node is taken).*/
-    C_ENUM aiAnimBehaviour mPostState;
-
-#ifdef __cplusplus
-    aiNodeAnim() AI_NO_EXCEPT
-    : mNumPositionKeys( 0 )
-    , mPositionKeys( nullptr )
-    , mNumRotationKeys( 0 )
-    , mRotationKeys( nullptr )
-    , mNumScalingKeys( 0 )
-    , mScalingKeys( nullptr )
-    , mPreState( aiAnimBehaviour_DEFAULT )
-    , mPostState( aiAnimBehaviour_DEFAULT ) {
-         // empty
-    }
-
-    ~aiNodeAnim() {
-        delete [] mPositionKeys;
-        delete [] mRotationKeys;
-        delete [] mScalingKeys;
-    }
-#endif // __cplusplus
-};
-
-// ---------------------------------------------------------------------------
-/** Describes vertex-based animations for a single mesh or a group of
- *  meshes. Meshes carry the animation data for each frame in their
- *  aiMesh::mAnimMeshes array. The purpose of aiMeshAnim is to
- *  define keyframes linking each mesh attachment to a particular
- *  point in time. */
-struct aiMeshAnim
-{
-    /** Name of the mesh to be animated. An empty string is not allowed,
-     *  animated meshes need to be named (not necessarily uniquely,
-     *  the name can basically serve as wild-card to select a group
-     *  of meshes with similar animation setup)*/
-    C_STRUCT aiString mName;
-
-    /** Size of the #mKeys array. Must be 1, at least. */
-    unsigned int mNumKeys;
-
-    /** Key frames of the animation. May not be NULL. */
-    C_STRUCT aiMeshKey* mKeys;
-
-#ifdef __cplusplus
-
-    aiMeshAnim() AI_NO_EXCEPT
-        : mNumKeys()
-        , mKeys()
-    {}
-
-    ~aiMeshAnim()
-    {
-        delete[] mKeys;
-    }
-
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** Describes a morphing animation of a given mesh. */
-struct aiMeshMorphAnim
-{
-    /** Name of the mesh to be animated. An empty string is not allowed,
-     *  animated meshes need to be named (not necessarily uniquely,
-     *  the name can basically serve as wildcard to select a group
-     *  of meshes with similar animation setup)*/
-    C_STRUCT aiString mName;
-
-    /** Size of the #mKeys array. Must be 1, at least. */
-    unsigned int mNumKeys;
-
-    /** Key frames of the animation. May not be NULL. */
-    C_STRUCT aiMeshMorphKey* mKeys;
-
-#ifdef __cplusplus
-
-    aiMeshMorphAnim() AI_NO_EXCEPT
-        : mNumKeys()
-        , mKeys()
-    {}
-
-    ~aiMeshMorphAnim()
-    {
-        delete[] mKeys;
-    }
-
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** An animation consists of key-frame data for a number of nodes. For
- *  each node affected by the animation a separate series of data is given.*/
-struct aiAnimation {
-    /** The name of the animation. If the modeling package this data was
-     *  exported from does support only a single animation channel, this
-     *  name is usually empty (length is zero). */
-    C_STRUCT aiString mName;
-
-    /** Duration of the animation in ticks.  */
-    double mDuration;
-
-    /** Ticks per second. 0 if not specified in the imported file */
-    double mTicksPerSecond;
-
-    /** The number of bone animation channels. Each channel affects
-     *  a single node. */
-    unsigned int mNumChannels;
-
-    /** The node animation channels. Each channel affects a single node.
-     *  The array is mNumChannels in size. */
-    C_STRUCT aiNodeAnim** mChannels;
-
-
-    /** The number of mesh animation channels. Each channel affects
-     *  a single mesh and defines vertex-based animation. */
-    unsigned int mNumMeshChannels;
-
-    /** The mesh animation channels. Each channel affects a single mesh.
-     *  The array is mNumMeshChannels in size. */
-    C_STRUCT aiMeshAnim** mMeshChannels;
-
-    /** The number of mesh animation channels. Each channel affects
-     *  a single mesh and defines morphing animation. */
-    unsigned int mNumMorphMeshChannels;
-
-    /** The morph mesh animation channels. Each channel affects a single mesh.
-     *  The array is mNumMorphMeshChannels in size. */
-    C_STRUCT aiMeshMorphAnim **mMorphMeshChannels;
-
-#ifdef __cplusplus
-    aiAnimation() AI_NO_EXCEPT
-    : mDuration(-1.)
-    , mTicksPerSecond(0.)
-    , mNumChannels(0)
-    , mChannels(nullptr)
-    , mNumMeshChannels(0)
-    , mMeshChannels(nullptr)
-    , mNumMorphMeshChannels(0)
-    , mMorphMeshChannels(nullptr) {
-        // empty
-    }
-
-    ~aiAnimation() {
-        // DO NOT REMOVE THIS ADDITIONAL CHECK
-        if ( mNumChannels && mChannels )  {
-            for( unsigned int a = 0; a < mNumChannels; a++) {
-                delete mChannels[ a ];
-            }
-
-            delete [] mChannels;
-        }
-        if (mNumMeshChannels && mMeshChannels)  {
-            for( unsigned int a = 0; a < mNumMeshChannels; a++) {
-                delete mMeshChannels[a];
-            }
-
-            delete [] mMeshChannels;
-        }
-        if (mNumMorphMeshChannels && mMorphMeshChannels) {
-                for( unsigned int a = 0; a < mNumMorphMeshChannels; a++) {
-                        delete mMorphMeshChannels[a];
-                }
-            
-            delete [] mMorphMeshChannels;
-        }
-    }
-#endif // __cplusplus
-};
-
-#ifdef __cplusplus
-
-}
-
-/// @brief  Some C++ utilities for inter- and extrapolation
-namespace Assimp {
-
-// ---------------------------------------------------------------------------
-/** 
-  * @brief CPP-API: Utility class to simplify interpolations of various data types.
-  *
-  *  The type of interpolation is chosen automatically depending on the
-  *  types of the arguments. 
-  */
-template <typename T>
-struct Interpolator
-{
-    // ------------------------------------------------------------------
-    /** @brief Get the result of the interpolation between a,b.
-     *
-     *  The interpolation algorithm depends on the type of the operands.
-     *  aiQuaternion's and aiQuatKey's SLERP, the rest does a simple
-     *  linear interpolation. */
-    void operator () (T& out,const T& a, const T& b, ai_real d) const {
-        out = a + (b-a)*d;
-    }
-}; // ! Interpolator <T>
-
-//! @cond Never
-
-template <>
-struct Interpolator <aiQuaternion>  {
-    void operator () (aiQuaternion& out,const aiQuaternion& a,
-        const aiQuaternion& b, ai_real d) const
-    {
-        aiQuaternion::Interpolate(out,a,b,d);
-    }
-}; // ! Interpolator <aiQuaternion>
-
-template <>
-struct Interpolator <unsigned int>  {
-    void operator () (unsigned int& out,unsigned int a,
-        unsigned int b, ai_real d) const
-    {
-        out = d>0.5f ? b : a;
-    }
-}; // ! Interpolator <aiQuaternion>
-
-template <>
-struct Interpolator<aiVectorKey>  {
-    void operator () (aiVector3D& out,const aiVectorKey& a,
-        const aiVectorKey& b, ai_real d) const
-    {
-        Interpolator<aiVector3D> ipl;
-        ipl(out,a.mValue,b.mValue,d);
-    }
-}; // ! Interpolator <aiVectorKey>
-
-template <>
-struct Interpolator<aiQuatKey>  {
-    void operator () (aiQuaternion& out, const aiQuatKey& a,
-        const aiQuatKey& b, ai_real d) const
-    {
-        Interpolator<aiQuaternion> ipl;
-        ipl(out,a.mValue,b.mValue,d);
-    }
-}; // ! Interpolator <aiQuatKey>
-
-template <>
-struct Interpolator<aiMeshKey>     {
-    void operator () (unsigned int& out, const aiMeshKey& a,
-        const aiMeshKey& b, ai_real d) const
-    {
-        Interpolator<unsigned int> ipl;
-        ipl(out,a.mValue,b.mValue,d);
-    }
-}; // ! Interpolator <aiQuatKey>
-
-//! @endcond
-
-} //  ! end namespace Assimp
-
-#endif // __cplusplus
-
-#endif // AI_ANIM_H_INC
diff --git a/thirdparty/assimp/include/assimp/camera.h b/thirdparty/assimp/include/assimp/camera.h
deleted file mode 100644
index adb749ff59..0000000000
--- a/thirdparty/assimp/include/assimp/camera.h
+++ /dev/null
@@ -1,225 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file camera.h
- *  @brief Defines the aiCamera data structure
- */
-
-#pragma once
-#ifndef AI_CAMERA_H_INC
-#define AI_CAMERA_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include "types.h"
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-/** Helper structure to describe a virtual camera.
- *
- * Cameras have a representation in the node graph and can be animated.
- * An important aspect is that the camera itself is also part of the
- * scene-graph. This means, any values such as the look-at vector are not
- * *absolute*, they're <b>relative</b> to the coordinate system defined
- * by the node which corresponds to the camera. This allows for camera
- * animations. For static cameras parameters like the 'look-at' or 'up' vectors
- * are usually specified directly in aiCamera, but beware, they could also
- * be encoded in the node transformation. The following (pseudo)code sample
- * shows how to do it: <br><br>
- * @code
- * // Get the camera matrix for a camera at a specific time
- * // if the node hierarchy for the camera does not contain
- * // at least one animated node this is a static computation
- * get-camera-matrix (node sceneRoot, camera cam) : matrix
- * {
- *    node   cnd = find-node-for-camera(cam)
- *    matrix cmt = identity()
- *
- *    // as usual - get the absolute camera transformation for this frame
- *    for each node nd in hierarchy from sceneRoot to cnd
- *      matrix cur
- *      if (is-animated(nd))
- *         cur = eval-animation(nd)
- *      else cur = nd->mTransformation;
- *      cmt = mult-matrices( cmt, cur )
- *    end for
- *
- *    // now multiply with the camera's own local transform
- *    cam = mult-matrices (cam, get-camera-matrix(cmt) )
- * }
- * @endcode
- *
- * @note some file formats (such as 3DS, ASE) export a "target point" -
- * the point the camera is looking at (it can even be animated). Assimp
- * writes the target point as a subnode of the camera's main node,
- * called "<camName>.Target". However this is just additional information
- * then the transformation tracks of the camera main node make the
- * camera already look in the right direction.
- *
-*/
-struct aiCamera
-{
-    /** The name of the camera.
-     *
-     *  There must be a node in the scenegraph with the same name.
-     *  This node specifies the position of the camera in the scene
-     *  hierarchy and can be animated.
-     */
-    C_STRUCT aiString mName;
-
-    /** Position of the camera relative to the coordinate space
-     *  defined by the corresponding node.
-     *
-     *  The default value is 0|0|0.
-     */
-    C_STRUCT aiVector3D mPosition;
-
-    /** 'Up' - vector of the camera coordinate system relative to
-     *  the coordinate space defined by the corresponding node.
-     *
-     *  The 'right' vector of the camera coordinate system is
-     *  the cross product of  the up and lookAt vectors.
-     *  The default value is 0|1|0. The vector
-     *  may be normalized, but it needn't.
-     */
-    C_STRUCT aiVector3D mUp;
-
-
-    /** 'LookAt' - vector of the camera coordinate system relative to
-     *  the coordinate space defined by the corresponding node.
-     *
-     *  This is the viewing direction of the user.
-     *  The default value is 0|0|1. The vector
-     *  may be normalized, but it needn't.
-     */
-    C_STRUCT aiVector3D mLookAt;
-
-    /** Half horizontal field of view angle, in radians.
-     *
-     *  The field of view angle is the angle between the center
-     *  line of the screen and the left or right border.
-     *  The default value is 1/4PI.
-     */
-    float mHorizontalFOV;
-
-    /** Distance of the near clipping plane from the camera.
-     *
-     * The value may not be 0.f (for arithmetic reasons to prevent
-     * a division through zero). The default value is 0.1f.
-     */
-    float mClipPlaneNear;
-
-    /** Distance of the far clipping plane from the camera.
-     *
-     * The far clipping plane must, of course, be further away than the
-     * near clipping plane. The default value is 1000.f. The ratio
-     * between the near and the far plane should not be too
-     * large (between 1000-10000 should be ok) to avoid floating-point
-     * inaccuracies which could lead to z-fighting.
-     */
-    float mClipPlaneFar;
-
-    /** Screen aspect ratio.
-     *
-     * This is the ration between the width and the height of the
-     * screen. Typical values are 4/3, 1/2 or 1/1. This value is
-     * 0 if the aspect ratio is not defined in the source file.
-     * 0 is also the default value.
-     */
-    float mAspect;
-
-#ifdef __cplusplus
-
-    aiCamera() AI_NO_EXCEPT
-        : mUp               (0.f,1.f,0.f)
-        , mLookAt           (0.f,0.f,1.f)
-        , mHorizontalFOV    (0.25f * (float)AI_MATH_PI)
-        , mClipPlaneNear    (0.1f)
-        , mClipPlaneFar     (1000.f)
-        , mAspect           (0.f)
-    {}
-
-    /** @brief Get a *right-handed* camera matrix from me
-     *  @param out Camera matrix to be filled
-     */
-    void GetCameraMatrix (aiMatrix4x4& out) const
-    {
-        /** todo: test ... should work, but i'm not absolutely sure */
-
-        /** We don't know whether these vectors are already normalized ...*/
-        aiVector3D zaxis = mLookAt;     zaxis.Normalize();
-        aiVector3D yaxis = mUp;         yaxis.Normalize();
-        aiVector3D xaxis = mUp^mLookAt; xaxis.Normalize();
-
-        out.a4 = -(xaxis * mPosition);
-        out.b4 = -(yaxis * mPosition);
-        out.c4 = -(zaxis * mPosition);
-
-        out.a1 = xaxis.x;
-        out.a2 = xaxis.y;
-        out.a3 = xaxis.z;
-
-        out.b1 = yaxis.x;
-        out.b2 = yaxis.y;
-        out.b3 = yaxis.z;
-
-        out.c1 = zaxis.x;
-        out.c2 = zaxis.y;
-        out.c3 = zaxis.z;
-
-        out.d1 = out.d2 = out.d3 = 0.f;
-        out.d4 = 1.f;
-    }
-
-#endif
-};
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // AI_CAMERA_H_INC
diff --git a/thirdparty/assimp/include/assimp/cexport.h b/thirdparty/assimp/include/assimp/cexport.h
deleted file mode 100644
index cbc0253d50..0000000000
--- a/thirdparty/assimp/include/assimp/cexport.h
+++ /dev/null
@@ -1,265 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-copyright notice, this list of conditions and the
-following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-copyright notice, this list of conditions and the
-following disclaimer in the documentation and/or other
-materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-contributors may be used to endorse or promote products
-derived from this software without specific prior
-written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  cexport.h
-*  @brief Defines the C-API for the Assimp export interface
-*/
-#pragma once
-#ifndef AI_EXPORT_H_INC
-#define AI_EXPORT_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifndef ASSIMP_BUILD_NO_EXPORT
-
-// Public ASSIMP data structures
-#include <assimp/types.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct aiScene;  // aiScene.h
-struct aiFileIO; // aiFileIO.h
-
-// --------------------------------------------------------------------------------
-/** Describes an file format which Assimp can export to. Use #aiGetExportFormatCount() to
-* learn how many export formats the current Assimp build supports and #aiGetExportFormatDescription()
-* to retrieve a description of an export format option.
-*/
-struct aiExportFormatDesc
-{
-    /// a short string ID to uniquely identify the export format. Use this ID string to
-    /// specify which file format you want to export to when calling #aiExportScene().
-    /// Example: "dae" or "obj"
-    const char* id;
-
-    /// A short description of the file format to present to users. Useful if you want
-    /// to allow the user to select an export format.
-    const char* description;
-
-    /// Recommended file extension for the exported file in lower case.
-    const char* fileExtension;
-};
-
-
-// --------------------------------------------------------------------------------
-/** Returns the number of export file formats available in the current Assimp build.
- * Use aiGetExportFormatDescription() to retrieve infos of a specific export format.
- */
-ASSIMP_API size_t aiGetExportFormatCount(void);
-
-// --------------------------------------------------------------------------------
-/** Returns a description of the nth export file format. Use #aiGetExportFormatCount()
- * to learn how many export formats are supported. The description must be released by
- * calling aiReleaseExportFormatDescription afterwards.
- * @param pIndex Index of the export format to retrieve information for. Valid range is
- *    0 to #aiGetExportFormatCount()
- * @return A description of that specific export format. NULL if pIndex is out of range.
- */
-ASSIMP_API const C_STRUCT aiExportFormatDesc* aiGetExportFormatDescription( size_t pIndex);
-
-// --------------------------------------------------------------------------------
-/** Release a description of the nth export file format. Must be returned by
-* aiGetExportFormatDescription
-* @param desc Pointer to the description
-*/
-ASSIMP_API void aiReleaseExportFormatDescription( const C_STRUCT aiExportFormatDesc *desc );
-
-// --------------------------------------------------------------------------------
-/** Create a modifiable copy of a scene.
- *  This is useful to import files via Assimp, change their topology and
- *  export them again. Since the scene returned by the various importer functions
- *  is const, a modifiable copy is needed.
- *  @param pIn Valid scene to be copied
- *  @param pOut Receives a modifyable copy of the scene. Use aiFreeScene() to
- *    delete it again.
- */
-ASSIMP_API void aiCopyScene(const C_STRUCT aiScene* pIn,
-    C_STRUCT aiScene** pOut);
-
-
-// --------------------------------------------------------------------------------
-/** Frees a scene copy created using aiCopyScene() */
-ASSIMP_API void aiFreeScene(const C_STRUCT aiScene* pIn);
-
-// --------------------------------------------------------------------------------
-/** Exports the given scene to a chosen file format and writes the result file(s) to disk.
-* @param pScene The scene to export. Stays in possession of the caller, is not changed by the function.
-*   The scene is expected to conform to Assimp's Importer output format as specified
-*   in the @link data Data Structures Page @endlink. In short, this means the model data
-*   should use a right-handed coordinate systems, face winding should be counter-clockwise
-*   and the UV coordinate origin is assumed to be in the upper left. If your input data
-*   uses different conventions, have a look at the last parameter.
-* @param pFormatId ID string to specify to which format you want to export to. Use
-* aiGetExportFormatCount() / aiGetExportFormatDescription() to learn which export formats are available.
-* @param pFileName Output file to write
-* @param pPreprocessing Accepts any choice of the #aiPostProcessSteps enumerated
-*   flags, but in reality only a subset of them makes sense here. Specifying
-*   'preprocessing' flags is useful if the input scene does not conform to
-*   Assimp's default conventions as specified in the @link data Data Structures Page @endlink.
-*   In short, this means the geometry data should use a right-handed coordinate systems, face
-*   winding should be counter-clockwise and the UV coordinate origin is assumed to be in
-*   the upper left. The #aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
-*   #aiProcess_FlipWindingOrder flags are used in the import side to allow users
-*   to have those defaults automatically adapted to their conventions. Specifying those flags
-*   for exporting has the opposite effect, respectively. Some other of the
-*   #aiPostProcessSteps enumerated values may be useful as well, but you'll need
-*   to try out what their effect on the exported file is. Many formats impose
-*   their own restrictions on the structure of the geometry stored therein,
-*   so some preprocessing may have little or no effect at all, or may be
-*   redundant as exporters would apply them anyhow. A good example
-*   is triangulation - whilst you can enforce it by specifying
-*   the #aiProcess_Triangulate flag, most export formats support only
-*   triangulate data so they would run the step anyway.
-*
-*   If assimp detects that the input scene was directly taken from the importer side of
-*   the library (i.e. not copied using aiCopyScene and potetially modified afterwards),
-*   any postprocessing steps already applied to the scene will not be applied again, unless
-*   they show non-idempotent behaviour (#aiProcess_MakeLeftHanded, #aiProcess_FlipUVs and
-*   #aiProcess_FlipWindingOrder).
-* @return a status code indicating the result of the export
-* @note Use aiCopyScene() to get a modifiable copy of a previously
-*   imported scene.
-*/
-ASSIMP_API aiReturn aiExportScene( const C_STRUCT aiScene* pScene,
-    const char* pFormatId,
-    const char* pFileName,
-    unsigned int pPreprocessing);
-
-
-// --------------------------------------------------------------------------------
-/** Exports the given scene to a chosen file format using custom IO logic supplied by you.
-* @param pScene The scene to export. Stays in possession of the caller, is not changed by the function.
-* @param pFormatId ID string to specify to which format you want to export to. Use
-* aiGetExportFormatCount() / aiGetExportFormatDescription() to learn which export formats are available.
-* @param pFileName Output file to write
-* @param pIO custom IO implementation to be used. Use this if you use your own storage methods.
-*   If none is supplied, a default implementation using standard file IO is used. Note that
-*   #aiExportSceneToBlob is provided as convenience function to export to memory buffers.
-* @param pPreprocessing Please see the documentation for #aiExportScene
-* @return a status code indicating the result of the export
-* @note Include <aiFileIO.h> for the definition of #aiFileIO.
-* @note Use aiCopyScene() to get a modifiable copy of a previously
-*   imported scene.
-*/
-ASSIMP_API aiReturn aiExportSceneEx( const C_STRUCT aiScene* pScene,
-    const char* pFormatId,
-    const char* pFileName,
-    C_STRUCT aiFileIO* pIO,
-    unsigned int pPreprocessing );
-
-// --------------------------------------------------------------------------------
-/** Describes a blob of exported scene data. Use #aiExportSceneToBlob() to create a blob containing an
-* exported scene. The memory referred by this structure is owned by Assimp.
-* to free its resources. Don't try to free the memory on your side - it will crash for most build configurations
-* due to conflicting heaps.
-*
-* Blobs can be nested - each blob may reference another blob, which may in turn reference another blob and so on.
-* This is used when exporters write more than one output file for a given #aiScene. See the remarks for
-* #aiExportDataBlob::name for more information.
-*/
-struct aiExportDataBlob
-{
-    /// Size of the data in bytes
-    size_t size;
-
-    /// The data.
-    void* data;
-
-    /** Name of the blob. An empty string always
-        indicates the first (and primary) blob,
-        which contains the actual file data.
-        Any other blobs are auxiliary files produced
-        by exporters (i.e. material files). Existence
-        of such files depends on the file format. Most
-        formats don't split assets across multiple files.
-
-        If used, blob names usually contain the file
-        extension that should be used when writing
-        the data to disc.
-     */
-    C_STRUCT aiString name;
-
-    /** Pointer to the next blob in the chain or NULL if there is none. */
-    C_STRUCT aiExportDataBlob * next;
-
-#ifdef __cplusplus
-    /// Default constructor
-    aiExportDataBlob() { size = 0; data = next = NULL; }
-    /// Releases the data
-    ~aiExportDataBlob() { delete [] static_cast<unsigned char*>( data ); delete next; }
-
-private:
-    // no copying
-    aiExportDataBlob(const aiExportDataBlob& );
-    aiExportDataBlob& operator= (const aiExportDataBlob& );
-#endif // __cplusplus
-};
-
-// --------------------------------------------------------------------------------
-/** Exports the given scene to a chosen file format. Returns the exported data as a binary blob which
-* you can write into a file or something. When you're done with the data, use #aiReleaseExportBlob()
-* to free the resources associated with the export.
-* @param pScene The scene to export. Stays in possession of the caller, is not changed by the function.
-* @param pFormatId ID string to specify to which format you want to export to. Use
-* #aiGetExportFormatCount() / #aiGetExportFormatDescription() to learn which export formats are available.
-* @param pPreprocessing Please see the documentation for #aiExportScene
-* @return the exported data or NULL in case of error
-*/
-ASSIMP_API const C_STRUCT aiExportDataBlob* aiExportSceneToBlob( const C_STRUCT aiScene* pScene, const char* pFormatId,
-    unsigned int pPreprocessing );
-
-// --------------------------------------------------------------------------------
-/** Releases the memory associated with the given exported data. Use this function to free a data blob
-* returned by aiExportScene().
-* @param pData the data blob returned by #aiExportSceneToBlob
-*/
-ASSIMP_API void aiReleaseExportBlob( const C_STRUCT aiExportDataBlob* pData );
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // ASSIMP_BUILD_NO_EXPORT
-#endif // AI_EXPORT_H_INC
diff --git a/thirdparty/assimp/include/assimp/cfileio.h b/thirdparty/assimp/include/assimp/cfileio.h
deleted file mode 100644
index be90999d87..0000000000
--- a/thirdparty/assimp/include/assimp/cfileio.h
+++ /dev/null
@@ -1,144 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file cfileio.h
- *  @brief Defines generic C routines to access memory-mapped files
- */
-#pragma once
-#ifndef AI_FILEIO_H_INC
-#define AI_FILEIO_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct aiFileIO;
-struct aiFile;
-
-// aiFile callbacks
-typedef size_t          (*aiFileWriteProc) (C_STRUCT aiFile*,   const char*, size_t, size_t);
-typedef size_t          (*aiFileReadProc)  (C_STRUCT aiFile*,   char*, size_t,size_t);
-typedef size_t          (*aiFileTellProc)  (C_STRUCT aiFile*);
-typedef void            (*aiFileFlushProc) (C_STRUCT aiFile*);
-typedef C_ENUM aiReturn (*aiFileSeek)      (C_STRUCT aiFile*, size_t, C_ENUM aiOrigin);
-
-// aiFileIO callbacks
-typedef C_STRUCT aiFile* (*aiFileOpenProc)  (C_STRUCT aiFileIO*, const char*, const char*);
-typedef void             (*aiFileCloseProc) (C_STRUCT aiFileIO*, C_STRUCT aiFile*);
-
-// Represents user-defined data
-typedef char* aiUserData;
-
-// ----------------------------------------------------------------------------------
-/** @brief C-API: File system callbacks
- *
- *  Provided are functions to open and close files. Supply a custom structure to
- *  the import function. If you don't, a default implementation is used. Use custom
- *  file systems to enable reading from other sources, such as ZIPs
- *  or memory locations. */
-struct aiFileIO
-{
-    /** Function used to open a new file
-     */
-    aiFileOpenProc OpenProc;
-
-    /** Function used to close an existing file
-     */
-    aiFileCloseProc CloseProc;
-
-    /** User-defined, opaque data */
-    aiUserData UserData;
-};
-
-// ----------------------------------------------------------------------------------
-/** @brief C-API: File callbacks
- *
- *  Actually, it's a data structure to wrap a set of fXXXX (e.g fopen)
- *  replacement functions.
- *
- *  The default implementation of the functions utilizes the fXXX functions from
- *  the CRT. However, you can supply a custom implementation to Assimp by
- *  delivering a custom aiFileIO. Use this to enable reading from other sources,
- *  such as ZIP archives or memory locations. */
-struct aiFile
-{
-    /** Callback to read from a file */
-    aiFileReadProc ReadProc;
-
-    /** Callback to write to a file */
-    aiFileWriteProc WriteProc;
-
-    /** Callback to retrieve the current position of
-     *  the file cursor (ftell())
-     */
-    aiFileTellProc TellProc;
-
-    /** Callback to retrieve the size of the file,
-     *  in bytes
-     */
-    aiFileTellProc FileSizeProc;
-
-    /** Callback to set the current position
-     * of the file cursor (fseek())
-     */
-    aiFileSeek SeekProc;
-
-    /** Callback to flush the file contents
-     */
-    aiFileFlushProc FlushProc;
-
-    /** User-defined, opaque data
-     */
-    aiUserData UserData;
-};
-
-#ifdef __cplusplus
-}
-#endif
-#endif // AI_FILEIO_H_INC
diff --git a/thirdparty/assimp/include/assimp/cimport.h b/thirdparty/assimp/include/assimp/cimport.h
deleted file mode 100644
index 66b1c9a174..0000000000
--- a/thirdparty/assimp/include/assimp/cimport.h
+++ /dev/null
@@ -1,569 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  cimport.h
- *  @brief Defines the C-API to the Open Asset Import Library.
- */
-#pragma once
-#ifndef AI_ASSIMP_H_INC
-#define AI_ASSIMP_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-#include <assimp/importerdesc.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-struct aiScene;  // aiScene.h
-struct aiFileIO; // aiFileIO.h
-typedef void (*aiLogStreamCallback)(const char* /* message */, char* /* user */);
-
-// --------------------------------------------------------------------------------
-/** C-API: Represents a log stream. A log stream receives all log messages and
- *  streams them _somewhere_.
- *  @see aiGetPredefinedLogStream
- *  @see aiAttachLogStream
- *  @see aiDetachLogStream */
-// --------------------------------------------------------------------------------
-struct aiLogStream
-{
-    /** callback to be called */
-    aiLogStreamCallback callback;
-
-    /** user data to be passed to the callback */
-    char* user;
-};
-
-
-// --------------------------------------------------------------------------------
-/** C-API: Represents an opaque set of settings to be used during importing.
- *  @see aiCreatePropertyStore
- *  @see aiReleasePropertyStore
- *  @see aiImportFileExWithProperties
- *  @see aiSetPropertyInteger
- *  @see aiSetPropertyFloat
- *  @see aiSetPropertyString
- *  @see aiSetPropertyMatrix
- */
-// --------------------------------------------------------------------------------
-struct aiPropertyStore { char sentinel; };
-
-/** Our own C boolean type */
-typedef int aiBool;
-
-#define AI_FALSE 0
-#define AI_TRUE 1
-
-// --------------------------------------------------------------------------------
-/** Reads the given file and returns its content.
- *
- * If the call succeeds, the imported data is returned in an aiScene structure.
- * The data is intended to be read-only, it stays property of the ASSIMP
- * library and will be stable until aiReleaseImport() is called. After you're
- * done with it, call aiReleaseImport() to free the resources associated with
- * this file. If the import fails, NULL is returned instead. Call
- * aiGetErrorString() to retrieve a human-readable error text.
- * @param pFile Path and filename of the file to be imported,
- *   expected to be a null-terminated c-string. NULL is not a valid value.
- * @param pFlags Optional post processing steps to be executed after
- *   a successful import. Provide a bitwise combination of the
- *   #aiPostProcessSteps flags.
- * @return Pointer to the imported data or NULL if the import failed.
- */
-ASSIMP_API const C_STRUCT aiScene* aiImportFile(
-    const char* pFile,
-    unsigned int pFlags);
-
-// --------------------------------------------------------------------------------
-/** Reads the given file using user-defined I/O functions and returns
- *   its content.
- *
- * If the call succeeds, the imported data is returned in an aiScene structure.
- * The data is intended to be read-only, it stays property of the ASSIMP
- * library and will be stable until aiReleaseImport() is called. After you're
- * done with it, call aiReleaseImport() to free the resources associated with
- * this file. If the import fails, NULL is returned instead. Call
- * aiGetErrorString() to retrieve a human-readable error text.
- * @param pFile Path and filename of the file to be imported,
- *   expected to be a null-terminated c-string. NULL is not a valid value.
- * @param pFlags Optional post processing steps to be executed after
- *   a successful import. Provide a bitwise combination of the
- *   #aiPostProcessSteps flags.
- * @param pFS aiFileIO structure. Will be used to open the model file itself
- *   and any other files the loader needs to open.  Pass NULL to use the default
- *   implementation.
- * @return Pointer to the imported data or NULL if the import failed.
- * @note Include <aiFileIO.h> for the definition of #aiFileIO.
- */
-ASSIMP_API const C_STRUCT aiScene* aiImportFileEx(
-    const char* pFile,
-    unsigned int pFlags,
-    C_STRUCT aiFileIO* pFS);
-
-// --------------------------------------------------------------------------------
-/** Same as #aiImportFileEx, but adds an extra parameter containing importer settings.
- *
- * @param pFile Path and filename of the file to be imported,
- *   expected to be a null-terminated c-string. NULL is not a valid value.
- * @param pFlags Optional post processing steps to be executed after
- *   a successful import. Provide a bitwise combination of the
- *   #aiPostProcessSteps flags.
- * @param pFS aiFileIO structure. Will be used to open the model file itself
- *   and any other files the loader needs to open.  Pass NULL to use the default
- *   implementation.
- * @param pProps #aiPropertyStore instance containing import settings.
- * @return Pointer to the imported data or NULL if the import failed.
- * @note Include <aiFileIO.h> for the definition of #aiFileIO.
- * @see aiImportFileEx
- */
-ASSIMP_API const C_STRUCT aiScene* aiImportFileExWithProperties(
-    const char* pFile,
-    unsigned int pFlags,
-    C_STRUCT aiFileIO* pFS,
-    const C_STRUCT aiPropertyStore* pProps);
-
-// --------------------------------------------------------------------------------
-/** Reads the given file from a given memory buffer,
- *
- * If the call succeeds, the contents of the file are returned as a pointer to an
- * aiScene object. The returned data is intended to be read-only, the importer keeps
- * ownership of the data and will destroy it upon destruction. If the import fails,
- * NULL is returned.
- * A human-readable error description can be retrieved by calling aiGetErrorString().
- * @param pBuffer Pointer to the file data
- * @param pLength Length of pBuffer, in bytes
- * @param pFlags Optional post processing steps to be executed after
- *   a successful import. Provide a bitwise combination of the
- *   #aiPostProcessSteps flags. If you wish to inspect the imported
- *   scene first in order to fine-tune your post-processing setup,
- *   consider to use #aiApplyPostProcessing().
- * @param pHint An additional hint to the library. If this is a non empty string,
- *   the library looks for a loader to support the file extension specified by pHint
- *   and passes the file to the first matching loader. If this loader is unable to
- *   completely the request, the library continues and tries to determine the file
- *   format on its own, a task that may or may not be successful.
- *   Check the return value, and you'll know ...
- * @return A pointer to the imported data, NULL if the import failed.
- *
- * @note This is a straightforward way to decode models from memory
- * buffers, but it doesn't handle model formats that spread their
- * data across multiple files or even directories. Examples include
- * OBJ or MD3, which outsource parts of their material info into
- * external scripts. If you need full functionality, provide
- * a custom IOSystem to make Assimp find these files and use
- * the regular aiImportFileEx()/aiImportFileExWithProperties() API.
- */
-ASSIMP_API const C_STRUCT aiScene* aiImportFileFromMemory(
-    const char* pBuffer,
-    unsigned int pLength,
-    unsigned int pFlags,
-    const char* pHint);
-
-// --------------------------------------------------------------------------------
-/** Same as #aiImportFileFromMemory, but adds an extra parameter containing importer settings.
- *
- * @param pBuffer Pointer to the file data
- * @param pLength Length of pBuffer, in bytes
- * @param pFlags Optional post processing steps to be executed after
- *   a successful import. Provide a bitwise combination of the
- *   #aiPostProcessSteps flags. If you wish to inspect the imported
- *   scene first in order to fine-tune your post-processing setup,
- *   consider to use #aiApplyPostProcessing().
- * @param pHint An additional hint to the library. If this is a non empty string,
- *   the library looks for a loader to support the file extension specified by pHint
- *   and passes the file to the first matching loader. If this loader is unable to
- *   completely the request, the library continues and tries to determine the file
- *   format on its own, a task that may or may not be successful.
- *   Check the return value, and you'll know ...
- * @param pProps #aiPropertyStore instance containing import settings.
- * @return A pointer to the imported data, NULL if the import failed.
- *
- * @note This is a straightforward way to decode models from memory
- * buffers, but it doesn't handle model formats that spread their
- * data across multiple files or even directories. Examples include
- * OBJ or MD3, which outsource parts of their material info into
- * external scripts. If you need full functionality, provide
- * a custom IOSystem to make Assimp find these files and use
- * the regular aiImportFileEx()/aiImportFileExWithProperties() API.
- * @see aiImportFileFromMemory
- */
-ASSIMP_API const C_STRUCT aiScene* aiImportFileFromMemoryWithProperties(
-    const char* pBuffer,
-    unsigned int pLength,
-    unsigned int pFlags,
-    const char* pHint,
-    const C_STRUCT aiPropertyStore* pProps);
-
-// --------------------------------------------------------------------------------
-/** Apply post-processing to an already-imported scene.
- *
- * This is strictly equivalent to calling #aiImportFile()/#aiImportFileEx with the
- * same flags. However, you can use this separate function to inspect the imported
- * scene first to fine-tune your post-processing setup.
- * @param pScene Scene to work on.
- * @param pFlags Provide a bitwise combination of the #aiPostProcessSteps flags.
- * @return A pointer to the post-processed data. Post processing is done in-place,
- *   meaning this is still the same #aiScene which you passed for pScene. However,
- *   _if_ post-processing failed, the scene could now be NULL. That's quite a rare
- *   case, post processing steps are not really designed to 'fail'. To be exact,
- *   the #aiProcess_ValidateDataStructure flag is currently the only post processing step
- *   which can actually cause the scene to be reset to NULL.
- */
-ASSIMP_API const C_STRUCT aiScene* aiApplyPostProcessing(
-    const C_STRUCT aiScene* pScene,
-    unsigned int pFlags);
-
-// --------------------------------------------------------------------------------
-/** Get one of the predefine log streams. This is the quick'n'easy solution to
- *  access Assimp's log system. Attaching a log stream can slightly reduce Assimp's
- *  overall import performance.
- *
- *  Usage is rather simple (this will stream the log to a file, named log.txt, and
- *  the stdout stream of the process:
- *  @code
- *    struct aiLogStream c;
- *    c = aiGetPredefinedLogStream(aiDefaultLogStream_FILE,"log.txt");
- *    aiAttachLogStream(&c);
- *    c = aiGetPredefinedLogStream(aiDefaultLogStream_STDOUT,NULL);
- *    aiAttachLogStream(&c);
- *  @endcode
- *
- *  @param pStreams One of the #aiDefaultLogStream enumerated values.
- *  @param file Solely for the #aiDefaultLogStream_FILE flag: specifies the file to write to.
- *    Pass NULL for all other flags.
- *  @return The log stream. callback is set to NULL if something went wrong.
- */
-ASSIMP_API C_STRUCT aiLogStream aiGetPredefinedLogStream(
-    C_ENUM aiDefaultLogStream pStreams,
-    const char* file);
-
-// --------------------------------------------------------------------------------
-/** Attach a custom log stream to the libraries' logging system.
- *
- *  Attaching a log stream can slightly reduce Assimp's overall import
- *  performance. Multiple log-streams can be attached.
- *  @param stream Describes the new log stream.
- *  @note To ensure proper destruction of the logging system, you need to manually
- *    call aiDetachLogStream() on every single log stream you attach.
- *    Alternatively (for the lazy folks) #aiDetachAllLogStreams is provided.
- */
-ASSIMP_API void aiAttachLogStream(
-    const C_STRUCT aiLogStream* stream);
-
-// --------------------------------------------------------------------------------
-/** Enable verbose logging. Verbose logging includes debug-related stuff and
- *  detailed import statistics. This can have severe impact on import performance
- *  and memory consumption. However, it might be useful to find out why a file
- *  didn't read correctly.
- *  @param d AI_TRUE or AI_FALSE, your decision.
- */
-ASSIMP_API void aiEnableVerboseLogging(aiBool d);
-
-// --------------------------------------------------------------------------------
-/** Detach a custom log stream from the libraries' logging system.
- *
- *  This is the counterpart of #aiAttachLogStream. If you attached a stream,
- *  don't forget to detach it again.
- *  @param stream The log stream to be detached.
- *  @return AI_SUCCESS if the log stream has been detached successfully.
- *  @see aiDetachAllLogStreams
- */
-ASSIMP_API C_ENUM aiReturn aiDetachLogStream(
-    const C_STRUCT aiLogStream* stream);
-
-// --------------------------------------------------------------------------------
-/** Detach all active log streams from the libraries' logging system.
- *  This ensures that the logging system is terminated properly and all
- *  resources allocated by it are actually freed. If you attached a stream,
- *  don't forget to detach it again.
- *  @see aiAttachLogStream
- *  @see aiDetachLogStream
- */
-ASSIMP_API void aiDetachAllLogStreams(void);
-
-// --------------------------------------------------------------------------------
-/** Releases all resources associated with the given import process.
- *
- * Call this function after you're done with the imported data.
- * @param pScene The imported data to release. NULL is a valid value.
- */
-ASSIMP_API void aiReleaseImport(
-    const C_STRUCT aiScene* pScene);
-
-// --------------------------------------------------------------------------------
-/** Returns the error text of the last failed import process.
- *
- * @return A textual description of the error that occurred at the last
- * import process. NULL if there was no error. There can't be an error if you
- * got a non-NULL #aiScene from #aiImportFile/#aiImportFileEx/#aiApplyPostProcessing.
- */
-ASSIMP_API const char* aiGetErrorString(void);
-
-// --------------------------------------------------------------------------------
-/** Returns whether a given file extension is supported by ASSIMP
- *
- * @param szExtension Extension for which the function queries support for.
- * Must include a leading dot '.'. Example: ".3ds", ".md3"
- * @return AI_TRUE if the file extension is supported.
- */
-ASSIMP_API aiBool aiIsExtensionSupported(
-    const char* szExtension);
-
-// --------------------------------------------------------------------------------
-/** Get a list of all file extensions supported by ASSIMP.
- *
- * If a file extension is contained in the list this does, of course, not
- * mean that ASSIMP is able to load all files with this extension.
- * @param szOut String to receive the extension list.
- * Format of the list: "*.3ds;*.obj;*.dae". NULL is not a valid parameter.
- */
-ASSIMP_API void aiGetExtensionList(
-    C_STRUCT aiString* szOut);
-
-// --------------------------------------------------------------------------------
-/** Get the approximated storage required by an imported asset
- * @param pIn Input asset.
- * @param in Data structure to be filled.
- */
-ASSIMP_API void aiGetMemoryRequirements(
-    const C_STRUCT aiScene* pIn,
-    C_STRUCT aiMemoryInfo* in);
-
-
-
-// --------------------------------------------------------------------------------
-/** Create an empty property store. Property stores are used to collect import
- *  settings.
- * @return New property store. Property stores need to be manually destroyed using
- *   the #aiReleasePropertyStore API function.
- */
-ASSIMP_API C_STRUCT aiPropertyStore* aiCreatePropertyStore(void);
-
-// --------------------------------------------------------------------------------
-/** Delete a property store.
- * @param p Property store to be deleted.
- */
-ASSIMP_API void aiReleasePropertyStore(C_STRUCT aiPropertyStore* p);
-
-// --------------------------------------------------------------------------------
-/** Set an integer property.
- *
- *  This is the C-version of #Assimp::Importer::SetPropertyInteger(). In the C
- *  interface, properties are always shared by all imports. It is not possible to
- *  specify them per import.
- *
- * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
- * @param szName Name of the configuration property to be set. All supported
- *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
- * @param value New value for the property
- */
-ASSIMP_API void aiSetImportPropertyInteger(
-    C_STRUCT aiPropertyStore* store,
-    const char* szName,
-    int value);
-
-// --------------------------------------------------------------------------------
-/** Set a floating-point property.
- *
- *  This is the C-version of #Assimp::Importer::SetPropertyFloat(). In the C
- *  interface, properties are always shared by all imports. It is not possible to
- *  specify them per import.
- *
- * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
- * @param szName Name of the configuration property to be set. All supported
- *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
- * @param value New value for the property
- */
-ASSIMP_API void aiSetImportPropertyFloat(
-    C_STRUCT aiPropertyStore* store,
-    const char* szName,
-    ai_real value);
-
-// --------------------------------------------------------------------------------
-/** Set a string property.
- *
- *  This is the C-version of #Assimp::Importer::SetPropertyString(). In the C
- *  interface, properties are always shared by all imports. It is not possible to
- *  specify them per import.
- *
- * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
- * @param szName Name of the configuration property to be set. All supported
- *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
- * @param st New value for the property
- */
-ASSIMP_API void aiSetImportPropertyString(
-    C_STRUCT aiPropertyStore* store,
-    const char* szName,
-    const C_STRUCT aiString* st);
-
-// --------------------------------------------------------------------------------
-/** Set a matrix property.
- *
- *  This is the C-version of #Assimp::Importer::SetPropertyMatrix(). In the C
- *  interface, properties are always shared by all imports. It is not possible to
- *  specify them per import.
- *
- * @param store Store to modify. Use #aiCreatePropertyStore to obtain a store.
- * @param szName Name of the configuration property to be set. All supported
- *   public properties are defined in the config.h header file (AI_CONFIG_XXX).
- * @param mat New value for the property
- */
-ASSIMP_API void aiSetImportPropertyMatrix(
-    C_STRUCT aiPropertyStore* store,
-    const char* szName,
-    const C_STRUCT aiMatrix4x4* mat);
-
-// --------------------------------------------------------------------------------
-/** Construct a quaternion from a 3x3 rotation matrix.
- *  @param quat Receives the output quaternion.
- *  @param mat Matrix to 'quaternionize'.
- *  @see aiQuaternion(const aiMatrix3x3& pRotMatrix)
- */
-ASSIMP_API void aiCreateQuaternionFromMatrix(
-    C_STRUCT aiQuaternion* quat,
-    const C_STRUCT aiMatrix3x3* mat);
-
-// --------------------------------------------------------------------------------
-/** Decompose a transformation matrix into its rotational, translational and
- *  scaling components.
- *
- * @param mat Matrix to decompose
- * @param scaling Receives the scaling component
- * @param rotation Receives the rotational component
- * @param position Receives the translational component.
- * @see aiMatrix4x4::Decompose (aiVector3D&, aiQuaternion&, aiVector3D&) const;
- */
-ASSIMP_API void aiDecomposeMatrix(
-    const C_STRUCT aiMatrix4x4* mat,
-    C_STRUCT aiVector3D* scaling,
-    C_STRUCT aiQuaternion* rotation,
-    C_STRUCT aiVector3D* position);
-
-// --------------------------------------------------------------------------------
-/** Transpose a 4x4 matrix.
- *  @param mat Pointer to the matrix to be transposed
- */
-ASSIMP_API void aiTransposeMatrix4(
-    C_STRUCT aiMatrix4x4* mat);
-
-// --------------------------------------------------------------------------------
-/** Transpose a 3x3 matrix.
- *  @param mat Pointer to the matrix to be transposed
- */
-ASSIMP_API void aiTransposeMatrix3(
-    C_STRUCT aiMatrix3x3* mat);
-
-// --------------------------------------------------------------------------------
-/** Transform a vector by a 3x3 matrix
- *  @param vec Vector to be transformed.
- *  @param mat Matrix to transform the vector with.
- */
-ASSIMP_API void aiTransformVecByMatrix3(
-    C_STRUCT aiVector3D* vec,
-    const C_STRUCT aiMatrix3x3* mat);
-
-// --------------------------------------------------------------------------------
-/** Transform a vector by a 4x4 matrix
- *  @param vec Vector to be transformed.
- *  @param mat Matrix to transform the vector with.
- */
-ASSIMP_API void aiTransformVecByMatrix4(
-    C_STRUCT aiVector3D* vec,
-    const C_STRUCT aiMatrix4x4* mat);
-
-// --------------------------------------------------------------------------------
-/** Multiply two 4x4 matrices.
- *  @param dst First factor, receives result.
- *  @param src Matrix to be multiplied with 'dst'.
- */
-ASSIMP_API void aiMultiplyMatrix4(
-    C_STRUCT aiMatrix4x4* dst,
-    const C_STRUCT aiMatrix4x4* src);
-
-// --------------------------------------------------------------------------------
-/** Multiply two 3x3 matrices.
- *  @param dst First factor, receives result.
- *  @param src Matrix to be multiplied with 'dst'.
- */
-ASSIMP_API void aiMultiplyMatrix3(
-    C_STRUCT aiMatrix3x3* dst,
-    const C_STRUCT aiMatrix3x3* src);
-
-// --------------------------------------------------------------------------------
-/** Get a 3x3 identity matrix.
- *  @param mat Matrix to receive its personal identity
- */
-ASSIMP_API void aiIdentityMatrix3(
-    C_STRUCT aiMatrix3x3* mat);
-
-// --------------------------------------------------------------------------------
-/** Get a 4x4 identity matrix.
- *  @param mat Matrix to receive its personal identity
- */
-ASSIMP_API void aiIdentityMatrix4(
-    C_STRUCT aiMatrix4x4* mat);
-
-// --------------------------------------------------------------------------------
-/** Returns the number of import file formats available in the current Assimp build.
- * Use aiGetImportFormatDescription() to retrieve infos of a specific import format.
- */
-ASSIMP_API size_t aiGetImportFormatCount(void);
-
-// --------------------------------------------------------------------------------
-/** Returns a description of the nth import file format. Use #aiGetImportFormatCount()
- * to learn how many import formats are supported.
- * @param pIndex Index of the import format to retrieve information for. Valid range is
- *    0 to #aiGetImportFormatCount()
- * @return A description of that specific import format. NULL if pIndex is out of range.
- */
-ASSIMP_API const C_STRUCT aiImporterDesc* aiGetImportFormatDescription( size_t pIndex);
-#ifdef __cplusplus
-}
-#endif
-
-#endif // AI_ASSIMP_H_INC
diff --git a/thirdparty/assimp/include/assimp/color4.h b/thirdparty/assimp/include/assimp/color4.h
deleted file mode 100644
index fa86128f4f..0000000000
--- a/thirdparty/assimp/include/assimp/color4.h
+++ /dev/null
@@ -1,103 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-/** @file color4.h
- *  @brief RGBA color structure, including operators when compiling in C++
- */
-#pragma once
-#ifndef AI_COLOR4D_H_INC
-#define AI_COLOR4D_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/defs.h>
-
-#ifdef __cplusplus
-
-// ----------------------------------------------------------------------------------
-/** Represents a color in Red-Green-Blue space including an
-*   alpha component. Color values range from 0 to 1. */
-// ----------------------------------------------------------------------------------
-template <typename TReal>
-class aiColor4t {
-public:
-    aiColor4t() AI_NO_EXCEPT : r(), g(), b(), a() {}
-    aiColor4t (TReal _r, TReal _g, TReal _b, TReal _a)
-        : r(_r), g(_g), b(_b), a(_a) {}
-    explicit aiColor4t (TReal _r) : r(_r), g(_r), b(_r), a(_r) {}
-    aiColor4t (const aiColor4t& o) = default;
-
-    // combined operators
-    const aiColor4t& operator += (const aiColor4t& o);
-    const aiColor4t& operator -= (const aiColor4t& o);
-    const aiColor4t& operator *= (TReal f);
-    const aiColor4t& operator /= (TReal f);
-
-    // comparison
-    bool operator == (const aiColor4t& other) const;
-    bool operator != (const aiColor4t& other) const;
-    bool operator <  (const aiColor4t& other) const;
-
-    // color tuple access, rgba order
-    inline TReal operator[](unsigned int i) const;
-    inline TReal& operator[](unsigned int i);
-
-    /** check whether a color is (close to) black */
-    inline bool IsBlack() const;
-
-    // Red, green, blue and alpha color values
-    TReal r, g, b, a;
-};  // !struct aiColor4D
-
-typedef aiColor4t<ai_real> aiColor4D;
-
-#else
-
-struct aiColor4D {
-    ai_real r, g, b, a;
-};
-
-#endif // __cplusplus
-
-#endif // AI_COLOR4D_H_INC
diff --git a/thirdparty/assimp/include/assimp/color4.inl b/thirdparty/assimp/include/assimp/color4.inl
deleted file mode 100644
index d4a2a98109..0000000000
--- a/thirdparty/assimp/include/assimp/color4.inl
+++ /dev/null
@@ -1,251 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  color4.inl
- *  @brief Inline implementation of aiColor4t<TReal> operators
- */
-#pragma once
-#ifndef AI_COLOR4D_INL_INC
-#define AI_COLOR4D_INL_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef __cplusplus
-#include <assimp/color4.h>
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiColor4t<TReal>& aiColor4t<TReal>::operator += (const aiColor4t<TReal>& o) {
-    r += o.r;
-    g += o.g;
-    b += o.b;
-    a += o.a;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiColor4t<TReal>& aiColor4t<TReal>::operator -= (const aiColor4t<TReal>& o) {
-    r -= o.r;
-    g -= o.g;
-    b -= o.b;
-    a -= o.a;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiColor4t<TReal>& aiColor4t<TReal>::operator *= (TReal f) {
-    r *= f;
-    g *= f;
-    b *= f;
-    a *= f;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiColor4t<TReal>& aiColor4t<TReal>::operator /= (TReal f) {
-    r /= f;
-    g /= f;
-    b /= f;
-    a /= f;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal aiColor4t<TReal>::operator[](unsigned int i) const {
-    switch ( i ) {
-        case 0:
-            return r;
-        case 1:
-            return g;
-        case 2:
-            return b;
-        case 3:
-            return a;
-        default:
-            break;
-    }
-    return r;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal& aiColor4t<TReal>::operator[](unsigned int i) {
-    switch ( i ) {
-        case 0:
-            return r;
-        case 1:
-            return g;
-        case 2:
-            return b;
-        case 3:
-            return a;
-        default:
-            break;
-    }
-    return r;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiColor4t<TReal>::operator== (const aiColor4t<TReal>& other) const {
-    return r == other.r && g == other.g && b == other.b && a == other.a;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiColor4t<TReal>::operator!= (const aiColor4t<TReal>& other) const {
-    return r != other.r || g != other.g || b != other.b || a != other.a;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiColor4t<TReal>::operator< (const aiColor4t<TReal>& other) const {
-    return r < other.r || (
-        r == other.r && (
-            g < other.g || (
-                g == other.g && (
-                    b < other.b || (
-                        b == other.b && (
-                            a < other.a
-                        )
-                    )
-                )
-            )
-        )
-    );
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator + (const aiColor4t<TReal>& v1, const aiColor4t<TReal>& v2)    {
-    return aiColor4t<TReal>( v1.r + v2.r, v1.g + v2.g, v1.b + v2.b, v1.a + v2.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator - (const aiColor4t<TReal>& v1, const aiColor4t<TReal>& v2)    {
-    return aiColor4t<TReal>( v1.r - v2.r, v1.g - v2.g, v1.b - v2.b, v1.a - v2.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE aiColor4t<TReal> operator * (const aiColor4t<TReal>& v1, const aiColor4t<TReal>& v2)    {
-    return aiColor4t<TReal>( v1.r * v2.r, v1.g * v2.g, v1.b * v2.b, v1.a * v2.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator / (const aiColor4t<TReal>& v1, const aiColor4t<TReal>& v2)    {
-    return aiColor4t<TReal>( v1.r / v2.r, v1.g / v2.g, v1.b / v2.b, v1.a / v2.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator * ( TReal f, const aiColor4t<TReal>& v)   {
-    return aiColor4t<TReal>( f*v.r, f*v.g, f*v.b, f*v.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator * ( const aiColor4t<TReal>& v, TReal f)  {
-    return aiColor4t<TReal>( f*v.r, f*v.g, f*v.b, f*v.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator / ( const aiColor4t<TReal>& v, TReal f)  {
-    return v * (1/f);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator / ( TReal f,const aiColor4t<TReal>& v)   {
-    return aiColor4t<TReal>(f,f,f,f)/v;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator + ( const aiColor4t<TReal>& v, TReal f)  {
-    return aiColor4t<TReal>( f+v.r, f+v.g, f+v.b, f+v.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator - ( const aiColor4t<TReal>& v, TReal f)  {
-    return aiColor4t<TReal>( v.r-f, v.g-f, v.b-f, v.a-f);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator + ( TReal f, const aiColor4t<TReal>& v)  {
-    return aiColor4t<TReal>( f+v.r, f+v.g, f+v.b, f+v.a);
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiColor4t<TReal> operator - ( TReal f, const aiColor4t<TReal>& v)  {
-    return aiColor4t<TReal>( f-v.r, f-v.g, f-v.b, f-v.a);
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiColor4t<TReal>::IsBlack() const {
-    // The alpha component doesn't care here. black is black.
-    static const TReal epsilon = 10e-3f;
-    return std::fabs( r ) < epsilon && std::fabs( g ) < epsilon && std::fabs( b ) < epsilon;
-}
-
-#endif // __cplusplus
-#endif // AI_VECTOR3D_INL_INC
diff --git a/thirdparty/assimp/include/assimp/config.h b/thirdparty/assimp/include/assimp/config.h
deleted file mode 100644
index 48d61941ad..0000000000
--- a/thirdparty/assimp/include/assimp/config.h
+++ /dev/null
@@ -1,1018 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2018, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file config.h
- *  @brief Defines constants for configurable properties for the library
- *
- *  Typically these properties are set via
- *  #Assimp::Importer::SetPropertyFloat,
- *  #Assimp::Importer::SetPropertyInteger or
- *  #Assimp::Importer::SetPropertyString,
- *  depending on the data type of a property. All properties have a
- *  default value. See the doc for the mentioned methods for more details.
- *
- *  <br><br>
- *  The corresponding functions for use with the plain-c API are:
- *  #aiSetImportPropertyInteger,
- *  #aiSetImportPropertyFloat,
- *  #aiSetImportPropertyString
- */
-#pragma once
-#ifndef AI_CONFIG_H_INC
-#define AI_CONFIG_H_INC
-
-
-// ###########################################################################
-// LIBRARY SETTINGS
-// General, global settings
-// ###########################################################################
-
-// ---------------------------------------------------------------------------
-/** @brief Enables time measurements.
- *
- *  If enabled, measures the time needed for each part of the loading
- *  process (i.e. IO time, importing, postprocessing, ..) and dumps
- *  these timings to the DefaultLogger. See the @link perf Performance
- *  Page@endlink for more information on this topic.
- *
- * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_GLOB_MEASURE_TIME  \
-    "GLOB_MEASURE_TIME"
-
-
-// ---------------------------------------------------------------------------
-/** @brief Global setting to disable generation of skeleton dummy meshes
- *
- * Skeleton dummy meshes are generated as a visualization aid in cases which
- * the input data contains no geometry, but only animation data.
- * Property data type: bool. Default value: false
- */
-// ---------------------------------------------------------------------------
-#define AI_CONFIG_IMPORT_NO_SKELETON_MESHES \
-    "IMPORT_NO_SKELETON_MESHES"
-
-
-
-# if 0 // not implemented yet
-// ---------------------------------------------------------------------------
-/** @brief Set Assimp's multithreading policy.
- *
- * This setting is ignored if Assimp was built without boost.thread
- * support (ASSIMP_BUILD_NO_THREADING, which is implied by ASSIMP_BUILD_BOOST_WORKAROUND).
- * Possible values are: -1 to let Assimp decide what to do, 0 to disable
- * multithreading entirely and any number larger than 0 to force a specific
- * number of threads. Assimp is always free to ignore this settings, which is
- * merely a hint. Usually, the default value (-1) will be fine. However, if
- * Assimp is used concurrently from multiple user threads, it might be useful
- * to limit each Importer instance to a specific number of cores.
- *
- * For more information, see the @link threading Threading page@endlink.
- * Property type: int, default value: -1.
- */
-#define AI_CONFIG_GLOB_MULTITHREADING  \
-    "GLOB_MULTITHREADING"
-#endif
-
-// ###########################################################################
-// POST PROCESSING SETTINGS
-// Various stuff to fine-tune the behavior of a specific post processing step.
-// ###########################################################################
-
-
-// ---------------------------------------------------------------------------
-/** @brief Maximum bone count per mesh for the SplitbyBoneCount step.
- *
- * Meshes are split until the maximum number of bones is reached. The default
- * value is AI_SBBC_DEFAULT_MAX_BONES, which may be altered at
- * compile-time.
- * Property data type: integer.
- */
-// ---------------------------------------------------------------------------
-#define AI_CONFIG_PP_SBBC_MAX_BONES \
-    "PP_SBBC_MAX_BONES"
-
-
-// default limit for bone count
-#if (!defined AI_SBBC_DEFAULT_MAX_BONES)
-#   define AI_SBBC_DEFAULT_MAX_BONES        60
-#endif
-
-
-// ---------------------------------------------------------------------------
-/** @brief  Specifies the maximum angle that may be between two vertex tangents
- *         that their tangents and bi-tangents are smoothed.
- *
- * This applies to the CalcTangentSpace-Step. The angle is specified
- * in degrees. The maximum value is 175.
- * Property type: float. Default value: 45 degrees
- */
-#define AI_CONFIG_PP_CT_MAX_SMOOTHING_ANGLE \
-    "PP_CT_MAX_SMOOTHING_ANGLE"
-
-// ---------------------------------------------------------------------------
-/** @brief Source UV channel for tangent space computation.
- *
- * The specified channel must exist or an error will be raised.
- * Property type: integer. Default value: 0
- */
-// ---------------------------------------------------------------------------
-#define AI_CONFIG_PP_CT_TEXTURE_CHANNEL_INDEX \
-    "PP_CT_TEXTURE_CHANNEL_INDEX"
-
-// ---------------------------------------------------------------------------
-/** @brief  Specifies the maximum angle that may be between two face normals
- *          at the same vertex position that their are smoothed together.
- *
- * Sometimes referred to as 'crease angle'.
- * This applies to the GenSmoothNormals-Step. The angle is specified
- * in degrees, so 180 is PI. The default value is 175 degrees (all vertex
- * normals are smoothed). The maximum value is 175, too. Property type: float.
- * Warning: setting this option may cause a severe loss of performance. The
- * performance is unaffected if the #AI_CONFIG_FAVOUR_SPEED flag is set but
- * the output quality may be reduced.
- */
-#define AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE \
-    "PP_GSN_MAX_SMOOTHING_ANGLE"
-
-
-// ---------------------------------------------------------------------------
-/** @brief Sets the colormap (= palette) to be used to decode embedded
- *         textures in MDL (Quake or 3DGS) files.
- *
- * This must be a valid path to a file. The file is 768 (256*3) bytes
- * large and contains RGB triplets for each of the 256 palette entries.
- * The default value is colormap.lmp. If the file is not found,
- * a default palette (from Quake 1) is used.
- * Property type: string.
- */
-#define AI_CONFIG_IMPORT_MDL_COLORMAP       \
-    "IMPORT_MDL_COLORMAP"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_RemoveRedundantMaterials step to
- *  keep materials matching a name in a given list.
- *
- * This is a list of 1 to n strings, ' ' serves as delimiter character.
- * Identifiers containing whitespaces must be enclosed in *single*
- * quotation marks. For example:<tt>
- * "keep-me and_me_to anotherMaterialToBeKept \'name with whitespace\'"</tt>.
- * If a material matches on of these names, it will not be modified or
- * removed by the postprocessing step nor will other materials be replaced
- * by a reference to it. <br>
- * This option might be useful if you are using some magic material names
- * to pass additional semantics through the content pipeline. This ensures
- * they won't be optimized away, but a general optimization is still
- * performed for materials not contained in the list.
- * Property type: String. Default value: n/a
- * @note Linefeeds, tabs or carriage returns are treated as whitespace.
- *   Material names are case sensitive.
- */
-#define AI_CONFIG_PP_RRM_EXCLUDE_LIST   \
-    "PP_RRM_EXCLUDE_LIST"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to
- *  keep the scene hierarchy. Meshes are moved to worldspace, but
- *  no optimization is performed (read: meshes with equal materials are not
- *  joined. The total number of meshes won't change).
- *
- * This option could be of use for you if the scene hierarchy contains
- * important additional information which you intend to parse.
- * For rendering, you can still render all meshes in the scene without
- * any transformations.
- * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_PP_PTV_KEEP_HIERARCHY     \
-    "PP_PTV_KEEP_HIERARCHY"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to normalize
- *  all vertex components into the [-1,1] range. That is, a bounding box
- *  for the whole scene is computed, the maximum component is taken and all
- *  meshes are scaled appropriately (uniformly of course!).
- *  This might be useful if you don't know the spatial dimension of the input
- *  data*/
-#define AI_CONFIG_PP_PTV_NORMALIZE  \
-    "PP_PTV_NORMALIZE"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to use
- *  a users defined matrix as the scene root node transformation before
- *  transforming vertices.
- *  Property type: bool. Default value: false.
- */
-#define AI_CONFIG_PP_PTV_ADD_ROOT_TRANSFORMATION    \
-    "PP_PTV_ADD_ROOT_TRANSFORMATION"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to use
- *  a users defined matrix as the scene root node transformation before
- *  transforming vertices. This property correspond to the 'a1' component
- *  of the transformation matrix.
- *  Property type: aiMatrix4x4.
- */
-#define AI_CONFIG_PP_PTV_ROOT_TRANSFORMATION    \
-    "PP_PTV_ROOT_TRANSFORMATION"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_FindDegenerates step to
- *  remove degenerated primitives from the import - immediately.
- *
- * The default behaviour converts degenerated triangles to lines and
- * degenerated lines to points. See the documentation to the
- * #aiProcess_FindDegenerates step for a detailed example of the various ways
- * to get rid of these lines and points if you don't want them.
- * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_PP_FD_REMOVE \
-    "PP_FD_REMOVE"
-
-// ---------------------------------------------------------------------------
-/**
- *  @brief  Configures the #aiProcess_FindDegenerates to check the area of a
- *  trinagle to be greates than e-6. If this is not the case the triangle will
- *  be removed if #AI_CONFIG_PP_FD_REMOVE is set to true.
- */
-#define AI_CONFIG_PP_FD_CHECKAREA \
-    "PP_FD_CHECKAREA"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_OptimizeGraph step to preserve nodes
- * matching a name in a given list.
- *
- * This is a list of 1 to n strings, ' ' serves as delimiter character.
- * Identifiers containing whitespaces must be enclosed in *single*
- * quotation marks. For example:<tt>
- * "keep-me and_me_to anotherNodeToBeKept \'name with whitespace\'"</tt>.
- * If a node matches on of these names, it will not be modified or
- * removed by the postprocessing step.<br>
- * This option might be useful if you are using some magic node names
- * to pass additional semantics through the content pipeline. This ensures
- * they won't be optimized away, but a general optimization is still
- * performed for nodes not contained in the list.
- * Property type: String. Default value: n/a
- * @note Linefeeds, tabs or carriage returns are treated as whitespace.
- *   Node names are case sensitive.
- */
-#define AI_CONFIG_PP_OG_EXCLUDE_LIST    \
-    "PP_OG_EXCLUDE_LIST"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the maximum number of triangles in a mesh.
- *
- * This is used by the "SplitLargeMeshes" PostProcess-Step to determine
- * whether a mesh must be split or not.
- * @note The default value is AI_SLM_DEFAULT_MAX_TRIANGLES
- * Property type: integer.
- */
-#define AI_CONFIG_PP_SLM_TRIANGLE_LIMIT \
-    "PP_SLM_TRIANGLE_LIMIT"
-
-// default value for AI_CONFIG_PP_SLM_TRIANGLE_LIMIT
-#if (!defined AI_SLM_DEFAULT_MAX_TRIANGLES)
-#   define AI_SLM_DEFAULT_MAX_TRIANGLES     1000000
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the maximum number of vertices in a mesh.
- *
- * This is used by the "SplitLargeMeshes" PostProcess-Step to determine
- * whether a mesh must be split or not.
- * @note The default value is AI_SLM_DEFAULT_MAX_VERTICES
- * Property type: integer.
- */
-#define AI_CONFIG_PP_SLM_VERTEX_LIMIT \
-    "PP_SLM_VERTEX_LIMIT"
-
-// default value for AI_CONFIG_PP_SLM_VERTEX_LIMIT
-#if (!defined AI_SLM_DEFAULT_MAX_VERTICES)
-#   define AI_SLM_DEFAULT_MAX_VERTICES      1000000
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Set the maximum number of bones affecting a single vertex
- *
- * This is used by the #aiProcess_LimitBoneWeights PostProcess-Step.
- * @note The default value is AI_LMW_MAX_WEIGHTS
- * Property type: integer.*/
-#define AI_CONFIG_PP_LBW_MAX_WEIGHTS    \
-    "PP_LBW_MAX_WEIGHTS"
-
-// default value for AI_CONFIG_PP_LBW_MAX_WEIGHTS
-#if (!defined AI_LMW_MAX_WEIGHTS)
-#   define AI_LMW_MAX_WEIGHTS   0x4
-#endif // !! AI_LMW_MAX_WEIGHTS
-
-// ---------------------------------------------------------------------------
-/** @brief Lower the deboning threshold in order to remove more bones.
- *
- * This is used by the #aiProcess_Debone PostProcess-Step.
- * @note The default value is AI_DEBONE_THRESHOLD
- * Property type: float.*/
-#define AI_CONFIG_PP_DB_THRESHOLD \
-    "PP_DB_THRESHOLD"
-
-// default value for AI_CONFIG_PP_LBW_MAX_WEIGHTS
-#if (!defined AI_DEBONE_THRESHOLD)
-#   define AI_DEBONE_THRESHOLD  1.0f
-#endif // !! AI_DEBONE_THRESHOLD
-
-// ---------------------------------------------------------------------------
-/** @brief Require all bones qualify for deboning before removing any
- *
- * This is used by the #aiProcess_Debone PostProcess-Step.
- * @note The default value is 0
- * Property type: bool.*/
-#define AI_CONFIG_PP_DB_ALL_OR_NONE \
-    "PP_DB_ALL_OR_NONE"
-
-/** @brief Default value for the #AI_CONFIG_PP_ICL_PTCACHE_SIZE property
- */
-#ifndef PP_ICL_PTCACHE_SIZE
-#   define PP_ICL_PTCACHE_SIZE 12
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Set the size of the post-transform vertex cache to optimize the
- *    vertices for. This configures the #aiProcess_ImproveCacheLocality step.
- *
- * The size is given in vertices. Of course you can't know how the vertex
- * format will exactly look like after the import returns, but you can still
- * guess what your meshes will probably have.
- * @note The default value is #PP_ICL_PTCACHE_SIZE. That results in slight
- * performance improvements for most nVidia/AMD cards since 2002.
- * Property type: integer.
- */
-#define AI_CONFIG_PP_ICL_PTCACHE_SIZE   "PP_ICL_PTCACHE_SIZE"
-
-// ---------------------------------------------------------------------------
-/** @brief Enumerates components of the aiScene and aiMesh data structures
- *  that can be excluded from the import using the #aiProcess_RemoveComponent step.
- *
- *  See the documentation to #aiProcess_RemoveComponent for more details.
- */
-enum aiComponent
-{
-    /** Normal vectors */
-#ifdef SWIG
-    aiComponent_NORMALS = 0x2,
-#else
-    aiComponent_NORMALS = 0x2u,
-#endif
-
-    /** Tangents and bitangents go always together ... */
-#ifdef SWIG
-    aiComponent_TANGENTS_AND_BITANGENTS = 0x4,
-#else
-    aiComponent_TANGENTS_AND_BITANGENTS = 0x4u,
-#endif
-
-    /** ALL color sets
-     * Use aiComponent_COLORn(N) to specify the N'th set */
-    aiComponent_COLORS = 0x8,
-
-    /** ALL texture UV sets
-     * aiComponent_TEXCOORDn(N) to specify the N'th set  */
-    aiComponent_TEXCOORDS = 0x10,
-
-    /** Removes all bone weights from all meshes.
-     * The scenegraph nodes corresponding to the bones are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_BONEWEIGHTS = 0x20,
-
-    /** Removes all node animations (aiScene::mAnimations).
-     * The corresponding scenegraph nodes are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_ANIMATIONS = 0x40,
-
-    /** Removes all embedded textures (aiScene::mTextures) */
-    aiComponent_TEXTURES = 0x80,
-
-    /** Removes all light sources (aiScene::mLights).
-     * The corresponding scenegraph nodes are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_LIGHTS = 0x100,
-
-    /** Removes all cameras (aiScene::mCameras).
-     * The corresponding scenegraph nodes are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_CAMERAS = 0x200,
-
-    /** Removes all meshes (aiScene::mMeshes). */
-    aiComponent_MESHES = 0x400,
-
-    /** Removes all materials. One default material will
-     * be generated, so aiScene::mNumMaterials will be 1. */
-    aiComponent_MATERIALS = 0x800,
-
-
-    /** This value is not used. It is just there to force the
-     *  compiler to map this enum to a 32 Bit integer. */
-#ifndef SWIG
-    _aiComponent_Force32Bit = 0x9fffffff
-#endif
-};
-
-// Remove a specific color channel 'n'
-#define aiComponent_COLORSn(n) (1u << (n+20u))
-
-// Remove a specific UV channel 'n'
-#define aiComponent_TEXCOORDSn(n) (1u << (n+25u))
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_RemoveComponent step:
- *  Specifies the parts of the data structure to be removed.
- *
- * See the documentation to this step for further details. The property
- * is expected to be an integer, a bitwise combination of the
- * #aiComponent flags defined above in this header. The default
- * value is 0. Important: if no valid mesh is remaining after the
- * step has been executed (e.g you thought it was funny to specify ALL
- * of the flags defined above) the import FAILS. Mainly because there is
- * no data to work on anymore ...
- */
-#define AI_CONFIG_PP_RVC_FLAGS              \
-    "PP_RVC_FLAGS"
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_SortByPType step:
- *  Specifies which primitive types are removed by the step.
- *
- *  This is a bitwise combination of the aiPrimitiveType flags.
- *  Specifying all of them is illegal, of course. A typical use would
- *  be to exclude all line and point meshes from the import. This
- *  is an integer property, its default value is 0.
- */
-#define AI_CONFIG_PP_SBP_REMOVE             \
-    "PP_SBP_REMOVE"
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_FindInvalidData step:
- *  Specifies the floating-point accuracy for animation values. The step
- *  checks for animation tracks where all frame values are absolutely equal
- *  and removes them. This tweakable controls the epsilon for floating-point
- *  comparisons - two keys are considered equal if the invariant
- *  abs(n0-n1)>epsilon holds true for all vector respectively quaternion
- *  components. The default value is 0.f - comparisons are exact then.
- */
-#define AI_CONFIG_PP_FID_ANIM_ACCURACY              \
-    "PP_FID_ANIM_ACCURACY"
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_FindInvalidData step:
- *  Set to true to ignore texture coordinates. This may be useful if you have
- *  to assign different kind of textures like one for the summer or one for the winter.
- */
-#define AI_CONFIG_PP_FID_IGNORE_TEXTURECOORDS        \
-    "PP_FID_IGNORE_TEXTURECOORDS"
-
-// TransformUVCoords evaluates UV scalings
-#define AI_UVTRAFO_SCALING 0x1
-
-// TransformUVCoords evaluates UV rotations
-#define AI_UVTRAFO_ROTATION 0x2
-
-// TransformUVCoords evaluates UV translation
-#define AI_UVTRAFO_TRANSLATION 0x4
-
-// Everything baked together -> default value
-#define AI_UVTRAFO_ALL (AI_UVTRAFO_SCALING | AI_UVTRAFO_ROTATION | AI_UVTRAFO_TRANSLATION)
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_TransformUVCoords step:
- *  Specifies which UV transformations are evaluated.
- *
- *  This is a bitwise combination of the AI_UVTRAFO_XXX flags (integer
- *  property, of course). By default all transformations are enabled
- * (AI_UVTRAFO_ALL).
- */
-#define AI_CONFIG_PP_TUV_EVALUATE               \
-    "PP_TUV_EVALUATE"
-
-// ---------------------------------------------------------------------------
-/** @brief A hint to assimp to favour speed against import quality.
- *
- * Enabling this option may result in faster loading, but it needn't.
- * It represents just a hint to loaders and post-processing steps to use
- * faster code paths, if possible.
- * This property is expected to be an integer, != 0 stands for true.
- * The default value is 0.
- */
-#define AI_CONFIG_FAVOUR_SPEED              \
- "FAVOUR_SPEED"
-
-
-// ###########################################################################
-// IMPORTER SETTINGS
-// Various stuff to fine-tune the behaviour of specific importer plugins.
-// ###########################################################################
-
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will merge all geometry layers present
- *    in the source file or take only the first.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_ALL_GEOMETRY_LAYERS \
-    "IMPORT_FBX_READ_ALL_GEOMETRY_LAYERS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read all materials present in the
- *    source file or take only the referenced materials.
- *
- * This is void unless IMPORT_FBX_READ_MATERIALS=1.
- *
- * The default value is false (0)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_ALL_MATERIALS \
-    "IMPORT_FBX_READ_ALL_MATERIALS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read materials.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_MATERIALS \
-    "IMPORT_FBX_READ_MATERIALS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read embedded textures.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_TEXTURES \
-    "IMPORT_FBX_READ_TEXTURES"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read cameras.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_CAMERAS \
-    "IMPORT_FBX_READ_CAMERAS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read light sources.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_LIGHTS \
-    "IMPORT_FBX_READ_LIGHTS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read animations.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_ANIMATIONS \
-    "IMPORT_FBX_READ_ANIMATIONS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will act in strict mode in which only
- *    FBX 2013 is supported and any other sub formats are rejected. FBX 2013
- *    is the primary target for the importer, so this format is best
- *    supported and well-tested.
- *
- * The default value is false (0)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_STRICT_MODE \
-    "IMPORT_FBX_STRICT_MODE"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will preserve pivot points for
- *    transformations (as extra nodes). If set to false, pivots and offsets
- *    will be evaluated whenever possible.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_PRESERVE_PIVOTS \
-    "IMPORT_FBX_PRESERVE_PIVOTS"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the importer will drop empty animation curves or
- *    animation curves which match the bind pose transformation over their
- *    entire defined range.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES \
-    "IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will use the legacy embedded texture naming.
- *
- * The default value is false (0)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_EMBEDDED_TEXTURES_LEGACY_NAMING \
-	"AI_CONFIG_IMPORT_FBX_EMBEDDED_TEXTURES_LEGACY_NAMING"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set wether the importer shall not remove empty bones.
- *  
- *  Empty bone are often used to define connections for other models.
- */
-#define AI_CONFIG_IMPORT_REMOVE_EMPTY_BONES \
-    "AI_CONFIG_IMPORT_REMOVE_EMPTY_BONES"
-
-
-// ---------------------------------------------------------------------------
-/** @brief  Set wether the FBX importer shall convert the unit from cm to m.
- */
-#define AI_CONFIG_FBX_CONVERT_TO_M \
-    "AI_CONFIG_FBX_CONVERT_TO_M"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the vertex animation keyframe to be imported
- *
- * ASSIMP does not support vertex keyframes (only bone animation is supported).
- * The library reads only one frame of models with vertex animations.
- * By default this is the first frame.
- * \note The default value is 0. This option applies to all importers.
- *   However, it is also possible to override the global setting
- *   for a specific loader. You can use the AI_CONFIG_IMPORT_XXX_KEYFRAME
- *   options (where XXX is a placeholder for the file format for which you
- *   want to override the global setting).
- * Property type: integer.
- */
-#define AI_CONFIG_IMPORT_GLOBAL_KEYFRAME    "IMPORT_GLOBAL_KEYFRAME"
-
-#define AI_CONFIG_IMPORT_MD3_KEYFRAME       "IMPORT_MD3_KEYFRAME"
-#define AI_CONFIG_IMPORT_MD2_KEYFRAME       "IMPORT_MD2_KEYFRAME"
-#define AI_CONFIG_IMPORT_MDL_KEYFRAME       "IMPORT_MDL_KEYFRAME"
-#define AI_CONFIG_IMPORT_MDC_KEYFRAME       "IMPORT_MDC_KEYFRAME"
-#define AI_CONFIG_IMPORT_SMD_KEYFRAME       "IMPORT_SMD_KEYFRAME"
-#define AI_CONFIG_IMPORT_UNREAL_KEYFRAME    "IMPORT_UNREAL_KEYFRAME"
-
-// ---------------------------------------------------------------------------
-/** Smd load multiple animations
- *
- *  Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_SMD_LOAD_ANIMATION_LIST "IMPORT_SMD_LOAD_ANIMATION_LIST"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the AC loader to collect all surfaces which have the
- *    "Backface cull" flag set in separate meshes.
- *
- *  Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_AC_SEPARATE_BFCULL \
-    "IMPORT_AC_SEPARATE_BFCULL"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures whether the AC loader evaluates subdivision surfaces (
- *  indicated by the presence of the 'subdiv' attribute in the file). By
- *  default, Assimp performs the subdivision using the standard
- *  Catmull-Clark algorithm
- *
- * * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_AC_EVAL_SUBDIVISION    \
-    "IMPORT_AC_EVAL_SUBDIVISION"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the UNREAL 3D loader to separate faces with different
- *    surface flags (e.g. two-sided vs. single-sided).
- *
- * * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_UNREAL_HANDLE_FLAGS \
-    "UNREAL_HANDLE_FLAGS"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the terragen import plugin to compute uv's for
- *  terrains, if not given. Furthermore a default texture is assigned.
- *
- * UV coordinates for terrains are so simple to compute that you'll usually
- * want to compute them on your own, if you need them. This option is intended
- * for model viewers which want to offer an easy way to apply textures to
- * terrains.
- * * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_TER_MAKE_UVS \
-    "IMPORT_TER_MAKE_UVS"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the ASE loader to always reconstruct normal vectors
- *  basing on the smoothing groups loaded from the file.
- *
- * Some ASE files have carry invalid normals, other don't.
- * * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_ASE_RECONSTRUCT_NORMALS    \
-    "IMPORT_ASE_RECONSTRUCT_NORMALS"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the M3D loader to detect and process multi-part
- *    Quake player models.
- *
- * These models usually consist of 3 files, lower.md3, upper.md3 and
- * head.md3. If this property is set to true, Assimp will try to load and
- * combine all three files if one of them is loaded.
- * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_MD3_HANDLE_MULTIPART \
-    "IMPORT_MD3_HANDLE_MULTIPART"
-
-// ---------------------------------------------------------------------------
-/** @brief  Tells the MD3 loader which skin files to load.
- *
- * When loading MD3 files, Assimp checks whether a file
- * [md3_file_name]_[skin_name].skin is existing. These files are used by
- * Quake III to be able to assign different skins (e.g. red and blue team)
- * to models. 'default', 'red', 'blue' are typical skin names.
- * Property type: String. Default value: "default".
- */
-#define AI_CONFIG_IMPORT_MD3_SKIN_NAME \
-    "IMPORT_MD3_SKIN_NAME"
-
-// ---------------------------------------------------------------------------
-/** @brief  Specify the Quake 3 shader file to be used for a particular
- *  MD3 file. This can also be a search path.
- *
- * By default Assimp's behaviour is as follows: If a MD3 file
- * <tt>any_path/models/any_q3_subdir/model_name/file_name.md3</tt> is
- * loaded, the library tries to locate the corresponding shader file in
- * <tt>any_path/scripts/model_name.shader</tt>. This property overrides this
- * behaviour. It can either specify a full path to the shader to be loaded
- * or alternatively the path (relative or absolute) to the directory where
- * the shaders for all MD3s to be loaded reside. Assimp attempts to open
- * <tt>IMPORT_MD3_SHADER_SRC/model_name.shader</tt> first, <tt>IMPORT_MD3_SHADER_SRC/file_name.shader</tt>
- * is the fallback file. Note that IMPORT_MD3_SHADER_SRC should have a terminal (back)slash.
- * Property type: String. Default value: n/a.
- */
-#define AI_CONFIG_IMPORT_MD3_SHADER_SRC \
-    "IMPORT_MD3_SHADER_SRC"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the LWO loader to load just one layer from the model.
- *
- * LWO files consist of layers and in some cases it could be useful to load
- * only one of them. This property can be either a string - which specifies
- * the name of the layer - or an integer - the index of the layer. If the
- * property is not set the whole LWO model is loaded. Loading fails if the
- * requested layer is not available. The layer index is zero-based and the
- * layer name may not be empty.<br>
- * Property type: Integer. Default value: all layers are loaded.
- */
-#define AI_CONFIG_IMPORT_LWO_ONE_LAYER_ONLY         \
-    "IMPORT_LWO_ONE_LAYER_ONLY"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the MD5 loader to not load the MD5ANIM file for
- *  a MD5MESH file automatically.
- *
- * The default strategy is to look for a file with the same name but the
- * MD5ANIM extension in the same directory. If it is found, it is loaded
- * and combined with the MD5MESH file. This configuration option can be
- * used to disable this behaviour.
- *
- * * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_MD5_NO_ANIM_AUTOLOAD           \
-    "IMPORT_MD5_NO_ANIM_AUTOLOAD"
-
-// ---------------------------------------------------------------------------
-/** @brief Defines the begin of the time range for which the LWS loader
- *    evaluates animations and computes aiNodeAnim's.
- *
- * Assimp provides full conversion of LightWave's envelope system, including
- * pre and post conditions. The loader computes linearly subsampled animation
- * chanels with the frame rate given in the LWS file. This property defines
- * the start time. Note: animation channels are only generated if a node
- * has at least one envelope with more tan one key assigned. This property.
- * is given in frames, '0' is the first frame. By default, if this property
- * is not set, the importer takes the animation start from the input LWS
- * file ('FirstFrame' line)<br>
- * Property type: Integer. Default value: taken from file.
- *
- * @see AI_CONFIG_IMPORT_LWS_ANIM_END - end of the imported time range
- */
-#define AI_CONFIG_IMPORT_LWS_ANIM_START         \
-    "IMPORT_LWS_ANIM_START"
-#define AI_CONFIG_IMPORT_LWS_ANIM_END           \
-    "IMPORT_LWS_ANIM_END"
-
-// ---------------------------------------------------------------------------
-/** @brief Defines the output frame rate of the IRR loader.
- *
- * IRR animations are difficult to convert for Assimp and there will
- * always be a loss of quality. This setting defines how many keys per second
- * are returned by the converter.<br>
- * Property type: integer. Default value: 100
- */
-#define AI_CONFIG_IMPORT_IRR_ANIM_FPS               \
-    "IMPORT_IRR_ANIM_FPS"
-
-// ---------------------------------------------------------------------------
-/** @brief Ogre Importer will try to find referenced materials from this file.
- *
- * Ogre meshes reference with material names, this does not tell Assimp the file
- * where it is located in. Assimp will try to find the source file in the following
- * order: <material-name>.material, <mesh-filename-base>.material and
- * lastly the material name defined by this config property.
- * <br>
- * Property type: String. Default value: Scene.material.
- */
-#define AI_CONFIG_IMPORT_OGRE_MATERIAL_FILE \
-    "IMPORT_OGRE_MATERIAL_FILE"
-
-// ---------------------------------------------------------------------------
-/** @brief Ogre Importer detect the texture usage from its filename.
- *
- * Ogre material texture units do not define texture type, the textures usage
- * depends on the used shader or Ogre's fixed pipeline. If this config property
- * is true Assimp will try to detect the type from the textures filename postfix:
- * _n, _nrm, _nrml, _normal, _normals and _normalmap for normal map, _s, _spec,
- * _specular and _specularmap for specular map, _l, _light, _lightmap, _occ
- * and _occlusion for light map, _disp and _displacement for displacement map.
- * The matching is case insensitive. Post fix is taken between the last
- * underscore and the last period.
- * Default behavior is to detect type from lower cased texture unit name by
- * matching against: normalmap, specularmap, lightmap and displacementmap.
- * For both cases if no match is found aiTextureType_DIFFUSE is used.
- * <br>
- * Property type: Bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_OGRE_TEXTURETYPE_FROM_FILENAME \
-    "IMPORT_OGRE_TEXTURETYPE_FROM_FILENAME"
-
- /** @brief Specifies whether the Android JNI asset extraction is supported.
-  *
-  * Turn on this option if you want to manage assets in native
-  * Android application without having to keep the internal directory and asset
-  * manager pointer.
-  */
- #define AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT "AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the IFC loader skips over IfcSpace elements.
- *
- * IfcSpace elements (and their geometric representations) are used to
- * represent, well, free space in a building storey.<br>
- * Property type: Bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS "IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the IFC loader will use its own, custom triangulation
- *   algorithm to triangulate wall and floor meshes.
- *
- * If this property is set to false, walls will be either triangulated by
- * #aiProcess_Triangulate or will be passed through as huge polygons with
- * faked holes (i.e. holes that are connected with the outer boundary using
- * a dummy edge). It is highly recommended to set this property to true
- * if you want triangulated data because #aiProcess_Triangulate is known to
- * have problems with the kind of polygons that the IFC loader spits out for
- * complicated meshes.
- * Property type: Bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_IFC_CUSTOM_TRIANGULATION "IMPORT_IFC_CUSTOM_TRIANGULATION"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the tessellation conic angle for IFC smoothing curves.
- *
- * This is used by the IFC importer to determine the tessellation parameter
- * for smoothing curves.
- * @note The default value is AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE and the
- * accepted values are in range [5.0, 120.0].
- * Property type: Float.
- */
-#define AI_CONFIG_IMPORT_IFC_SMOOTHING_ANGLE "IMPORT_IFC_SMOOTHING_ANGLE"
-
-// default value for AI_CONFIG_IMPORT_IFC_SMOOTHING_ANGLE
-#if (!defined AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE)
-#   define AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE 10.0f
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the tessellation for IFC cylindrical shapes.
- *
- * This is used by the IFC importer to determine the tessellation parameter
- * for cylindrical shapes, i.e. the number of segments used to approximate a circle.
- * @note The default value is AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION and the
- * accepted values are in range [3, 180].
- * Property type: Integer.
- */
-#define AI_CONFIG_IMPORT_IFC_CYLINDRICAL_TESSELLATION "IMPORT_IFC_CYLINDRICAL_TESSELLATION"
-
-// default value for AI_CONFIG_IMPORT_IFC_CYLINDRICAL_TESSELLATION
-#if (!defined AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION)
-#   define AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION 32
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the Collada loader will ignore the provided up direction.
- *
- * If this property is set to true, the up direction provided in the file header will
- * be ignored and the file will be loaded as is.
- * Property type: Bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_COLLADA_IGNORE_UP_DIRECTION "IMPORT_COLLADA_IGNORE_UP_DIRECTION"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the Collada loader should use Collada names as node names.
- *
- * If this property is set to true, the Collada names will be used as the
- * node name. The default is to use the id tag (resp. sid tag, if no id tag is present)
- * instead.
- * Property type: Bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_COLLADA_USE_COLLADA_NAMES "IMPORT_COLLADA_USE_COLLADA_NAMES"
-
-// ---------- All the Export defines ------------
-
-/** @brief Specifies the xfile use double for real values of float
- *
- * Property type: Bool. Default value: false.
- */
-
-#define AI_CONFIG_EXPORT_XFILE_64BIT "EXPORT_XFILE_64BIT"
-
-/** @brief Specifies whether the assimp export shall be able to export point clouds
- * 
- *  When this flag is not defined the render data has to contain valid faces.
- *  Point clouds are only a collection of vertices which have nor spatial organization
- *  by a face and the validation process will remove them. Enabling this feature will
- *  switch off the flag and enable the functionality to export pure point clouds.
- */
-#define AI_CONFIG_EXPORT_POINT_CLOUDS "EXPORT_POINT_CLOUDS"
-
-/**
- *  @brief  Specifies a gobal key factor for scale, float value
- */
-#define AI_CONFIG_GLOBAL_SCALE_FACTOR_KEY "GLOBAL_SCALE_FACTOR"
-
-#if (!defined AI_CONFIG_GLOBAL_SCALE_FACTOR_DEFAULT)
-#   define AI_CONFIG_GLOBAL_SCALE_FACTOR_DEFAULT  1.0f
-#endif // !! AI_DEBONE_THRESHOLD
-
-#define AI_CONFIG_APP_SCALE_KEY "APP_SCALE_FACTOR"
-
-#if (!defined AI_CONFIG_APP_SCALE_KEY)
-#   define AI_CONFIG_APP_SCALE_KEY 1.0
-#endif // AI_CONFIG_APP_SCALE_KEY
-
-
-// ---------- All the Build/Compile-time defines ------------
-
-/** @brief Specifies if double precision is supported inside assimp
- *
- * Property type: Bool. Default value: undefined.
- */
-
-/* #undef ASSIMP_DOUBLE_PRECISION */
-
-#endif // !! AI_CONFIG_H_INC
diff --git a/thirdparty/assimp/include/assimp/config.h.in b/thirdparty/assimp/include/assimp/config.h.in
deleted file mode 100644
index 3a6379bf40..0000000000
--- a/thirdparty/assimp/include/assimp/config.h.in
+++ /dev/null
@@ -1,1018 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2018, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file config.h
- *  @brief Defines constants for configurable properties for the library
- *
- *  Typically these properties are set via
- *  #Assimp::Importer::SetPropertyFloat,
- *  #Assimp::Importer::SetPropertyInteger or
- *  #Assimp::Importer::SetPropertyString,
- *  depending on the data type of a property. All properties have a
- *  default value. See the doc for the mentioned methods for more details.
- *
- *  <br><br>
- *  The corresponding functions for use with the plain-c API are:
- *  #aiSetImportPropertyInteger,
- *  #aiSetImportPropertyFloat,
- *  #aiSetImportPropertyString
- */
-#pragma once
-#ifndef AI_CONFIG_H_INC
-#define AI_CONFIG_H_INC
-
-
-// ###########################################################################
-// LIBRARY SETTINGS
-// General, global settings
-// ###########################################################################
-
-// ---------------------------------------------------------------------------
-/** @brief Enables time measurements.
- *
- *  If enabled, measures the time needed for each part of the loading
- *  process (i.e. IO time, importing, postprocessing, ..) and dumps
- *  these timings to the DefaultLogger. See the @link perf Performance
- *  Page@endlink for more information on this topic.
- *
- * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_GLOB_MEASURE_TIME  \
-    "GLOB_MEASURE_TIME"
-
-
-// ---------------------------------------------------------------------------
-/** @brief Global setting to disable generation of skeleton dummy meshes
- *
- * Skeleton dummy meshes are generated as a visualization aid in cases which
- * the input data contains no geometry, but only animation data.
- * Property data type: bool. Default value: false
- */
-// ---------------------------------------------------------------------------
-#define AI_CONFIG_IMPORT_NO_SKELETON_MESHES \
-    "IMPORT_NO_SKELETON_MESHES"
-
-
-
-# if 0 // not implemented yet
-// ---------------------------------------------------------------------------
-/** @brief Set Assimp's multithreading policy.
- *
- * This setting is ignored if Assimp was built without boost.thread
- * support (ASSIMP_BUILD_NO_THREADING, which is implied by ASSIMP_BUILD_BOOST_WORKAROUND).
- * Possible values are: -1 to let Assimp decide what to do, 0 to disable
- * multithreading entirely and any number larger than 0 to force a specific
- * number of threads. Assimp is always free to ignore this settings, which is
- * merely a hint. Usually, the default value (-1) will be fine. However, if
- * Assimp is used concurrently from multiple user threads, it might be useful
- * to limit each Importer instance to a specific number of cores.
- *
- * For more information, see the @link threading Threading page@endlink.
- * Property type: int, default value: -1.
- */
-#define AI_CONFIG_GLOB_MULTITHREADING  \
-    "GLOB_MULTITHREADING"
-#endif
-
-// ###########################################################################
-// POST PROCESSING SETTINGS
-// Various stuff to fine-tune the behavior of a specific post processing step.
-// ###########################################################################
-
-
-// ---------------------------------------------------------------------------
-/** @brief Maximum bone count per mesh for the SplitbyBoneCount step.
- *
- * Meshes are split until the maximum number of bones is reached. The default
- * value is AI_SBBC_DEFAULT_MAX_BONES, which may be altered at
- * compile-time.
- * Property data type: integer.
- */
-// ---------------------------------------------------------------------------
-#define AI_CONFIG_PP_SBBC_MAX_BONES \
-    "PP_SBBC_MAX_BONES"
-
-
-// default limit for bone count
-#if (!defined AI_SBBC_DEFAULT_MAX_BONES)
-#   define AI_SBBC_DEFAULT_MAX_BONES        60
-#endif
-
-
-// ---------------------------------------------------------------------------
-/** @brief  Specifies the maximum angle that may be between two vertex tangents
- *         that their tangents and bi-tangents are smoothed.
- *
- * This applies to the CalcTangentSpace-Step. The angle is specified
- * in degrees. The maximum value is 175.
- * Property type: float. Default value: 45 degrees
- */
-#define AI_CONFIG_PP_CT_MAX_SMOOTHING_ANGLE \
-    "PP_CT_MAX_SMOOTHING_ANGLE"
-
-// ---------------------------------------------------------------------------
-/** @brief Source UV channel for tangent space computation.
- *
- * The specified channel must exist or an error will be raised.
- * Property type: integer. Default value: 0
- */
-// ---------------------------------------------------------------------------
-#define AI_CONFIG_PP_CT_TEXTURE_CHANNEL_INDEX \
-    "PP_CT_TEXTURE_CHANNEL_INDEX"
-
-// ---------------------------------------------------------------------------
-/** @brief  Specifies the maximum angle that may be between two face normals
- *          at the same vertex position that their are smoothed together.
- *
- * Sometimes referred to as 'crease angle'.
- * This applies to the GenSmoothNormals-Step. The angle is specified
- * in degrees, so 180 is PI. The default value is 175 degrees (all vertex
- * normals are smoothed). The maximum value is 175, too. Property type: float.
- * Warning: setting this option may cause a severe loss of performance. The
- * performance is unaffected if the #AI_CONFIG_FAVOUR_SPEED flag is set but
- * the output quality may be reduced.
- */
-#define AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE \
-    "PP_GSN_MAX_SMOOTHING_ANGLE"
-
-
-// ---------------------------------------------------------------------------
-/** @brief Sets the colormap (= palette) to be used to decode embedded
- *         textures in MDL (Quake or 3DGS) files.
- *
- * This must be a valid path to a file. The file is 768 (256*3) bytes
- * large and contains RGB triplets for each of the 256 palette entries.
- * The default value is colormap.lmp. If the file is not found,
- * a default palette (from Quake 1) is used.
- * Property type: string.
- */
-#define AI_CONFIG_IMPORT_MDL_COLORMAP       \
-    "IMPORT_MDL_COLORMAP"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_RemoveRedundantMaterials step to
- *  keep materials matching a name in a given list.
- *
- * This is a list of 1 to n strings, ' ' serves as delimiter character.
- * Identifiers containing whitespaces must be enclosed in *single*
- * quotation marks. For example:<tt>
- * "keep-me and_me_to anotherMaterialToBeKept \'name with whitespace\'"</tt>.
- * If a material matches on of these names, it will not be modified or
- * removed by the postprocessing step nor will other materials be replaced
- * by a reference to it. <br>
- * This option might be useful if you are using some magic material names
- * to pass additional semantics through the content pipeline. This ensures
- * they won't be optimized away, but a general optimization is still
- * performed for materials not contained in the list.
- * Property type: String. Default value: n/a
- * @note Linefeeds, tabs or carriage returns are treated as whitespace.
- *   Material names are case sensitive.
- */
-#define AI_CONFIG_PP_RRM_EXCLUDE_LIST   \
-    "PP_RRM_EXCLUDE_LIST"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to
- *  keep the scene hierarchy. Meshes are moved to worldspace, but
- *  no optimization is performed (read: meshes with equal materials are not
- *  joined. The total number of meshes won't change).
- *
- * This option could be of use for you if the scene hierarchy contains
- * important additional information which you intend to parse.
- * For rendering, you can still render all meshes in the scene without
- * any transformations.
- * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_PP_PTV_KEEP_HIERARCHY     \
-    "PP_PTV_KEEP_HIERARCHY"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to normalize
- *  all vertex components into the [-1,1] range. That is, a bounding box
- *  for the whole scene is computed, the maximum component is taken and all
- *  meshes are scaled appropriately (uniformly of course!).
- *  This might be useful if you don't know the spatial dimension of the input
- *  data*/
-#define AI_CONFIG_PP_PTV_NORMALIZE  \
-    "PP_PTV_NORMALIZE"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to use
- *  a users defined matrix as the scene root node transformation before
- *  transforming vertices.
- *  Property type: bool. Default value: false.
- */
-#define AI_CONFIG_PP_PTV_ADD_ROOT_TRANSFORMATION    \
-    "PP_PTV_ADD_ROOT_TRANSFORMATION"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_PreTransformVertices step to use
- *  a users defined matrix as the scene root node transformation before
- *  transforming vertices. This property correspond to the 'a1' component
- *  of the transformation matrix.
- *  Property type: aiMatrix4x4.
- */
-#define AI_CONFIG_PP_PTV_ROOT_TRANSFORMATION    \
-    "PP_PTV_ROOT_TRANSFORMATION"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_FindDegenerates step to
- *  remove degenerated primitives from the import - immediately.
- *
- * The default behaviour converts degenerated triangles to lines and
- * degenerated lines to points. See the documentation to the
- * #aiProcess_FindDegenerates step for a detailed example of the various ways
- * to get rid of these lines and points if you don't want them.
- * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_PP_FD_REMOVE \
-    "PP_FD_REMOVE"
-
-// ---------------------------------------------------------------------------
-/**
- *  @brief  Configures the #aiProcess_FindDegenerates to check the area of a
- *  trinagle to be greates than e-6. If this is not the case the triangle will
- *  be removed if #AI_CONFIG_PP_FD_REMOVE is set to true.
- */
-#define AI_CONFIG_PP_FD_CHECKAREA \
-    "PP_FD_CHECKAREA"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the #aiProcess_OptimizeGraph step to preserve nodes
- * matching a name in a given list.
- *
- * This is a list of 1 to n strings, ' ' serves as delimiter character.
- * Identifiers containing whitespaces must be enclosed in *single*
- * quotation marks. For example:<tt>
- * "keep-me and_me_to anotherNodeToBeKept \'name with whitespace\'"</tt>.
- * If a node matches on of these names, it will not be modified or
- * removed by the postprocessing step.<br>
- * This option might be useful if you are using some magic node names
- * to pass additional semantics through the content pipeline. This ensures
- * they won't be optimized away, but a general optimization is still
- * performed for nodes not contained in the list.
- * Property type: String. Default value: n/a
- * @note Linefeeds, tabs or carriage returns are treated as whitespace.
- *   Node names are case sensitive.
- */
-#define AI_CONFIG_PP_OG_EXCLUDE_LIST    \
-    "PP_OG_EXCLUDE_LIST"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the maximum number of triangles in a mesh.
- *
- * This is used by the "SplitLargeMeshes" PostProcess-Step to determine
- * whether a mesh must be split or not.
- * @note The default value is AI_SLM_DEFAULT_MAX_TRIANGLES
- * Property type: integer.
- */
-#define AI_CONFIG_PP_SLM_TRIANGLE_LIMIT \
-    "PP_SLM_TRIANGLE_LIMIT"
-
-// default value for AI_CONFIG_PP_SLM_TRIANGLE_LIMIT
-#if (!defined AI_SLM_DEFAULT_MAX_TRIANGLES)
-#   define AI_SLM_DEFAULT_MAX_TRIANGLES     1000000
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the maximum number of vertices in a mesh.
- *
- * This is used by the "SplitLargeMeshes" PostProcess-Step to determine
- * whether a mesh must be split or not.
- * @note The default value is AI_SLM_DEFAULT_MAX_VERTICES
- * Property type: integer.
- */
-#define AI_CONFIG_PP_SLM_VERTEX_LIMIT \
-    "PP_SLM_VERTEX_LIMIT"
-
-// default value for AI_CONFIG_PP_SLM_VERTEX_LIMIT
-#if (!defined AI_SLM_DEFAULT_MAX_VERTICES)
-#   define AI_SLM_DEFAULT_MAX_VERTICES      1000000
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Set the maximum number of bones affecting a single vertex
- *
- * This is used by the #aiProcess_LimitBoneWeights PostProcess-Step.
- * @note The default value is AI_LMW_MAX_WEIGHTS
- * Property type: integer.*/
-#define AI_CONFIG_PP_LBW_MAX_WEIGHTS    \
-    "PP_LBW_MAX_WEIGHTS"
-
-// default value for AI_CONFIG_PP_LBW_MAX_WEIGHTS
-#if (!defined AI_LMW_MAX_WEIGHTS)
-#   define AI_LMW_MAX_WEIGHTS   0x4
-#endif // !! AI_LMW_MAX_WEIGHTS
-
-// ---------------------------------------------------------------------------
-/** @brief Lower the deboning threshold in order to remove more bones.
- *
- * This is used by the #aiProcess_Debone PostProcess-Step.
- * @note The default value is AI_DEBONE_THRESHOLD
- * Property type: float.*/
-#define AI_CONFIG_PP_DB_THRESHOLD \
-    "PP_DB_THRESHOLD"
-
-// default value for AI_CONFIG_PP_LBW_MAX_WEIGHTS
-#if (!defined AI_DEBONE_THRESHOLD)
-#   define AI_DEBONE_THRESHOLD  1.0f
-#endif // !! AI_DEBONE_THRESHOLD
-
-// ---------------------------------------------------------------------------
-/** @brief Require all bones qualify for deboning before removing any
- *
- * This is used by the #aiProcess_Debone PostProcess-Step.
- * @note The default value is 0
- * Property type: bool.*/
-#define AI_CONFIG_PP_DB_ALL_OR_NONE \
-    "PP_DB_ALL_OR_NONE"
-
-/** @brief Default value for the #AI_CONFIG_PP_ICL_PTCACHE_SIZE property
- */
-#ifndef PP_ICL_PTCACHE_SIZE
-#   define PP_ICL_PTCACHE_SIZE 12
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Set the size of the post-transform vertex cache to optimize the
- *    vertices for. This configures the #aiProcess_ImproveCacheLocality step.
- *
- * The size is given in vertices. Of course you can't know how the vertex
- * format will exactly look like after the import returns, but you can still
- * guess what your meshes will probably have.
- * @note The default value is #PP_ICL_PTCACHE_SIZE. That results in slight
- * performance improvements for most nVidia/AMD cards since 2002.
- * Property type: integer.
- */
-#define AI_CONFIG_PP_ICL_PTCACHE_SIZE   "PP_ICL_PTCACHE_SIZE"
-
-// ---------------------------------------------------------------------------
-/** @brief Enumerates components of the aiScene and aiMesh data structures
- *  that can be excluded from the import using the #aiProcess_RemoveComponent step.
- *
- *  See the documentation to #aiProcess_RemoveComponent for more details.
- */
-enum aiComponent
-{
-    /** Normal vectors */
-#ifdef SWIG
-    aiComponent_NORMALS = 0x2,
-#else
-    aiComponent_NORMALS = 0x2u,
-#endif
-
-    /** Tangents and bitangents go always together ... */
-#ifdef SWIG
-    aiComponent_TANGENTS_AND_BITANGENTS = 0x4,
-#else
-    aiComponent_TANGENTS_AND_BITANGENTS = 0x4u,
-#endif
-
-    /** ALL color sets
-     * Use aiComponent_COLORn(N) to specify the N'th set */
-    aiComponent_COLORS = 0x8,
-
-    /** ALL texture UV sets
-     * aiComponent_TEXCOORDn(N) to specify the N'th set  */
-    aiComponent_TEXCOORDS = 0x10,
-
-    /** Removes all bone weights from all meshes.
-     * The scenegraph nodes corresponding to the bones are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_BONEWEIGHTS = 0x20,
-
-    /** Removes all node animations (aiScene::mAnimations).
-     * The corresponding scenegraph nodes are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_ANIMATIONS = 0x40,
-
-    /** Removes all embedded textures (aiScene::mTextures) */
-    aiComponent_TEXTURES = 0x80,
-
-    /** Removes all light sources (aiScene::mLights).
-     * The corresponding scenegraph nodes are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_LIGHTS = 0x100,
-
-    /** Removes all cameras (aiScene::mCameras).
-     * The corresponding scenegraph nodes are NOT removed.
-     * use the #aiProcess_OptimizeGraph step to do this */
-    aiComponent_CAMERAS = 0x200,
-
-    /** Removes all meshes (aiScene::mMeshes). */
-    aiComponent_MESHES = 0x400,
-
-    /** Removes all materials. One default material will
-     * be generated, so aiScene::mNumMaterials will be 1. */
-    aiComponent_MATERIALS = 0x800,
-
-
-    /** This value is not used. It is just there to force the
-     *  compiler to map this enum to a 32 Bit integer. */
-#ifndef SWIG
-    _aiComponent_Force32Bit = 0x9fffffff
-#endif
-};
-
-// Remove a specific color channel 'n'
-#define aiComponent_COLORSn(n) (1u << (n+20u))
-
-// Remove a specific UV channel 'n'
-#define aiComponent_TEXCOORDSn(n) (1u << (n+25u))
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_RemoveComponent step:
- *  Specifies the parts of the data structure to be removed.
- *
- * See the documentation to this step for further details. The property
- * is expected to be an integer, a bitwise combination of the
- * #aiComponent flags defined above in this header. The default
- * value is 0. Important: if no valid mesh is remaining after the
- * step has been executed (e.g you thought it was funny to specify ALL
- * of the flags defined above) the import FAILS. Mainly because there is
- * no data to work on anymore ...
- */
-#define AI_CONFIG_PP_RVC_FLAGS              \
-    "PP_RVC_FLAGS"
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_SortByPType step:
- *  Specifies which primitive types are removed by the step.
- *
- *  This is a bitwise combination of the aiPrimitiveType flags.
- *  Specifying all of them is illegal, of course. A typical use would
- *  be to exclude all line and point meshes from the import. This
- *  is an integer property, its default value is 0.
- */
-#define AI_CONFIG_PP_SBP_REMOVE             \
-    "PP_SBP_REMOVE"
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_FindInvalidData step:
- *  Specifies the floating-point accuracy for animation values. The step
- *  checks for animation tracks where all frame values are absolutely equal
- *  and removes them. This tweakable controls the epsilon for floating-point
- *  comparisons - two keys are considered equal if the invariant
- *  abs(n0-n1)>epsilon holds true for all vector respectively quaternion
- *  components. The default value is 0.f - comparisons are exact then.
- */
-#define AI_CONFIG_PP_FID_ANIM_ACCURACY              \
-    "PP_FID_ANIM_ACCURACY"
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_FindInvalidData step:
- *  Set to true to ignore texture coordinates. This may be useful if you have
- *  to assign different kind of textures like one for the summer or one for the winter.
- */
-#define AI_CONFIG_PP_FID_IGNORE_TEXTURECOORDS        \
-    "PP_FID_IGNORE_TEXTURECOORDS"
-
-// TransformUVCoords evaluates UV scalings
-#define AI_UVTRAFO_SCALING 0x1
-
-// TransformUVCoords evaluates UV rotations
-#define AI_UVTRAFO_ROTATION 0x2
-
-// TransformUVCoords evaluates UV translation
-#define AI_UVTRAFO_TRANSLATION 0x4
-
-// Everything baked together -> default value
-#define AI_UVTRAFO_ALL (AI_UVTRAFO_SCALING | AI_UVTRAFO_ROTATION | AI_UVTRAFO_TRANSLATION)
-
-// ---------------------------------------------------------------------------
-/** @brief Input parameter to the #aiProcess_TransformUVCoords step:
- *  Specifies which UV transformations are evaluated.
- *
- *  This is a bitwise combination of the AI_UVTRAFO_XXX flags (integer
- *  property, of course). By default all transformations are enabled
- * (AI_UVTRAFO_ALL).
- */
-#define AI_CONFIG_PP_TUV_EVALUATE               \
-    "PP_TUV_EVALUATE"
-
-// ---------------------------------------------------------------------------
-/** @brief A hint to assimp to favour speed against import quality.
- *
- * Enabling this option may result in faster loading, but it needn't.
- * It represents just a hint to loaders and post-processing steps to use
- * faster code paths, if possible.
- * This property is expected to be an integer, != 0 stands for true.
- * The default value is 0.
- */
-#define AI_CONFIG_FAVOUR_SPEED              \
- "FAVOUR_SPEED"
-
-
-// ###########################################################################
-// IMPORTER SETTINGS
-// Various stuff to fine-tune the behaviour of specific importer plugins.
-// ###########################################################################
-
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will merge all geometry layers present
- *    in the source file or take only the first.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_ALL_GEOMETRY_LAYERS \
-    "IMPORT_FBX_READ_ALL_GEOMETRY_LAYERS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read all materials present in the
- *    source file or take only the referenced materials.
- *
- * This is void unless IMPORT_FBX_READ_MATERIALS=1.
- *
- * The default value is false (0)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_ALL_MATERIALS \
-    "IMPORT_FBX_READ_ALL_MATERIALS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read materials.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_MATERIALS \
-    "IMPORT_FBX_READ_MATERIALS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read embedded textures.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_TEXTURES \
-    "IMPORT_FBX_READ_TEXTURES"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read cameras.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_CAMERAS \
-    "IMPORT_FBX_READ_CAMERAS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read light sources.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_LIGHTS \
-    "IMPORT_FBX_READ_LIGHTS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will read animations.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_READ_ANIMATIONS \
-    "IMPORT_FBX_READ_ANIMATIONS"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will act in strict mode in which only
- *    FBX 2013 is supported and any other sub formats are rejected. FBX 2013
- *    is the primary target for the importer, so this format is best
- *    supported and well-tested.
- *
- * The default value is false (0)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_STRICT_MODE \
-    "IMPORT_FBX_STRICT_MODE"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will preserve pivot points for
- *    transformations (as extra nodes). If set to false, pivots and offsets
- *    will be evaluated whenever possible.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_PRESERVE_PIVOTS \
-    "IMPORT_FBX_PRESERVE_PIVOTS"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the importer will drop empty animation curves or
- *    animation curves which match the bind pose transformation over their
- *    entire defined range.
- *
- * The default value is true (1)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES \
-    "IMPORT_FBX_OPTIMIZE_EMPTY_ANIMATION_CURVES"
-
-// ---------------------------------------------------------------------------
-/** @brief Set whether the fbx importer will use the legacy embedded texture naming.
- *
- * The default value is false (0)
- * Property type: bool
- */
-#define AI_CONFIG_IMPORT_FBX_EMBEDDED_TEXTURES_LEGACY_NAMING \
-	"AI_CONFIG_IMPORT_FBX_EMBEDDED_TEXTURES_LEGACY_NAMING"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set wether the importer shall not remove empty bones.
- *  
- *  Empty bone are often used to define connections for other models.
- */
-#define AI_CONFIG_IMPORT_REMOVE_EMPTY_BONES \
-    "AI_CONFIG_IMPORT_REMOVE_EMPTY_BONES"
-
-
-// ---------------------------------------------------------------------------
-/** @brief  Set wether the FBX importer shall convert the unit from cm to m.
- */
-#define AI_CONFIG_FBX_CONVERT_TO_M \
-    "AI_CONFIG_FBX_CONVERT_TO_M"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the vertex animation keyframe to be imported
- *
- * ASSIMP does not support vertex keyframes (only bone animation is supported).
- * The library reads only one frame of models with vertex animations.
- * By default this is the first frame.
- * \note The default value is 0. This option applies to all importers.
- *   However, it is also possible to override the global setting
- *   for a specific loader. You can use the AI_CONFIG_IMPORT_XXX_KEYFRAME
- *   options (where XXX is a placeholder for the file format for which you
- *   want to override the global setting).
- * Property type: integer.
- */
-#define AI_CONFIG_IMPORT_GLOBAL_KEYFRAME    "IMPORT_GLOBAL_KEYFRAME"
-
-#define AI_CONFIG_IMPORT_MD3_KEYFRAME       "IMPORT_MD3_KEYFRAME"
-#define AI_CONFIG_IMPORT_MD2_KEYFRAME       "IMPORT_MD2_KEYFRAME"
-#define AI_CONFIG_IMPORT_MDL_KEYFRAME       "IMPORT_MDL_KEYFRAME"
-#define AI_CONFIG_IMPORT_MDC_KEYFRAME       "IMPORT_MDC_KEYFRAME"
-#define AI_CONFIG_IMPORT_SMD_KEYFRAME       "IMPORT_SMD_KEYFRAME"
-#define AI_CONFIG_IMPORT_UNREAL_KEYFRAME    "IMPORT_UNREAL_KEYFRAME"
-
-// ---------------------------------------------------------------------------
-/** Smd load multiple animations
- *
- *  Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_SMD_LOAD_ANIMATION_LIST "IMPORT_SMD_LOAD_ANIMATION_LIST"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the AC loader to collect all surfaces which have the
- *    "Backface cull" flag set in separate meshes.
- *
- *  Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_AC_SEPARATE_BFCULL \
-    "IMPORT_AC_SEPARATE_BFCULL"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures whether the AC loader evaluates subdivision surfaces (
- *  indicated by the presence of the 'subdiv' attribute in the file). By
- *  default, Assimp performs the subdivision using the standard
- *  Catmull-Clark algorithm
- *
- * * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_AC_EVAL_SUBDIVISION    \
-    "IMPORT_AC_EVAL_SUBDIVISION"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the UNREAL 3D loader to separate faces with different
- *    surface flags (e.g. two-sided vs. single-sided).
- *
- * * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_UNREAL_HANDLE_FLAGS \
-    "UNREAL_HANDLE_FLAGS"
-
-// ---------------------------------------------------------------------------
-/** @brief Configures the terragen import plugin to compute uv's for
- *  terrains, if not given. Furthermore a default texture is assigned.
- *
- * UV coordinates for terrains are so simple to compute that you'll usually
- * want to compute them on your own, if you need them. This option is intended
- * for model viewers which want to offer an easy way to apply textures to
- * terrains.
- * * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_TER_MAKE_UVS \
-    "IMPORT_TER_MAKE_UVS"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the ASE loader to always reconstruct normal vectors
- *  basing on the smoothing groups loaded from the file.
- *
- * Some ASE files have carry invalid normals, other don't.
- * * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_ASE_RECONSTRUCT_NORMALS    \
-    "IMPORT_ASE_RECONSTRUCT_NORMALS"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the M3D loader to detect and process multi-part
- *    Quake player models.
- *
- * These models usually consist of 3 files, lower.md3, upper.md3 and
- * head.md3. If this property is set to true, Assimp will try to load and
- * combine all three files if one of them is loaded.
- * Property type: bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_MD3_HANDLE_MULTIPART \
-    "IMPORT_MD3_HANDLE_MULTIPART"
-
-// ---------------------------------------------------------------------------
-/** @brief  Tells the MD3 loader which skin files to load.
- *
- * When loading MD3 files, Assimp checks whether a file
- * [md3_file_name]_[skin_name].skin is existing. These files are used by
- * Quake III to be able to assign different skins (e.g. red and blue team)
- * to models. 'default', 'red', 'blue' are typical skin names.
- * Property type: String. Default value: "default".
- */
-#define AI_CONFIG_IMPORT_MD3_SKIN_NAME \
-    "IMPORT_MD3_SKIN_NAME"
-
-// ---------------------------------------------------------------------------
-/** @brief  Specify the Quake 3 shader file to be used for a particular
- *  MD3 file. This can also be a search path.
- *
- * By default Assimp's behaviour is as follows: If a MD3 file
- * <tt>any_path/models/any_q3_subdir/model_name/file_name.md3</tt> is
- * loaded, the library tries to locate the corresponding shader file in
- * <tt>any_path/scripts/model_name.shader</tt>. This property overrides this
- * behaviour. It can either specify a full path to the shader to be loaded
- * or alternatively the path (relative or absolute) to the directory where
- * the shaders for all MD3s to be loaded reside. Assimp attempts to open
- * <tt>IMPORT_MD3_SHADER_SRC/model_name.shader</tt> first, <tt>IMPORT_MD3_SHADER_SRC/file_name.shader</tt>
- * is the fallback file. Note that IMPORT_MD3_SHADER_SRC should have a terminal (back)slash.
- * Property type: String. Default value: n/a.
- */
-#define AI_CONFIG_IMPORT_MD3_SHADER_SRC \
-    "IMPORT_MD3_SHADER_SRC"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the LWO loader to load just one layer from the model.
- *
- * LWO files consist of layers and in some cases it could be useful to load
- * only one of them. This property can be either a string - which specifies
- * the name of the layer - or an integer - the index of the layer. If the
- * property is not set the whole LWO model is loaded. Loading fails if the
- * requested layer is not available. The layer index is zero-based and the
- * layer name may not be empty.<br>
- * Property type: Integer. Default value: all layers are loaded.
- */
-#define AI_CONFIG_IMPORT_LWO_ONE_LAYER_ONLY         \
-    "IMPORT_LWO_ONE_LAYER_ONLY"
-
-// ---------------------------------------------------------------------------
-/** @brief  Configures the MD5 loader to not load the MD5ANIM file for
- *  a MD5MESH file automatically.
- *
- * The default strategy is to look for a file with the same name but the
- * MD5ANIM extension in the same directory. If it is found, it is loaded
- * and combined with the MD5MESH file. This configuration option can be
- * used to disable this behaviour.
- *
- * * Property type: bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_MD5_NO_ANIM_AUTOLOAD           \
-    "IMPORT_MD5_NO_ANIM_AUTOLOAD"
-
-// ---------------------------------------------------------------------------
-/** @brief Defines the begin of the time range for which the LWS loader
- *    evaluates animations and computes aiNodeAnim's.
- *
- * Assimp provides full conversion of LightWave's envelope system, including
- * pre and post conditions. The loader computes linearly subsampled animation
- * chanels with the frame rate given in the LWS file. This property defines
- * the start time. Note: animation channels are only generated if a node
- * has at least one envelope with more tan one key assigned. This property.
- * is given in frames, '0' is the first frame. By default, if this property
- * is not set, the importer takes the animation start from the input LWS
- * file ('FirstFrame' line)<br>
- * Property type: Integer. Default value: taken from file.
- *
- * @see AI_CONFIG_IMPORT_LWS_ANIM_END - end of the imported time range
- */
-#define AI_CONFIG_IMPORT_LWS_ANIM_START         \
-    "IMPORT_LWS_ANIM_START"
-#define AI_CONFIG_IMPORT_LWS_ANIM_END           \
-    "IMPORT_LWS_ANIM_END"
-
-// ---------------------------------------------------------------------------
-/** @brief Defines the output frame rate of the IRR loader.
- *
- * IRR animations are difficult to convert for Assimp and there will
- * always be a loss of quality. This setting defines how many keys per second
- * are returned by the converter.<br>
- * Property type: integer. Default value: 100
- */
-#define AI_CONFIG_IMPORT_IRR_ANIM_FPS               \
-    "IMPORT_IRR_ANIM_FPS"
-
-// ---------------------------------------------------------------------------
-/** @brief Ogre Importer will try to find referenced materials from this file.
- *
- * Ogre meshes reference with material names, this does not tell Assimp the file
- * where it is located in. Assimp will try to find the source file in the following
- * order: <material-name>.material, <mesh-filename-base>.material and
- * lastly the material name defined by this config property.
- * <br>
- * Property type: String. Default value: Scene.material.
- */
-#define AI_CONFIG_IMPORT_OGRE_MATERIAL_FILE \
-    "IMPORT_OGRE_MATERIAL_FILE"
-
-// ---------------------------------------------------------------------------
-/** @brief Ogre Importer detect the texture usage from its filename.
- *
- * Ogre material texture units do not define texture type, the textures usage
- * depends on the used shader or Ogre's fixed pipeline. If this config property
- * is true Assimp will try to detect the type from the textures filename postfix:
- * _n, _nrm, _nrml, _normal, _normals and _normalmap for normal map, _s, _spec,
- * _specular and _specularmap for specular map, _l, _light, _lightmap, _occ
- * and _occlusion for light map, _disp and _displacement for displacement map.
- * The matching is case insensitive. Post fix is taken between the last
- * underscore and the last period.
- * Default behavior is to detect type from lower cased texture unit name by
- * matching against: normalmap, specularmap, lightmap and displacementmap.
- * For both cases if no match is found aiTextureType_DIFFUSE is used.
- * <br>
- * Property type: Bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_OGRE_TEXTURETYPE_FROM_FILENAME \
-    "IMPORT_OGRE_TEXTURETYPE_FROM_FILENAME"
-
- /** @brief Specifies whether the Android JNI asset extraction is supported.
-  *
-  * Turn on this option if you want to manage assets in native
-  * Android application without having to keep the internal directory and asset
-  * manager pointer.
-  */
- #define AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT "AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the IFC loader skips over IfcSpace elements.
- *
- * IfcSpace elements (and their geometric representations) are used to
- * represent, well, free space in a building storey.<br>
- * Property type: Bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS "IMPORT_IFC_SKIP_SPACE_REPRESENTATIONS"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the IFC loader will use its own, custom triangulation
- *   algorithm to triangulate wall and floor meshes.
- *
- * If this property is set to false, walls will be either triangulated by
- * #aiProcess_Triangulate or will be passed through as huge polygons with
- * faked holes (i.e. holes that are connected with the outer boundary using
- * a dummy edge). It is highly recommended to set this property to true
- * if you want triangulated data because #aiProcess_Triangulate is known to
- * have problems with the kind of polygons that the IFC loader spits out for
- * complicated meshes.
- * Property type: Bool. Default value: true.
- */
-#define AI_CONFIG_IMPORT_IFC_CUSTOM_TRIANGULATION "IMPORT_IFC_CUSTOM_TRIANGULATION"
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the tessellation conic angle for IFC smoothing curves.
- *
- * This is used by the IFC importer to determine the tessellation parameter
- * for smoothing curves.
- * @note The default value is AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE and the
- * accepted values are in range [5.0, 120.0].
- * Property type: Float.
- */
-#define AI_CONFIG_IMPORT_IFC_SMOOTHING_ANGLE "IMPORT_IFC_SMOOTHING_ANGLE"
-
-// default value for AI_CONFIG_IMPORT_IFC_SMOOTHING_ANGLE
-#if (!defined AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE)
-#   define AI_IMPORT_IFC_DEFAULT_SMOOTHING_ANGLE 10.0f
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief  Set the tessellation for IFC cylindrical shapes.
- *
- * This is used by the IFC importer to determine the tessellation parameter
- * for cylindrical shapes, i.e. the number of segments used to approximate a circle.
- * @note The default value is AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION and the
- * accepted values are in range [3, 180].
- * Property type: Integer.
- */
-#define AI_CONFIG_IMPORT_IFC_CYLINDRICAL_TESSELLATION "IMPORT_IFC_CYLINDRICAL_TESSELLATION"
-
-// default value for AI_CONFIG_IMPORT_IFC_CYLINDRICAL_TESSELLATION
-#if (!defined AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION)
-#   define AI_IMPORT_IFC_DEFAULT_CYLINDRICAL_TESSELLATION 32
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the Collada loader will ignore the provided up direction.
- *
- * If this property is set to true, the up direction provided in the file header will
- * be ignored and the file will be loaded as is.
- * Property type: Bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_COLLADA_IGNORE_UP_DIRECTION "IMPORT_COLLADA_IGNORE_UP_DIRECTION"
-
-// ---------------------------------------------------------------------------
-/** @brief Specifies whether the Collada loader should use Collada names as node names.
- *
- * If this property is set to true, the Collada names will be used as the
- * node name. The default is to use the id tag (resp. sid tag, if no id tag is present)
- * instead.
- * Property type: Bool. Default value: false.
- */
-#define AI_CONFIG_IMPORT_COLLADA_USE_COLLADA_NAMES "IMPORT_COLLADA_USE_COLLADA_NAMES"
-
-// ---------- All the Export defines ------------
-
-/** @brief Specifies the xfile use double for real values of float
- *
- * Property type: Bool. Default value: false.
- */
-
-#define AI_CONFIG_EXPORT_XFILE_64BIT "EXPORT_XFILE_64BIT"
-
-/** @brief Specifies whether the assimp export shall be able to export point clouds
- * 
- *  When this flag is not defined the render data has to contain valid faces.
- *  Point clouds are only a collection of vertices which have nor spatial organization
- *  by a face and the validation process will remove them. Enabling this feature will
- *  switch off the flag and enable the functionality to export pure point clouds.
- */
-#define AI_CONFIG_EXPORT_POINT_CLOUDS "EXPORT_POINT_CLOUDS"
-
-/**
- *  @brief  Specifies a gobal key factor for scale, float value
- */
-#define AI_CONFIG_GLOBAL_SCALE_FACTOR_KEY "GLOBAL_SCALE_FACTOR"
-
-#if (!defined AI_CONFIG_GLOBAL_SCALE_FACTOR_DEFAULT)
-#   define AI_CONFIG_GLOBAL_SCALE_FACTOR_DEFAULT  1.0f
-#endif // !! AI_DEBONE_THRESHOLD
-
-#define AI_CONFIG_APP_SCALE_KEY "APP_SCALE_FACTOR"
-
-#if (!defined AI_CONFIG_APP_SCALE_KEY)
-#   define AI_CONFIG_APP_SCALE_KEY 1.0
-#endif // AI_CONFIG_APP_SCALE_KEY
-
-
-// ---------- All the Build/Compile-time defines ------------
-
-/** @brief Specifies if double precision is supported inside assimp
- *
- * Property type: Bool. Default value: undefined.
- */
-
-#cmakedefine ASSIMP_DOUBLE_PRECISION 1
-
-#endif // !! AI_CONFIG_H_INC
diff --git a/thirdparty/assimp/include/assimp/defs.h b/thirdparty/assimp/include/assimp/defs.h
deleted file mode 100644
index 6f2f8ae88b..0000000000
--- a/thirdparty/assimp/include/assimp/defs.h
+++ /dev/null
@@ -1,327 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file defs.h
- *  @brief Assimp build configuration setup. See the notes in the comment
- *  blocks to find out how to customize _your_ Assimp build.
- */
-
-#pragma once
-#ifndef AI_DEFINES_H_INC
-#define AI_DEFINES_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/config.h>
-
-//////////////////////////////////////////////////////////////////////////
-/* Define ASSIMP_BUILD_NO_XX_IMPORTER to disable a specific
- * file format loader. The loader is be excluded from the
- * build in this case. 'XX' stands for the most common file
- * extension of the file format. E.g.:
- * ASSIMP_BUILD_NO_X_IMPORTER disables the X loader.
- *
- * If you're unsure about that, take a look at the implementation of the
- * import plugin you wish to disable. You'll find the right define in the
- * first lines of the corresponding unit.
- *
- * Other (mixed) configuration switches are listed here:
- *    ASSIMP_BUILD_NO_COMPRESSED_X
- *      - Disable support for compressed X files (zip)
- *    ASSIMP_BUILD_NO_COMPRESSED_BLEND
- *      - Disable support for compressed Blender files (zip)
- *    ASSIMP_BUILD_NO_COMPRESSED_IFC
- *      - Disable support for IFCZIP files (unzip)
- */
-//////////////////////////////////////////////////////////////////////////
-
-#ifndef ASSIMP_BUILD_NO_COMPRESSED_X
-#   define ASSIMP_BUILD_NEED_Z_INFLATE
-#endif
-
-#ifndef ASSIMP_BUILD_NO_COMPRESSED_BLEND
-#   define ASSIMP_BUILD_NEED_Z_INFLATE
-#endif
-
-#ifndef ASSIMP_BUILD_NO_COMPRESSED_IFC
-#   define ASSIMP_BUILD_NEED_Z_INFLATE
-#   define ASSIMP_BUILD_NEED_UNZIP
-#endif
-
-#ifndef ASSIMP_BUILD_NO_Q3BSP_IMPORTER
-#   define ASSIMP_BUILD_NEED_Z_INFLATE
-#   define ASSIMP_BUILD_NEED_UNZIP
-#endif
-
-//////////////////////////////////////////////////////////////////////////
-/* Define ASSIMP_BUILD_NO_XX_PROCESS to disable a specific
- * post processing step. This is the current list of process names ('XX'):
- * CALCTANGENTS
- * JOINVERTICES
- * TRIANGULATE
- * DROPFACENORMALS
- * GENFACENORMALS
- * GENVERTEXNORMALS
- * REMOVEVC
- * SPLITLARGEMESHES
- * PRETRANSFORMVERTICES
- * LIMITBONEWEIGHTS
- * VALIDATEDS
- * IMPROVECACHELOCALITY
- * FIXINFACINGNORMALS
- * REMOVE_REDUNDANTMATERIALS
- * OPTIMIZEGRAPH
- * SORTBYPTYPE
- * FINDINVALIDDATA
- * TRANSFORMTEXCOORDS
- * GENUVCOORDS
- * ENTITYMESHBUILDER
- * EMBEDTEXTURES
- * MAKELEFTHANDED
- * FLIPUVS
- * FLIPWINDINGORDER
- * OPTIMIZEMESHES
- * OPTIMIZEANIMS
- * OPTIMIZEGRAPH
- * GENENTITYMESHES
- * FIXTEXTUREPATHS
- * GENBOUNDINGBOXES */
-//////////////////////////////////////////////////////////////////////////
-
-#ifdef _WIN32
-#   undef ASSIMP_API
-    //////////////////////////////////////////////////////////////////////////
-    /* Define 'ASSIMP_BUILD_DLL_EXPORT' to build a DLL of the library */
-    //////////////////////////////////////////////////////////////////////////
-#   ifdef ASSIMP_BUILD_DLL_EXPORT
-#       define ASSIMP_API __declspec(dllexport)
-#       define ASSIMP_API_WINONLY __declspec(dllexport)
-
-    //////////////////////////////////////////////////////////////////////////
-    /* Define 'ASSIMP_DLL' before including Assimp to link to ASSIMP in
-     * an external DLL under Windows. Default is static linkage. */
-    //////////////////////////////////////////////////////////////////////////
-#   elif (defined ASSIMP_DLL)
-#       define ASSIMP_API __declspec(dllimport)
-#       define ASSIMP_API_WINONLY __declspec(dllimport)
-#   else
-#       define ASSIMP_API
-#       define ASSIMP_API_WINONLY
-#   endif
-#elif defined(SWIG)
-
-    /* Do nothing, the relevant defines are all in AssimpSwigPort.i */
-
-#else
-#   define ASSIMP_API __attribute__ ((visibility("default")))
-#   define ASSIMP_API_WINONLY
-#endif
-
-#ifdef _MSC_VER
-#   ifdef ASSIMP_BUILD_DLL_EXPORT
-#       pragma warning (disable : 4251)
-#   endif
-    /* Force the compiler to inline a function, if possible
-     */
-#   define AI_FORCE_INLINE __forceinline
-
-    /* Tells the compiler that a function never returns. Used in code analysis
-     * to skip dead paths (e.g. after an assertion evaluated to false). */
-#   define AI_WONT_RETURN __declspec(noreturn)
-#elif defined(SWIG)
-
-    /* Do nothing, the relevant defines are all in AssimpSwigPort.i */
-
-#else
-#   define AI_WONT_RETURN
-#   define AI_FORCE_INLINE inline
-#endif // (defined _MSC_VER)
-
-#ifdef __GNUC__
-#   define AI_WONT_RETURN_SUFFIX  __attribute__((noreturn))
-#else
-#   define AI_WONT_RETURN_SUFFIX
-#endif // (defined __clang__)
-
-#ifdef __cplusplus
-    /* No explicit 'struct' and 'enum' tags for C++, this keeps showing up
-     * in doxydocs.
-     */
-#   define C_STRUCT
-#   define C_ENUM
-#else
-    //////////////////////////////////////////////////////////////////////////
-    /* To build the documentation, make sure ASSIMP_DOXYGEN_BUILD
-     * is defined by Doxygen's preprocessor. The corresponding
-     * entries in the DOXYFILE are: */
-    //////////////////////////////////////////////////////////////////////////
-#if 0
-    ENABLE_PREPROCESSING   = YES
-    MACRO_EXPANSION        = YES
-    EXPAND_ONLY_PREDEF     = YES
-    SEARCH_INCLUDES        = YES
-    INCLUDE_PATH           =
-    INCLUDE_FILE_PATTERNS  =
-    PREDEFINED             = ASSIMP_DOXYGEN_BUILD=1
-    EXPAND_AS_DEFINED      = C_STRUCT C_ENUM
-    SKIP_FUNCTION_MACROS   = YES
-#endif
-    //////////////////////////////////////////////////////////////////////////
-    /* Doxygen gets confused if we use c-struct typedefs to avoid
-     * the explicit 'struct' notation. This trick here has the same
-     * effect as the TYPEDEF_HIDES_STRUCT option, but we don't need
-     * to typedef all structs/enums. */
-     //////////////////////////////////////////////////////////////////////////
-#   if (defined ASSIMP_DOXYGEN_BUILD)
-#       define C_STRUCT
-#       define C_ENUM
-#   else
-#       define C_STRUCT struct
-#       define C_ENUM   enum
-#   endif
-#endif
-
-#if (defined(__BORLANDC__) || defined (__BCPLUSPLUS__))
-#   error Currently, Borland is unsupported. Feel free to port Assimp.
-#endif
-
-
-    //////////////////////////////////////////////////////////////////////////
-    /* Define ASSIMP_BUILD_SINGLETHREADED to compile assimp
-     * without threading support. The library doesn't utilize
-     * threads then and is itself not threadsafe. */
-    //////////////////////////////////////////////////////////////////////////
-#ifndef ASSIMP_BUILD_SINGLETHREADED
-#   define ASSIMP_BUILD_SINGLETHREADED
-#endif
-
-#if defined(_DEBUG) || ! defined(NDEBUG)
-#   define ASSIMP_BUILD_DEBUG
-#endif
-
-    //////////////////////////////////////////////////////////////////////////
-    /* Define ASSIMP_DOUBLE_PRECISION to compile assimp
-     * with double precision support (64-bit). */
-    //////////////////////////////////////////////////////////////////////////
-
-#ifdef ASSIMP_DOUBLE_PRECISION
-    typedef double ai_real;
-    typedef signed long long int ai_int;
-    typedef unsigned long long int ai_uint;
-#ifndef ASSIMP_AI_REAL_TEXT_PRECISION
-#define ASSIMP_AI_REAL_TEXT_PRECISION 16
-#endif // ASSIMP_AI_REAL_TEXT_PRECISION
-#else // ASSIMP_DOUBLE_PRECISION
-    typedef float ai_real;
-    typedef signed int ai_int;
-    typedef unsigned int ai_uint;
-#ifndef ASSIMP_AI_REAL_TEXT_PRECISION
-#define ASSIMP_AI_REAL_TEXT_PRECISION 8
-#endif // ASSIMP_AI_REAL_TEXT_PRECISION
-#endif // ASSIMP_DOUBLE_PRECISION
-
-    //////////////////////////////////////////////////////////////////////////
-    /* Useful constants */
-    //////////////////////////////////////////////////////////////////////////
-
-/* This is PI. Hi PI. */
-#define AI_MATH_PI          (3.141592653589793238462643383279 )
-#define AI_MATH_TWO_PI      (AI_MATH_PI * 2.0)
-#define AI_MATH_HALF_PI     (AI_MATH_PI * 0.5)
-
-/* And this is to avoid endless casts to float */
-#define AI_MATH_PI_F        (3.1415926538f)
-#define AI_MATH_TWO_PI_F    (AI_MATH_PI_F * 2.0f)
-#define AI_MATH_HALF_PI_F   (AI_MATH_PI_F * 0.5f)
-
-/* Tiny macro to convert from radians to degrees and back */
-#define AI_DEG_TO_RAD(x) ((x)*(ai_real)0.0174532925)
-#define AI_RAD_TO_DEG(x) ((x)*(ai_real)57.2957795)
-
-/* Numerical limits */
-static const ai_real ai_epsilon = (ai_real) 0.00001;
-
-/* Support for big-endian builds */
-#if defined(__BYTE_ORDER__)
-#   if (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__)
-#       if !defined(__BIG_ENDIAN__)
-#           define __BIG_ENDIAN__
-#       endif
-#   else /* little endian */
-#       if defined (__BIG_ENDIAN__)
-#           undef __BIG_ENDIAN__
-#       endif
-#   endif
-#endif
-#if defined(__BIG_ENDIAN__)
-#   define AI_BUILD_BIG_ENDIAN
-#endif
-
-
-/**
- *  To avoid running out of memory
- *  This can be adjusted for specific use cases
- *  It's NOT a total limit, just a limit for individual allocations
- */
-#define AI_MAX_ALLOC(type) ((256U * 1024 * 1024) / sizeof(type))
-
-#ifndef _MSC_VER
-#  define AI_NO_EXCEPT noexcept
-#else
-#  if (_MSC_VER >= 1915 )
-#    define AI_NO_EXCEPT noexcept
-#  else
-#    define AI_NO_EXCEPT
-#  endif
-#endif // _MSC_VER
-
-/**
- *  Helper macro to set a pointer to NULL in debug builds
- */
-#if (defined ASSIMP_BUILD_DEBUG)
-#   define AI_DEBUG_INVALIDATE_PTR(x) x = NULL;
-#else
-#   define AI_DEBUG_INVALIDATE_PTR(x)
-#endif
-
-#endif // !! AI_DEFINES_H_INC
diff --git a/thirdparty/assimp/include/assimp/fast_atof.h b/thirdparty/assimp/include/assimp/fast_atof.h
deleted file mode 100644
index 6e9a1bba7a..0000000000
--- a/thirdparty/assimp/include/assimp/fast_atof.h
+++ /dev/null
@@ -1,377 +0,0 @@
-#pragma once
-
-// Copyright (C) 2002-2007 Nikolaus Gebhardt
-// This file is part of the "Irrlicht Engine" and the "irrXML" project.
-// For conditions of distribution and use, see copyright notice in irrlicht.h and irrXML.h
-
-// ------------------------------------------------------------------------------------
-// Original description: (Schrompf)
-// Adapted to the ASSIMP library because the builtin atof indeed takes AGES to parse a
-// float inside a large string. Before parsing, it does a strlen on the given point.
-// Changes:
-//  22nd October 08 (Aramis_acg): Added temporary cast to double, added strtoul10_64
-//     to ensure long numbers are handled correctly
-// ------------------------------------------------------------------------------------
-
-#pragma once
-#ifndef FAST_A_TO_F_H_INCLUDED
-#define FAST_A_TO_F_H_INCLUDED
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <cmath>
-#include <limits>
-#include <stdint.h>
-#include <stdexcept>
-#include <assimp/defs.h>
-
-#include "StringComparison.h"
-#include <assimp/DefaultLogger.hpp>
-
-#ifdef _MSC_VER
-#  include <stdint.h>
-#else
-#  include <assimp/Compiler/pstdint.h>
-#endif
-
-namespace Assimp {
-
-const double fast_atof_table[16] =  {  // we write [16] here instead of [] to work around a swig bug
-    0.0,
-    0.1,
-    0.01,
-    0.001,
-    0.0001,
-    0.00001,
-    0.000001,
-    0.0000001,
-    0.00000001,
-    0.000000001,
-    0.0000000001,
-    0.00000000001,
-    0.000000000001,
-    0.0000000000001,
-    0.00000000000001,
-    0.000000000000001
-};
-
-
-// ------------------------------------------------------------------------------------
-// Convert a string in decimal format to a number
-// ------------------------------------------------------------------------------------
-inline
-unsigned int strtoul10( const char* in, const char** out=0) {
-    unsigned int value = 0;
-
-    for ( ;; ) {
-        if ( *in < '0' || *in > '9' ) {
-            break;
-        }
-
-        value = ( value * 10 ) + ( *in - '0' );
-        ++in;
-    }
-    if ( out ) {
-        *out = in;
-    }
-    return value;
-}
-
-// ------------------------------------------------------------------------------------
-// Convert a string in octal format to a number
-// ------------------------------------------------------------------------------------
-inline
-unsigned int strtoul8( const char* in, const char** out=0) {
-    unsigned int value( 0 );
-    for ( ;; ) {
-        if ( *in < '0' || *in > '7' ) {
-            break;
-        }
-
-        value = ( value << 3 ) + ( *in - '0' );
-        ++in;
-    }
-    if ( out ) {
-        *out = in;
-    }
-    return value;
-}
-
-// ------------------------------------------------------------------------------------
-// Convert a string in hex format to a number
-// ------------------------------------------------------------------------------------
-inline
-unsigned int strtoul16( const char* in, const char** out=0) {
-    unsigned int value( 0 );
-    for ( ;; ) {
-        if ( *in >= '0' && *in <= '9' ) {
-            value = ( value << 4u ) + ( *in - '0' );
-        } else if (*in >= 'A' && *in <= 'F') {
-            value = ( value << 4u ) + ( *in - 'A' ) + 10;
-        } else if (*in >= 'a' && *in <= 'f') {
-            value = ( value << 4u ) + ( *in - 'a' ) + 10;
-        } else {
-            break;
-        }
-        ++in;
-    }
-    if ( out ) {
-        *out = in;
-    }
-    return value;
-}
-
-// ------------------------------------------------------------------------------------
-// Convert just one hex digit
-// Return value is UINT_MAX if the input character is not a hex digit.
-// ------------------------------------------------------------------------------------
-inline
-unsigned int HexDigitToDecimal(char in) {
-    unsigned int out( UINT_MAX );
-    if ( in >= '0' && in <= '9' ) {
-        out = in - '0';
-    } else if ( in >= 'a' && in <= 'f' ) {
-        out = 10u + in - 'a';
-    } else if ( in >= 'A' && in <= 'F' ) {
-        out = 10u + in - 'A';
-    }
-
-    // return value is UINT_MAX if the input is not a hex digit
-    return out;
-}
-
-// ------------------------------------------------------------------------------------
-// Convert a hex-encoded octet (2 characters, i.e. df or 1a).
-// ------------------------------------------------------------------------------------
-inline
-uint8_t HexOctetToDecimal(const char* in) {
-    return ((uint8_t)HexDigitToDecimal(in[0])<<4)+(uint8_t)HexDigitToDecimal(in[1]);
-}
-
-// ------------------------------------------------------------------------------------
-// signed variant of strtoul10
-// ------------------------------------------------------------------------------------
-inline
-int strtol10( const char* in, const char** out=0) {
-    bool inv = (*in=='-');
-    if ( inv || *in == '+' ) {
-        ++in;
-    }
-
-    int value = strtoul10(in,out);
-    if (inv) {
-        value = -value;
-    }
-    return value;
-}
-
-// ------------------------------------------------------------------------------------
-// Parse a C++-like integer literal - hex and oct prefixes.
-// 0xNNNN - hex
-// 0NNN   - oct
-// NNN    - dec
-// ------------------------------------------------------------------------------------
-inline
-unsigned int strtoul_cppstyle( const char* in, const char** out=0) {
-    if ('0' == in[0]) {
-        return 'x' == in[1] ? strtoul16(in+2,out) : strtoul8(in+1,out);
-    }
-    return strtoul10(in, out);
-}
-
-// ------------------------------------------------------------------------------------
-// Special version of the function, providing higher accuracy and safety
-// It is mainly used by fast_atof to prevent ugly and unwanted integer overflows.
-// ------------------------------------------------------------------------------------
-inline
-uint64_t strtoul10_64( const char* in, const char** out=0, unsigned int* max_inout=0) {
-    unsigned int cur = 0;
-    uint64_t value = 0;
-
-    if ( *in < '0' || *in > '9' ) {
-        throw std::invalid_argument( std::string( "The string \"" ) + in + "\" cannot be converted into a value." );
-    }
-
-    for ( ;; ) {
-        if ( *in < '0' || *in > '9' ) {
-            break;
-        }
-
-        const uint64_t new_value = ( value * (uint64_t) 10 ) + ( (uint64_t) ( *in - '0' ) );
-
-        // numeric overflow, we rely on you
-        if ( new_value < value ) {
-            ASSIMP_LOG_WARN_F( "Converting the string \"", in, "\" into a value resulted in overflow." );
-            return 0;
-        }
-
-        value = new_value;
-
-        ++in;
-        ++cur;
-
-        if (max_inout && *max_inout == cur) {
-            if (out) { /* skip to end */
-                while ( *in >= '0' && *in <= '9' ) {
-                    ++in;
-                }
-                *out = in;
-            }
-
-            return value;
-        }
-    }
-    if ( out ) {
-        *out = in;
-    }
-
-    if ( max_inout ) {
-        *max_inout = cur;
-    }
-
-    return value;
-}
-
-// ------------------------------------------------------------------------------------
-// signed variant of strtoul10_64
-// ------------------------------------------------------------------------------------
-inline
-int64_t strtol10_64(const char* in, const char** out = 0, unsigned int* max_inout = 0) {
-    bool inv = (*in == '-');
-    if ( inv || *in == '+' ) {
-        ++in;
-    }
-
-    int64_t value = strtoul10_64(in, out, max_inout);
-    if (inv) {
-        value = -value;
-    }
-    return value;
-}
-
-// Number of relevant decimals for floating-point parsing.
-#define AI_FAST_ATOF_RELAVANT_DECIMALS 15
-
-// ------------------------------------------------------------------------------------
-//! Provides a fast function for converting a string into a float,
-//! about 6 times faster than atof in win32.
-// If you find any bugs, please send them to me, niko (at) irrlicht3d.org.
-// ------------------------------------------------------------------------------------
-template<typename Real>
-inline
-const char* fast_atoreal_move(const char* c, Real& out, bool check_comma = true) {
-    Real f = 0;
-
-    bool inv = (*c == '-');
-    if (inv || *c == '+') {
-        ++c;
-    }
-
-    if ((c[0] == 'N' || c[0] == 'n') && ASSIMP_strincmp(c, "nan", 3) == 0) {
-        out = std::numeric_limits<Real>::quiet_NaN();
-        c += 3;
-        return c;
-    }
-
-    if ((c[0] == 'I' || c[0] == 'i') && ASSIMP_strincmp(c, "inf", 3) == 0) {
-        out = std::numeric_limits<Real>::infinity();
-        if (inv) {
-            out = -out;
-        }
-        c += 3;
-        if ((c[0] == 'I' || c[0] == 'i') && ASSIMP_strincmp(c, "inity", 5) == 0) {
-            c += 5;
-        }
-        return c;
-     }
-
-    if (!(c[0] >= '0' && c[0] <= '9') &&
-            !((c[0] == '.' || (check_comma && c[0] == ',')) && c[1] >= '0' && c[1] <= '9')) {
-        throw std::invalid_argument("Cannot parse string "
-                                    "as real number: does not start with digit "
-                                    "or decimal point followed by digit.");
-    }
-
-    if (*c != '.' && (! check_comma || c[0] != ',')) {
-        f = static_cast<Real>( strtoul10_64 ( c, &c) );
-    }
-
-    if ((*c == '.' || (check_comma && c[0] == ',')) && c[1] >= '0' && c[1] <= '9') {
-        ++c;
-
-        // NOTE: The original implementation is highly inaccurate here. The precision of a single
-        // IEEE 754 float is not high enough, everything behind the 6th digit tends to be more
-        // inaccurate than it would need to be. Casting to double seems to solve the problem.
-        // strtol_64 is used to prevent integer overflow.
-
-        // Another fix: this tends to become 0 for long numbers if we don't limit the maximum
-        // number of digits to be read. AI_FAST_ATOF_RELAVANT_DECIMALS can be a value between
-        // 1 and 15.
-        unsigned int diff = AI_FAST_ATOF_RELAVANT_DECIMALS;
-        double pl = static_cast<double>( strtoul10_64 ( c, &c, &diff ));
-
-        pl *= fast_atof_table[diff];
-        f += static_cast<Real>( pl );
-    }
-    // For backwards compatibility: eat trailing dots, but not trailing commas.
-    else if (*c == '.') {
-        ++c;
-    }
-
-    // A major 'E' must be allowed. Necessary for proper reading of some DXF files.
-    // Thanks to Zhao Lei to point out that this if() must be outside the if (*c == '.' ..)
-    if (*c == 'e' || *c == 'E') {
-        ++c;
-        const bool einv = (*c=='-');
-        if (einv || *c=='+') {
-            ++c;
-        }
-
-        // The reason float constants are used here is that we've seen cases where compilers
-        // would perform such casts on compile-time constants at runtime, which would be
-        // bad considering how frequently fast_atoreal_move<float> is called in Assimp.
-        Real exp = static_cast<Real>( strtoul10_64(c, &c) );
-        if (einv) {
-            exp = -exp;
-        }
-        f *= std::pow(static_cast<Real>(10.0), exp);
-    }
-
-    if (inv) {
-        f = -f;
-    }
-    out = f;
-    return c;
-}
-
-// ------------------------------------------------------------------------------------
-// The same but more human.
-inline
-ai_real fast_atof(const char* c) {
-    ai_real ret(0.0);
-    fast_atoreal_move<ai_real>(c, ret);
-
-    return ret;
-}
-
-inline
-ai_real fast_atof( const char* c, const char** cout) {
-    ai_real ret(0.0);
-    *cout = fast_atoreal_move<ai_real>(c, ret);
-
-    return ret;
-}
-
-inline
-ai_real fast_atof( const char** inout) {
-    ai_real ret(0.0);
-    *inout = fast_atoreal_move<ai_real>(*inout, ret);
-
-    return ret;
-}
-
-} //! namespace Assimp
-
-#endif // FAST_A_TO_F_H_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/importerdesc.h b/thirdparty/assimp/include/assimp/importerdesc.h
deleted file mode 100644
index 0a6919c1ae..0000000000
--- a/thirdparty/assimp/include/assimp/importerdesc.h
+++ /dev/null
@@ -1,148 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file importerdesc.h
- *  @brief #aiImporterFlags, aiImporterDesc implementation.
- */
-#pragma once
-#ifndef AI_IMPORTER_DESC_H_INC
-#define AI_IMPORTER_DESC_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-
-/** Mixed set of flags for #aiImporterDesc, indicating some features
-  *  common to many importers*/
-enum aiImporterFlags {
-    /** Indicates that there is a textual encoding of the
-     *  file format; and that it is supported.*/
-    aiImporterFlags_SupportTextFlavour = 0x1,
-
-    /** Indicates that there is a binary encoding of the
-     *  file format; and that it is supported.*/
-    aiImporterFlags_SupportBinaryFlavour = 0x2,
-
-    /** Indicates that there is a compressed encoding of the
-     *  file format; and that it is supported.*/
-    aiImporterFlags_SupportCompressedFlavour = 0x4,
-
-    /** Indicates that the importer reads only a very particular
-      * subset of the file format. This happens commonly for
-      * declarative or procedural formats which cannot easily
-      * be mapped to #aiScene */
-    aiImporterFlags_LimitedSupport = 0x8,
-
-    /** Indicates that the importer is highly experimental and
-      * should be used with care. This only happens for trunk
-      * (i.e. SVN) versions, experimental code is not included
-      * in releases. */
-    aiImporterFlags_Experimental = 0x10
-};
-
-
-/** Meta information about a particular importer. Importers need to fill
- *  this structure, but they can freely decide how talkative they are.
- *  A common use case for loader meta info is a user interface
- *  in which the user can choose between various import/export file
- *  formats. Building such an UI by hand means a lot of maintenance
- *  as importers/exporters are added to Assimp, so it might be useful
- *  to have a common mechanism to query some rough importer
- *  characteristics. */
-struct aiImporterDesc {
-    /** Full name of the importer (i.e. Blender3D importer)*/
-    const char* mName;
-
-    /** Original author (left blank if unknown or whole assimp team) */
-    const char* mAuthor;
-
-    /** Current maintainer, left blank if the author maintains */
-    const char* mMaintainer;
-
-    /** Implementation comments, i.e. unimplemented features*/
-    const char* mComments;
-
-    /** These flags indicate some characteristics common to many
-        importers. */
-    unsigned int mFlags;
-
-    /** Minimum format version that can be loaded im major.minor format,
-        both are set to 0 if there is either no version scheme
-        or if the loader doesn't care. */
-    unsigned int mMinMajor;
-    unsigned int mMinMinor;
-
-    /** Maximum format version that can be loaded im major.minor format,
-        both are set to 0 if there is either no version scheme
-        or if the loader doesn't care. Loaders that expect to be
-        forward-compatible to potential future format versions should
-        indicate  zero, otherwise they should specify the current
-        maximum version.*/
-    unsigned int mMaxMajor;
-    unsigned int mMaxMinor;
-
-    /** List of file extensions this importer can handle.
-        List entries are separated by space characters.
-        All entries are lower case without a leading dot (i.e.
-        "xml dae" would be a valid value. Note that multiple
-        importers may respond to the same file extension -
-        assimp calls all importers in the order in which they
-        are registered and each importer gets the opportunity
-        to load the file until one importer "claims" the file. Apart
-        from file extension checks, importers typically use
-        other methods to quickly reject files (i.e. magic
-        words) so this does not mean that common or generic
-        file extensions such as XML would be tediously slow. */
-    const char* mFileExtensions;
-};
-
-/** \brief  Returns the Importer description for a given extension.
-
-Will return a NULL-pointer if no assigned importer desc. was found for the given extension
-    \param  extension   [in] The extension to look for
-    \return A pointer showing to the ImporterDesc, \see aiImporterDesc.
-*/
-ASSIMP_API const C_STRUCT aiImporterDesc* aiGetImporterDesc( const char *extension );
-
-#endif // AI_IMPORTER_DESC_H_INC
diff --git a/thirdparty/assimp/include/assimp/light.h b/thirdparty/assimp/include/assimp/light.h
deleted file mode 100644
index bdb2368c4f..0000000000
--- a/thirdparty/assimp/include/assimp/light.h
+++ /dev/null
@@ -1,263 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file light.h
- *  @brief Defines the aiLight data structure
- */
-
-#pragma once
-#ifndef AI_LIGHT_H_INC
-#define AI_LIGHT_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-/** Enumerates all supported types of light sources.
- */
-enum aiLightSourceType
-{
-    aiLightSource_UNDEFINED     = 0x0,
-
-    //! A directional light source has a well-defined direction
-    //! but is infinitely far away. That's quite a good
-    //! approximation for sun light.
-    aiLightSource_DIRECTIONAL   = 0x1,
-
-    //! A point light source has a well-defined position
-    //! in space but no direction - it emits light in all
-    //! directions. A normal bulb is a point light.
-    aiLightSource_POINT         = 0x2,
-
-    //! A spot light source emits light in a specific
-    //! angle. It has a position and a direction it is pointing to.
-    //! A good example for a spot light is a light spot in
-    //! sport arenas.
-    aiLightSource_SPOT          = 0x3,
-
-    //! The generic light level of the world, including the bounces
-    //! of all other light sources.
-    //! Typically, there's at most one ambient light in a scene.
-    //! This light type doesn't have a valid position, direction, or
-    //! other properties, just a color.
-    aiLightSource_AMBIENT       = 0x4,
-
-    //! An area light is a rectangle with predefined size that uniformly
-    //! emits light from one of its sides. The position is center of the
-    //! rectangle and direction is its normal vector.
-    aiLightSource_AREA          = 0x5,
-
-    /** This value is not used. It is just there to force the
-     *  compiler to map this enum to a 32 Bit integer.
-     */
-#ifndef SWIG
-    _aiLightSource_Force32Bit = INT_MAX
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** Helper structure to describe a light source.
- *
- *  Assimp supports multiple sorts of light sources, including
- *  directional, point and spot lights. All of them are defined with just
- *  a single structure and distinguished by their parameters.
- *  Note - some file formats (such as 3DS, ASE) export a "target point" -
- *  the point a spot light is looking at (it can even be animated). Assimp
- *  writes the target point as a subnode of a spotlights's main node,
- *  called "<spotName>.Target". However, this is just additional information
- *  then, the transformation tracks of the main node make the
- *  spot light already point in the right direction.
-*/
-struct aiLight
-{
-    /** The name of the light source.
-     *
-     *  There must be a node in the scenegraph with the same name.
-     *  This node specifies the position of the light in the scene
-     *  hierarchy and can be animated.
-     */
-    C_STRUCT aiString mName;
-
-    /** The type of the light source.
-     *
-     * aiLightSource_UNDEFINED is not a valid value for this member.
-     */
-    C_ENUM aiLightSourceType mType;
-
-    /** Position of the light source in space. Relative to the
-     *  transformation of the node corresponding to the light.
-     *
-     *  The position is undefined for directional lights.
-     */
-    C_STRUCT aiVector3D mPosition;
-
-    /** Direction of the light source in space. Relative to the
-     *  transformation of the node corresponding to the light.
-     *
-     *  The direction is undefined for point lights. The vector
-     *  may be normalized, but it needn't.
-     */
-    C_STRUCT aiVector3D mDirection;
-
-    /** Up direction of the light source in space. Relative to the
-     *  transformation of the node corresponding to the light.
-     *
-     *  The direction is undefined for point lights. The vector
-     *  may be normalized, but it needn't.
-     */
-    C_STRUCT aiVector3D mUp;
-
-    /** Constant light attenuation factor.
-     *
-     *  The intensity of the light source at a given distance 'd' from
-     *  the light's position is
-     *  @code
-     *  Atten = 1/( att0 + att1 * d + att2 * d*d)
-     *  @endcode
-     *  This member corresponds to the att0 variable in the equation.
-     *  Naturally undefined for directional lights.
-     */
-    float mAttenuationConstant;
-
-    /** Linear light attenuation factor.
-     *
-     *  The intensity of the light source at a given distance 'd' from
-     *  the light's position is
-     *  @code
-     *  Atten = 1/( att0 + att1 * d + att2 * d*d)
-     *  @endcode
-     *  This member corresponds to the att1 variable in the equation.
-     *  Naturally undefined for directional lights.
-     */
-    float mAttenuationLinear;
-
-    /** Quadratic light attenuation factor.
-     *
-     *  The intensity of the light source at a given distance 'd' from
-     *  the light's position is
-     *  @code
-     *  Atten = 1/( att0 + att1 * d + att2 * d*d)
-     *  @endcode
-     *  This member corresponds to the att2 variable in the equation.
-     *  Naturally undefined for directional lights.
-     */
-    float mAttenuationQuadratic;
-
-    /** Diffuse color of the light source
-     *
-     *  The diffuse light color is multiplied with the diffuse
-     *  material color to obtain the final color that contributes
-     *  to the diffuse shading term.
-     */
-    C_STRUCT aiColor3D mColorDiffuse;
-
-    /** Specular color of the light source
-     *
-     *  The specular light color is multiplied with the specular
-     *  material color to obtain the final color that contributes
-     *  to the specular shading term.
-     */
-    C_STRUCT aiColor3D mColorSpecular;
-
-    /** Ambient color of the light source
-     *
-     *  The ambient light color is multiplied with the ambient
-     *  material color to obtain the final color that contributes
-     *  to the ambient shading term. Most renderers will ignore
-     *  this value it, is just a remaining of the fixed-function pipeline
-     *  that is still supported by quite many file formats.
-     */
-    C_STRUCT aiColor3D mColorAmbient;
-
-    /** Inner angle of a spot light's light cone.
-     *
-     *  The spot light has maximum influence on objects inside this
-     *  angle. The angle is given in radians. It is 2PI for point
-     *  lights and undefined for directional lights.
-     */
-    float mAngleInnerCone;
-
-    /** Outer angle of a spot light's light cone.
-     *
-     *  The spot light does not affect objects outside this angle.
-     *  The angle is given in radians. It is 2PI for point lights and
-     *  undefined for directional lights. The outer angle must be
-     *  greater than or equal to the inner angle.
-     *  It is assumed that the application uses a smooth
-     *  interpolation between the inner and the outer cone of the
-     *  spot light.
-     */
-    float mAngleOuterCone;
-
-    /** Size of area light source. */
-    C_STRUCT aiVector2D mSize;
-
-#ifdef __cplusplus
-
-    aiLight() AI_NO_EXCEPT
-        :   mType                 (aiLightSource_UNDEFINED)
-        ,   mAttenuationConstant  (0.f)
-        ,   mAttenuationLinear    (1.f)
-        ,   mAttenuationQuadratic (0.f)
-        ,   mAngleInnerCone       ((float)AI_MATH_TWO_PI)
-        ,   mAngleOuterCone       ((float)AI_MATH_TWO_PI)
-        ,   mSize                 (0.f, 0.f)
-    {
-    }
-
-#endif
-};
-
-#ifdef __cplusplus
-}
-#endif 
-
-
-#endif // !! AI_LIGHT_H_INC
diff --git a/thirdparty/assimp/include/assimp/material.h b/thirdparty/assimp/include/assimp/material.h
deleted file mode 100644
index 19a7c69709..0000000000
--- a/thirdparty/assimp/include/assimp/material.h
+++ /dev/null
@@ -1,1604 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file material.h
- *  @brief Defines the material system of the library
- */
-#pragma once
-#ifndef AI_MATERIAL_H_INC
-#define AI_MATERIAL_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// Name for default materials (2nd is used if meshes have UV coords)
-#define AI_DEFAULT_MATERIAL_NAME          "DefaultMaterial"
-
-// ---------------------------------------------------------------------------
-/** @brief Defines how the Nth texture of a specific type is combined with
- *  the result of all previous layers.
- *
- *  Example (left: key, right: value): <br>
- *  @code
- *  DiffColor0     - gray
- *  DiffTextureOp0 - aiTextureOpMultiply
- *  DiffTexture0   - tex1.png
- *  DiffTextureOp0 - aiTextureOpAdd
- *  DiffTexture1   - tex2.png
- *  @endcode
- *  Written as equation, the final diffuse term for a specific pixel would be:
- *  @code
- *  diffFinal = DiffColor0 * sampleTex(DiffTexture0,UV0) +
- *     sampleTex(DiffTexture1,UV0) * diffContrib;
- *  @endcode
- *  where 'diffContrib' is the intensity of the incoming light for that pixel.
- */
-enum aiTextureOp
-{
-    /** T = T1 * T2 */
-    aiTextureOp_Multiply = 0x0,
-
-    /** T = T1 + T2 */
-    aiTextureOp_Add = 0x1,
-
-    /** T = T1 - T2 */
-    aiTextureOp_Subtract = 0x2,
-
-    /** T = T1 / T2 */
-    aiTextureOp_Divide = 0x3,
-
-    /** T = (T1 + T2) - (T1 * T2) */
-    aiTextureOp_SmoothAdd = 0x4,
-
-    /** T = T1 + (T2-0.5) */
-    aiTextureOp_SignedAdd = 0x5,
-
-
-#ifndef SWIG
-    _aiTextureOp_Force32Bit = INT_MAX
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** @brief Defines how UV coordinates outside the [0...1] range are handled.
- *
- *  Commonly referred to as 'wrapping mode'.
- */
-enum aiTextureMapMode
-{
-    /** A texture coordinate u|v is translated to u%1|v%1
-     */
-    aiTextureMapMode_Wrap = 0x0,
-
-    /** Texture coordinates outside [0...1]
-     *  are clamped to the nearest valid value.
-     */
-    aiTextureMapMode_Clamp = 0x1,
-
-    /** If the texture coordinates for a pixel are outside [0...1]
-     *  the texture is not applied to that pixel
-     */
-    aiTextureMapMode_Decal = 0x3,
-
-    /** A texture coordinate u|v becomes u%1|v%1 if (u-(u%1))%2 is zero and
-     *  1-(u%1)|1-(v%1) otherwise
-     */
-    aiTextureMapMode_Mirror = 0x2,
-
-#ifndef SWIG
-    _aiTextureMapMode_Force32Bit = INT_MAX
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** @brief Defines how the mapping coords for a texture are generated.
- *
- *  Real-time applications typically require full UV coordinates, so the use of
- *  the aiProcess_GenUVCoords step is highly recommended. It generates proper
- *  UV channels for non-UV mapped objects, as long as an accurate description
- *  how the mapping should look like (e.g spherical) is given.
- *  See the #AI_MATKEY_MAPPING property for more details.
- */
-enum aiTextureMapping
-{
-    /** The mapping coordinates are taken from an UV channel.
-     *
-     *  The #AI_MATKEY_UVWSRC key specifies from which UV channel
-     *  the texture coordinates are to be taken from (remember,
-     *  meshes can have more than one UV channel).
-    */
-    aiTextureMapping_UV = 0x0,
-
-     /** Spherical mapping */
-    aiTextureMapping_SPHERE = 0x1,
-
-     /** Cylindrical mapping */
-    aiTextureMapping_CYLINDER = 0x2,
-
-     /** Cubic mapping */
-    aiTextureMapping_BOX = 0x3,
-
-     /** Planar mapping */
-    aiTextureMapping_PLANE = 0x4,
-
-     /** Undefined mapping. Have fun. */
-    aiTextureMapping_OTHER = 0x5,
-
-
-#ifndef SWIG
-    _aiTextureMapping_Force32Bit = INT_MAX
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** @brief Defines the purpose of a texture
- *
- *  This is a very difficult topic. Different 3D packages support different
- *  kinds of textures. For very common texture types, such as bumpmaps, the
- *  rendering results depend on implementation details in the rendering
- *  pipelines of these applications. Assimp loads all texture references from
- *  the model file and tries to determine which of the predefined texture
- *  types below is the best choice to match the original use of the texture
- *  as closely as possible.<br>
- *
- *  In content pipelines you'll usually define how textures have to be handled,
- *  and the artists working on models have to conform to this specification,
- *  regardless which 3D tool they're using.
- */
-enum aiTextureType
-{
-    /** Dummy value.
-     *
-     *  No texture, but the value to be used as 'texture semantic'
-     *  (#aiMaterialProperty::mSemantic) for all material properties
-     *  *not* related to textures.
-     */
-    aiTextureType_NONE = 0,
-
-    /** LEGACY API MATERIALS 
-     * Legacy refers to materials which 
-     * Were originally implemented in the specifications around 2000.
-     * These must never be removed, as most engines support them.
-     */
-
-    /** The texture is combined with the result of the diffuse
-     *  lighting equation.
-     */
-    aiTextureType_DIFFUSE = 1,
-
-    /** The texture is combined with the result of the specular
-     *  lighting equation.
-     */
-    aiTextureType_SPECULAR = 2,
-
-    /** The texture is combined with the result of the ambient
-     *  lighting equation.
-     */
-    aiTextureType_AMBIENT = 3,
-
-    /** The texture is added to the result of the lighting
-     *  calculation. It isn't influenced by incoming light.
-     */
-    aiTextureType_EMISSIVE = 4,
-
-    /** The texture is a height map.
-     *
-     *  By convention, higher gray-scale values stand for
-     *  higher elevations from the base height.
-     */
-    aiTextureType_HEIGHT = 5,
-
-    /** The texture is a (tangent space) normal-map.
-     *
-     *  Again, there are several conventions for tangent-space
-     *  normal maps. Assimp does (intentionally) not
-     *  distinguish here.
-     */
-    aiTextureType_NORMALS = 6,
-
-    /** The texture defines the glossiness of the material.
-     *
-     *  The glossiness is in fact the exponent of the specular
-     *  (phong) lighting equation. Usually there is a conversion
-     *  function defined to map the linear color values in the
-     *  texture to a suitable exponent. Have fun.
-    */
-    aiTextureType_SHININESS = 7,
-
-    /** The texture defines per-pixel opacity.
-     *
-     *  Usually 'white' means opaque and 'black' means
-     *  'transparency'. Or quite the opposite. Have fun.
-    */
-    aiTextureType_OPACITY = 8,
-
-    /** Displacement texture
-     *
-     *  The exact purpose and format is application-dependent.
-     *  Higher color values stand for higher vertex displacements.
-    */
-    aiTextureType_DISPLACEMENT = 9,
-
-    /** Lightmap texture (aka Ambient Occlusion)
-     *
-     *  Both 'Lightmaps' and dedicated 'ambient occlusion maps' are
-     *  covered by this material property. The texture contains a
-     *  scaling value for the final color value of a pixel. Its
-     *  intensity is not affected by incoming light.
-    */
-    aiTextureType_LIGHTMAP = 10,
-
-    /** Reflection texture
-     *
-     * Contains the color of a perfect mirror reflection.
-     * Rarely used, almost never for real-time applications.
-    */
-    aiTextureType_REFLECTION = 11,
-
-    /** PBR Materials
-     * PBR definitions from maya and other modelling packages now use this standard.
-     * This was originally introduced around 2012.
-     * Support for this is in game engines like Godot, Unreal or Unity3D.
-     * Modelling packages which use this are very common now.
-     */
-
-    aiTextureType_BASE_COLOR = 12,
-    aiTextureType_NORMAL_CAMERA = 13,
-    aiTextureType_EMISSION_COLOR = 14,
-    aiTextureType_METALNESS = 15,
-    aiTextureType_DIFFUSE_ROUGHNESS = 16,
-    aiTextureType_AMBIENT_OCCLUSION = 17,
-
-    /** Unknown texture
-     *
-     *  A texture reference that does not match any of the definitions
-     *  above is considered to be 'unknown'. It is still imported,
-     *  but is excluded from any further post-processing.
-    */
-    aiTextureType_UNKNOWN = 18,
-
-
-#ifndef SWIG
-    _aiTextureType_Force32Bit = INT_MAX
-#endif
-};
-
-#define AI_TEXTURE_TYPE_MAX  aiTextureType_UNKNOWN
-
-// ---------------------------------------------------------------------------
-/** @brief Defines all shading models supported by the library
- *
- *  The list of shading modes has been taken from Blender.
- *  See Blender documentation for more information. The API does
- *  not distinguish between "specular" and "diffuse" shaders (thus the
- *  specular term for diffuse shading models like Oren-Nayar remains
- *  undefined). <br>
- *  Again, this value is just a hint. Assimp tries to select the shader whose
- *  most common implementation matches the original rendering results of the
- *  3D modeller which wrote a particular model as closely as possible.
- */
-enum aiShadingMode
-{
-    /** Flat shading. Shading is done on per-face base,
-     *  diffuse only. Also known as 'faceted shading'.
-     */
-    aiShadingMode_Flat = 0x1,
-
-    /** Simple Gouraud shading.
-     */
-    aiShadingMode_Gouraud = 0x2,
-
-    /** Phong-Shading -
-     */
-    aiShadingMode_Phong = 0x3,
-
-    /** Phong-Blinn-Shading
-     */
-    aiShadingMode_Blinn = 0x4,
-
-    /** Toon-Shading per pixel
-     *
-     *  Also known as 'comic' shader.
-     */
-    aiShadingMode_Toon = 0x5,
-
-    /** OrenNayar-Shading per pixel
-     *
-     *  Extension to standard Lambertian shading, taking the
-     *  roughness of the material into account
-     */
-    aiShadingMode_OrenNayar = 0x6,
-
-    /** Minnaert-Shading per pixel
-     *
-     *  Extension to standard Lambertian shading, taking the
-     *  "darkness" of the material into account
-     */
-    aiShadingMode_Minnaert = 0x7,
-
-    /** CookTorrance-Shading per pixel
-     *
-     *  Special shader for metallic surfaces.
-     */
-    aiShadingMode_CookTorrance = 0x8,
-
-    /** No shading at all. Constant light influence of 1.0.
-    */
-    aiShadingMode_NoShading = 0x9,
-
-     /** Fresnel shading
-     */
-    aiShadingMode_Fresnel = 0xa,
-
-
-#ifndef SWIG
-    _aiShadingMode_Force32Bit = INT_MAX
-#endif
-};
-
-
-// ---------------------------------------------------------------------------
-/** @brief Defines some mixed flags for a particular texture.
- *
- *  Usually you'll instruct your cg artists how textures have to look like ...
- *  and how they will be processed in your application. However, if you use
- *  Assimp for completely generic loading purposes you might also need to
- *  process these flags in order to display as many 'unknown' 3D models as
- *  possible correctly.
- *
- *  This corresponds to the #AI_MATKEY_TEXFLAGS property.
-*/
-enum aiTextureFlags
-{
-    /** The texture's color values have to be inverted (component-wise 1-n)
-     */
-    aiTextureFlags_Invert = 0x1,
-
-    /** Explicit request to the application to process the alpha channel
-     *  of the texture.
-     *
-     *  Mutually exclusive with #aiTextureFlags_IgnoreAlpha. These
-     *  flags are set if the library can say for sure that the alpha
-     *  channel is used/is not used. If the model format does not
-     *  define this, it is left to the application to decide whether
-     *  the texture alpha channel - if any - is evaluated or not.
-     */
-    aiTextureFlags_UseAlpha = 0x2,
-
-    /** Explicit request to the application to ignore the alpha channel
-     *  of the texture.
-     *
-     *  Mutually exclusive with #aiTextureFlags_UseAlpha.
-     */
-    aiTextureFlags_IgnoreAlpha = 0x4,
-
-#ifndef SWIG
-      _aiTextureFlags_Force32Bit = INT_MAX
-#endif
-};
-
-
-// ---------------------------------------------------------------------------
-/** @brief Defines alpha-blend flags.
- *
- *  If you're familiar with OpenGL or D3D, these flags aren't new to you.
- *  They define *how* the final color value of a pixel is computed, basing
- *  on the previous color at that pixel and the new color value from the
- *  material.
- *  The blend formula is:
- *  @code
- *    SourceColor * SourceBlend + DestColor * DestBlend
- *  @endcode
- *  where DestColor is the previous color in the framebuffer at this
- *  position and SourceColor is the material color before the transparency
- *  calculation.<br>
- *  This corresponds to the #AI_MATKEY_BLEND_FUNC property.
-*/
-enum aiBlendMode
-{
-    /**
-     *  Formula:
-     *  @code
-     *  SourceColor*SourceAlpha + DestColor*(1-SourceAlpha)
-     *  @endcode
-     */
-    aiBlendMode_Default = 0x0,
-
-    /** Additive blending
-     *
-     *  Formula:
-     *  @code
-     *  SourceColor*1 + DestColor*1
-     *  @endcode
-     */
-    aiBlendMode_Additive = 0x1,
-
-    // we don't need more for the moment, but we might need them
-    // in future versions ...
-
-#ifndef SWIG
-    _aiBlendMode_Force32Bit = INT_MAX
-#endif
-};
-
-
-#include "./Compiler/pushpack1.h"
-
-// ---------------------------------------------------------------------------
-/** @brief Defines how an UV channel is transformed.
- *
- *  This is just a helper structure for the #AI_MATKEY_UVTRANSFORM key.
- *  See its documentation for more details.
- *
- *  Typically you'll want to build a matrix of this information. However,
- *  we keep separate scaling/translation/rotation values to make it
- *  easier to process and optimize UV transformations internally.
- */
-struct aiUVTransform
-{
-    /** Translation on the u and v axes.
-     *
-     *  The default value is (0|0).
-     */
-    C_STRUCT aiVector2D mTranslation;
-
-    /** Scaling on the u and v axes.
-     *
-     *  The default value is (1|1).
-     */
-    C_STRUCT aiVector2D mScaling;
-
-    /** Rotation - in counter-clockwise direction.
-     *
-     *  The rotation angle is specified in radians. The
-     *  rotation center is 0.5f|0.5f. The default value
-     *  0.f.
-     */
-    ai_real mRotation;
-
-
-#ifdef __cplusplus
-    aiUVTransform() AI_NO_EXCEPT
-        :   mTranslation (0.0,0.0)
-        ,   mScaling    (1.0,1.0)
-        ,   mRotation   (0.0)
-    {
-        // nothing to be done here ...
-    }
-#endif
-
-};
-
-#include "./Compiler/poppack1.h"
-
-//! @cond AI_DOX_INCLUDE_INTERNAL
-// ---------------------------------------------------------------------------
-/** @brief A very primitive RTTI system for the contents of material
- *  properties.
- */
-enum aiPropertyTypeInfo
-{
-    /** Array of single-precision (32 Bit) floats
-     *
-     *  It is possible to use aiGetMaterialInteger[Array]() (or the C++-API
-     *  aiMaterial::Get()) to query properties stored in floating-point format.
-     *  The material system performs the type conversion automatically.
-    */
-    aiPTI_Float   = 0x1,
-
-    /** Array of double-precision (64 Bit) floats
-     *
-     *  It is possible to use aiGetMaterialInteger[Array]() (or the C++-API
-     *  aiMaterial::Get()) to query properties stored in floating-point format.
-     *  The material system performs the type conversion automatically.
-    */
-    aiPTI_Double   = 0x2,
-
-    /** The material property is an aiString.
-     *
-     *  Arrays of strings aren't possible, aiGetMaterialString() (or the
-     *  C++-API aiMaterial::Get()) *must* be used to query a string property.
-    */
-    aiPTI_String  = 0x3,
-
-    /** Array of (32 Bit) integers
-     *
-     *  It is possible to use aiGetMaterialFloat[Array]() (or the C++-API
-     *  aiMaterial::Get()) to query properties stored in integer format.
-     *  The material system performs the type conversion automatically.
-    */
-    aiPTI_Integer = 0x4,
-
-
-    /** Simple binary buffer, content undefined. Not convertible to anything.
-    */
-    aiPTI_Buffer  = 0x5,
-
-
-     /** This value is not used. It is just there to force the
-     *  compiler to map this enum to a 32 Bit integer.
-     */
-#ifndef SWIG
-     _aiPTI_Force32Bit = INT_MAX
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** @brief Data structure for a single material property
- *
- *  As an user, you'll probably never need to deal with this data structure.
- *  Just use the provided aiGetMaterialXXX() or aiMaterial::Get() family
- *  of functions to query material properties easily. Processing them
- *  manually is faster, but it is not the recommended way. It isn't worth
- *  the effort. <br>
- *  Material property names follow a simple scheme:
- *  @code
- *    $<name>
- *    ?<name>
- *       A public property, there must be corresponding AI_MATKEY_XXX define
- *       2nd: Public, but ignored by the #aiProcess_RemoveRedundantMaterials
- *       post-processing step.
- *    ~<name>
- *       A temporary property for internal use.
- *  @endcode
- *  @see aiMaterial
- */
-struct aiMaterialProperty
-{
-    /** Specifies the name of the property (key)
-     *  Keys are generally case insensitive.
-     */
-    C_STRUCT aiString mKey;
-
-    /** Textures: Specifies their exact usage semantic.
-     * For non-texture properties, this member is always 0
-     * (or, better-said, #aiTextureType_NONE).
-     */
-    unsigned int mSemantic;
-
-    /** Textures: Specifies the index of the texture.
-     *  For non-texture properties, this member is always 0.
-     */
-    unsigned int mIndex;
-
-    /** Size of the buffer mData is pointing to, in bytes.
-     *  This value may not be 0.
-     */
-    unsigned int mDataLength;
-
-    /** Type information for the property.
-     *
-     * Defines the data layout inside the data buffer. This is used
-     * by the library internally to perform debug checks and to
-     * utilize proper type conversions.
-     * (It's probably a hacky solution, but it works.)
-     */
-    C_ENUM aiPropertyTypeInfo mType;
-
-    /** Binary buffer to hold the property's value.
-     * The size of the buffer is always mDataLength.
-     */
-    char* mData;
-
-#ifdef __cplusplus
-
-    aiMaterialProperty() AI_NO_EXCEPT
-    : mSemantic( 0 )
-    , mIndex( 0 )
-    , mDataLength( 0 )
-    , mType( aiPTI_Float )
-    , mData(nullptr) {
-        // empty
-    }
-
-    ~aiMaterialProperty()   {
-        delete[] mData;
-        mData = nullptr;
-    }
-
-#endif
-};
-//! @endcond
-
-#ifdef __cplusplus
-} // We need to leave the "C" block here to allow template member functions
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Data structure for a material
-*
-*  Material data is stored using a key-value structure. A single key-value
-*  pair is called a 'material property'. C++ users should use the provided
-*  member functions of aiMaterial to process material properties, C users
-*  have to stick with the aiMaterialGetXXX family of unbound functions.
-*  The library defines a set of standard keys (AI_MATKEY_XXX).
-*/
-#ifdef __cplusplus
-struct ASSIMP_API aiMaterial
-#else
-struct aiMaterial
-#endif
-{
-
-#ifdef __cplusplus
-
-public:
-
-    aiMaterial();
-    ~aiMaterial();
-
-    // -------------------------------------------------------------------
-    /**
-      * @brief  Returns the name of the material.
-      * @return The name of the material.
-      */
-    // -------------------------------------------------------------------
-    aiString GetName();
-
-    // -------------------------------------------------------------------
-    /** @brief Retrieve an array of Type values with a specific key
-     *  from the material
-     *
-     * @param pKey Key to search for. One of the AI_MATKEY_XXX constants.
-     * @param type .. set by AI_MATKEY_XXX
-     * @param idx .. set by AI_MATKEY_XXX
-     * @param pOut Pointer to a buffer to receive the result.
-     * @param pMax Specifies the size of the given buffer, in Type's.
-     * Receives the number of values (not bytes!) read.
-     * NULL is a valid value for this parameter.
-     */
-    template <typename Type>
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, Type* pOut, unsigned int* pMax) const;
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, int* pOut, unsigned int* pMax) const;
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, ai_real* pOut, unsigned int* pMax) const;
-
-    // -------------------------------------------------------------------
-    /** @brief Retrieve a Type value with a specific key
-     *  from the material
-     *
-     * @param pKey Key to search for. One of the AI_MATKEY_XXX constants.
-    * @param type Specifies the type of the texture to be retrieved (
-    *    e.g. diffuse, specular, height map ...)
-    * @param idx Index of the texture to be retrieved.
-     * @param pOut Reference to receive the output value
-     */
-    template <typename Type>
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx,Type& pOut) const;
-
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, int& pOut) const;
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, ai_real& pOut) const;
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, aiString& pOut) const;
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, aiColor3D& pOut) const;
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, aiColor4D& pOut) const;
-
-    aiReturn Get(const char* pKey,unsigned int type,
-        unsigned int idx, aiUVTransform& pOut) const;
-
-    // -------------------------------------------------------------------
-    /** Get the number of textures for a particular texture type.
-     *  @param type Texture type to check for
-     *  @return Number of textures for this type.
-     *  @note A texture can be easily queried using #GetTexture() */
-    unsigned int GetTextureCount(aiTextureType type) const;
-
-    // -------------------------------------------------------------------
-    /** Helper function to get all parameters pertaining to a
-     *  particular texture slot from a material.
-     *
-     *  This function is provided just for convenience, you could also
-     *  read the single material properties manually.
-     *  @param type Specifies the type of the texture to be retrieved (
-     *    e.g. diffuse, specular, height map ...)
-     *  @param index Index of the texture to be retrieved. The function fails
-     *    if there is no texture of that type with this index.
-     *    #GetTextureCount() can be used to determine the number of textures
-     *    per texture type.
-     *  @param path Receives the path to the texture.
-     *    If the texture is embedded, receives a '*' followed by the id of
-     *    the texture (for the textures stored in the corresponding scene) which
-     *    can be converted to an int using a function like atoi.
-     *    NULL is a valid value.
-     *  @param mapping The texture mapping.
-     *    NULL is allowed as value.
-     *  @param uvindex Receives the UV index of the texture.
-     *    NULL is a valid value.
-     *  @param blend Receives the blend factor for the texture
-     *    NULL is a valid value.
-     *  @param op Receives the texture operation to be performed between
-     *    this texture and the previous texture. NULL is allowed as value.
-     *  @param mapmode Receives the mapping modes to be used for the texture.
-     *    The parameter may be NULL but if it is a valid pointer it MUST
-     *    point to an array of 3 aiTextureMapMode's (one for each
-     *    axis: UVW order (=XYZ)).
-     */
-    // -------------------------------------------------------------------
-    aiReturn GetTexture(aiTextureType type,
-        unsigned int  index,
-        C_STRUCT aiString* path,
-        aiTextureMapping* mapping   = NULL,
-        unsigned int* uvindex       = NULL,
-        ai_real* blend              = NULL,
-        aiTextureOp* op             = NULL,
-        aiTextureMapMode* mapmode   = NULL) const;
-
-
-    // Setters
-
-
-    // ------------------------------------------------------------------------------
-    /** @brief Add a property with a given key and type info to the material
-     *  structure
-     *
-     *  @param pInput Pointer to input data
-     *  @param pSizeInBytes Size of input data
-     *  @param pKey Key/Usage of the property (AI_MATKEY_XXX)
-     *  @param type Set by the AI_MATKEY_XXX macro
-     *  @param index Set by the AI_MATKEY_XXX macro
-     *  @param pType Type information hint */
-    aiReturn AddBinaryProperty (const void* pInput,
-        unsigned int pSizeInBytes,
-        const char* pKey,
-        unsigned int type ,
-        unsigned int index ,
-        aiPropertyTypeInfo pType);
-
-    // ------------------------------------------------------------------------------
-    /** @brief Add a string property with a given key and type info to the
-     *  material structure
-     *
-     *  @param pInput Input string
-     *  @param pKey Key/Usage of the property (AI_MATKEY_XXX)
-     *  @param type Set by the AI_MATKEY_XXX macro
-     *  @param index Set by the AI_MATKEY_XXX macro */
-    aiReturn AddProperty (const aiString* pInput,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    // ------------------------------------------------------------------------------
-    /** @brief Add a property with a given key to the material structure
-     *  @param pInput Pointer to the input data
-     *  @param pNumValues Number of values in the array
-     *  @param pKey Key/Usage of the property (AI_MATKEY_XXX)
-     *  @param type Set by the AI_MATKEY_XXX macro
-     *  @param index Set by the AI_MATKEY_XXX macro  */
-    template<class TYPE>
-    aiReturn AddProperty (const TYPE* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    aiReturn AddProperty (const aiVector3D* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    aiReturn AddProperty (const aiColor3D* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    aiReturn AddProperty (const aiColor4D* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    aiReturn AddProperty (const int* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    aiReturn AddProperty (const float* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    aiReturn AddProperty (const double* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    aiReturn AddProperty (const aiUVTransform* pInput,
-        unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    // ------------------------------------------------------------------------------
-    /** @brief Remove a given key from the list.
-     *
-     *  The function fails if the key isn't found
-     *  @param pKey Key to be deleted
-     *  @param type Set by the AI_MATKEY_XXX macro
-     *  @param index Set by the AI_MATKEY_XXX macro  */
-    aiReturn RemoveProperty (const char* pKey,
-        unsigned int type  = 0,
-        unsigned int index = 0);
-
-    // ------------------------------------------------------------------------------
-    /** @brief Removes all properties from the material.
-     *
-     *  The data array remains allocated so adding new properties is quite fast.  */
-    void Clear();
-
-    // ------------------------------------------------------------------------------
-    /** Copy the property list of a material
-     *  @param pcDest Destination material
-     *  @param pcSrc Source material
-     */
-    static void CopyPropertyList(aiMaterial* pcDest,
-        const aiMaterial* pcSrc);
-
-
-#endif
-
-    /** List of all material properties loaded. */
-    C_STRUCT aiMaterialProperty** mProperties;
-
-    /** Number of properties in the data base */
-    unsigned int mNumProperties;
-
-     /** Storage allocated */
-    unsigned int mNumAllocated;
-};
-
-// Go back to extern "C" again
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_NAME "?mat.name",0,0
-#define AI_MATKEY_TWOSIDED "$mat.twosided",0,0
-#define AI_MATKEY_SHADING_MODEL "$mat.shadingm",0,0
-#define AI_MATKEY_ENABLE_WIREFRAME "$mat.wireframe",0,0
-#define AI_MATKEY_BLEND_FUNC "$mat.blend",0,0
-#define AI_MATKEY_OPACITY "$mat.opacity",0,0
-#define AI_MATKEY_TRANSPARENCYFACTOR "$mat.transparencyfactor",0,0
-#define AI_MATKEY_BUMPSCALING "$mat.bumpscaling",0,0
-#define AI_MATKEY_SHININESS "$mat.shininess",0,0
-#define AI_MATKEY_REFLECTIVITY "$mat.reflectivity",0,0
-#define AI_MATKEY_SHININESS_STRENGTH "$mat.shinpercent",0,0
-#define AI_MATKEY_REFRACTI "$mat.refracti",0,0
-#define AI_MATKEY_COLOR_DIFFUSE "$clr.diffuse",0,0
-#define AI_MATKEY_COLOR_AMBIENT "$clr.ambient",0,0
-#define AI_MATKEY_COLOR_SPECULAR "$clr.specular",0,0
-#define AI_MATKEY_COLOR_EMISSIVE "$clr.emissive",0,0
-#define AI_MATKEY_COLOR_TRANSPARENT "$clr.transparent",0,0
-#define AI_MATKEY_COLOR_REFLECTIVE "$clr.reflective",0,0
-#define AI_MATKEY_GLOBAL_BACKGROUND_IMAGE "?bg.global",0,0
-#define AI_MATKEY_GLOBAL_SHADERLANG "?sh.lang",0,0
-#define AI_MATKEY_SHADER_VERTEX "?sh.vs",0,0
-#define AI_MATKEY_SHADER_FRAGMENT "?sh.fs",0,0
-#define AI_MATKEY_SHADER_GEO "?sh.gs",0,0
-#define AI_MATKEY_SHADER_TESSELATION "?sh.ts",0,0
-#define AI_MATKEY_SHADER_PRIMITIVE "?sh.ps",0,0
-#define AI_MATKEY_SHADER_COMPUTE "?sh.cs",0,0
-
-// ---------------------------------------------------------------------------
-// Pure key names for all texture-related properties
-//! @cond MATS_DOC_FULL
-#define _AI_MATKEY_TEXTURE_BASE         "$tex.file"
-#define _AI_MATKEY_UVWSRC_BASE          "$tex.uvwsrc"
-#define _AI_MATKEY_TEXOP_BASE           "$tex.op"
-#define _AI_MATKEY_MAPPING_BASE         "$tex.mapping"
-#define _AI_MATKEY_TEXBLEND_BASE        "$tex.blend"
-#define _AI_MATKEY_MAPPINGMODE_U_BASE   "$tex.mapmodeu"
-#define _AI_MATKEY_MAPPINGMODE_V_BASE   "$tex.mapmodev"
-#define _AI_MATKEY_TEXMAP_AXIS_BASE     "$tex.mapaxis"
-#define _AI_MATKEY_UVTRANSFORM_BASE     "$tex.uvtrafo"
-#define _AI_MATKEY_TEXFLAGS_BASE        "$tex.flags"
-//! @endcond
-
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_TEXTURE(type, N) _AI_MATKEY_TEXTURE_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_TEXTURE_DIFFUSE(N)    \
-    AI_MATKEY_TEXTURE(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_TEXTURE_SPECULAR(N)   \
-    AI_MATKEY_TEXTURE(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_TEXTURE_AMBIENT(N)    \
-    AI_MATKEY_TEXTURE(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_TEXTURE_EMISSIVE(N)   \
-    AI_MATKEY_TEXTURE(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_TEXTURE_NORMALS(N)    \
-    AI_MATKEY_TEXTURE(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_TEXTURE_HEIGHT(N) \
-    AI_MATKEY_TEXTURE(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_TEXTURE_SHININESS(N)  \
-    AI_MATKEY_TEXTURE(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_TEXTURE_OPACITY(N)    \
-    AI_MATKEY_TEXTURE(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_TEXTURE_DISPLACEMENT(N)   \
-    AI_MATKEY_TEXTURE(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_TEXTURE_LIGHTMAP(N)   \
-    AI_MATKEY_TEXTURE(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_TEXTURE_REFLECTION(N) \
-    AI_MATKEY_TEXTURE(aiTextureType_REFLECTION,N)
-
-//! @endcond
-
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_UVWSRC(type, N) _AI_MATKEY_UVWSRC_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_UVWSRC_DIFFUSE(N) \
-    AI_MATKEY_UVWSRC(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_UVWSRC_SPECULAR(N)    \
-    AI_MATKEY_UVWSRC(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_UVWSRC_AMBIENT(N) \
-    AI_MATKEY_UVWSRC(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_UVWSRC_EMISSIVE(N)    \
-    AI_MATKEY_UVWSRC(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_UVWSRC_NORMALS(N) \
-    AI_MATKEY_UVWSRC(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_UVWSRC_HEIGHT(N)  \
-    AI_MATKEY_UVWSRC(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_UVWSRC_SHININESS(N)   \
-    AI_MATKEY_UVWSRC(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_UVWSRC_OPACITY(N) \
-    AI_MATKEY_UVWSRC(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_UVWSRC_DISPLACEMENT(N)    \
-    AI_MATKEY_UVWSRC(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_UVWSRC_LIGHTMAP(N)    \
-    AI_MATKEY_UVWSRC(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_UVWSRC_REFLECTION(N)  \
-    AI_MATKEY_UVWSRC(aiTextureType_REFLECTION,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_TEXOP(type, N) _AI_MATKEY_TEXOP_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_TEXOP_DIFFUSE(N)  \
-    AI_MATKEY_TEXOP(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_TEXOP_SPECULAR(N) \
-    AI_MATKEY_TEXOP(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_TEXOP_AMBIENT(N)  \
-    AI_MATKEY_TEXOP(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_TEXOP_EMISSIVE(N) \
-    AI_MATKEY_TEXOP(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_TEXOP_NORMALS(N)  \
-    AI_MATKEY_TEXOP(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_TEXOP_HEIGHT(N)   \
-    AI_MATKEY_TEXOP(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_TEXOP_SHININESS(N)    \
-    AI_MATKEY_TEXOP(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_TEXOP_OPACITY(N)  \
-    AI_MATKEY_TEXOP(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_TEXOP_DISPLACEMENT(N) \
-    AI_MATKEY_TEXOP(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_TEXOP_LIGHTMAP(N) \
-    AI_MATKEY_TEXOP(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_TEXOP_REFLECTION(N)   \
-    AI_MATKEY_TEXOP(aiTextureType_REFLECTION,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_MAPPING(type, N) _AI_MATKEY_MAPPING_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_MAPPING_DIFFUSE(N)    \
-    AI_MATKEY_MAPPING(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_MAPPING_SPECULAR(N)   \
-    AI_MATKEY_MAPPING(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_MAPPING_AMBIENT(N)    \
-    AI_MATKEY_MAPPING(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_MAPPING_EMISSIVE(N)   \
-    AI_MATKEY_MAPPING(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_MAPPING_NORMALS(N)    \
-    AI_MATKEY_MAPPING(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_MAPPING_HEIGHT(N) \
-    AI_MATKEY_MAPPING(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_MAPPING_SHININESS(N)  \
-    AI_MATKEY_MAPPING(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_MAPPING_OPACITY(N)    \
-    AI_MATKEY_MAPPING(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_MAPPING_DISPLACEMENT(N)   \
-    AI_MATKEY_MAPPING(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_MAPPING_LIGHTMAP(N)   \
-    AI_MATKEY_MAPPING(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_MAPPING_REFLECTION(N) \
-    AI_MATKEY_MAPPING(aiTextureType_REFLECTION,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_TEXBLEND(type, N) _AI_MATKEY_TEXBLEND_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_TEXBLEND_DIFFUSE(N)   \
-    AI_MATKEY_TEXBLEND(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_TEXBLEND_SPECULAR(N)  \
-    AI_MATKEY_TEXBLEND(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_TEXBLEND_AMBIENT(N)   \
-    AI_MATKEY_TEXBLEND(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_TEXBLEND_EMISSIVE(N)  \
-    AI_MATKEY_TEXBLEND(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_TEXBLEND_NORMALS(N)   \
-    AI_MATKEY_TEXBLEND(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_TEXBLEND_HEIGHT(N)    \
-    AI_MATKEY_TEXBLEND(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_TEXBLEND_SHININESS(N) \
-    AI_MATKEY_TEXBLEND(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_TEXBLEND_OPACITY(N)   \
-    AI_MATKEY_TEXBLEND(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_TEXBLEND_DISPLACEMENT(N)  \
-    AI_MATKEY_TEXBLEND(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_TEXBLEND_LIGHTMAP(N)  \
-    AI_MATKEY_TEXBLEND(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_TEXBLEND_REFLECTION(N)    \
-    AI_MATKEY_TEXBLEND(aiTextureType_REFLECTION,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_MAPPINGMODE_U(type, N) _AI_MATKEY_MAPPINGMODE_U_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_MAPPINGMODE_U_DIFFUSE(N)  \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_SPECULAR(N) \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_AMBIENT(N)  \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_EMISSIVE(N) \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_NORMALS(N)  \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_HEIGHT(N)   \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_SHININESS(N)    \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_OPACITY(N)  \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_DISPLACEMENT(N) \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_LIGHTMAP(N) \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_MAPPINGMODE_U_REFLECTION(N)   \
-    AI_MATKEY_MAPPINGMODE_U(aiTextureType_REFLECTION,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_MAPPINGMODE_V(type, N) _AI_MATKEY_MAPPINGMODE_V_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_MAPPINGMODE_V_DIFFUSE(N)  \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_SPECULAR(N) \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_AMBIENT(N)  \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_EMISSIVE(N) \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_NORMALS(N)  \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_HEIGHT(N)   \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_SHININESS(N)    \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_OPACITY(N)  \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_DISPLACEMENT(N) \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_LIGHTMAP(N) \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_MAPPINGMODE_V_REFLECTION(N)   \
-    AI_MATKEY_MAPPINGMODE_V(aiTextureType_REFLECTION,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_TEXMAP_AXIS(type, N) _AI_MATKEY_TEXMAP_AXIS_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_TEXMAP_AXIS_DIFFUSE(N)    \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_SPECULAR(N)   \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_AMBIENT(N)    \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_EMISSIVE(N)   \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_NORMALS(N)    \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_HEIGHT(N) \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_SHININESS(N)  \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_OPACITY(N)    \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_DISPLACEMENT(N)   \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_LIGHTMAP(N)   \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_TEXMAP_AXIS_REFLECTION(N) \
-    AI_MATKEY_TEXMAP_AXIS(aiTextureType_REFLECTION,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_UVTRANSFORM(type, N) _AI_MATKEY_UVTRANSFORM_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_UVTRANSFORM_DIFFUSE(N)    \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_UVTRANSFORM_SPECULAR(N)   \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_UVTRANSFORM_AMBIENT(N)    \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_UVTRANSFORM_EMISSIVE(N)   \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_UVTRANSFORM_NORMALS(N)    \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_UVTRANSFORM_HEIGHT(N) \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_UVTRANSFORM_SHININESS(N)  \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_UVTRANSFORM_OPACITY(N)    \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_UVTRANSFORM_DISPLACEMENT(N)   \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_UVTRANSFORM_LIGHTMAP(N)   \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_UVTRANSFORM_REFLECTION(N) \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_REFLECTION,N)
-
-#define AI_MATKEY_UVTRANSFORM_UNKNOWN(N)    \
-    AI_MATKEY_UVTRANSFORM(aiTextureType_UNKNOWN,N)
-
-//! @endcond
-// ---------------------------------------------------------------------------
-#define AI_MATKEY_TEXFLAGS(type, N) _AI_MATKEY_TEXFLAGS_BASE,type,N
-
-// For backward compatibility and simplicity
-//! @cond MATS_DOC_FULL
-#define AI_MATKEY_TEXFLAGS_DIFFUSE(N)   \
-    AI_MATKEY_TEXFLAGS(aiTextureType_DIFFUSE,N)
-
-#define AI_MATKEY_TEXFLAGS_SPECULAR(N)  \
-    AI_MATKEY_TEXFLAGS(aiTextureType_SPECULAR,N)
-
-#define AI_MATKEY_TEXFLAGS_AMBIENT(N)   \
-    AI_MATKEY_TEXFLAGS(aiTextureType_AMBIENT,N)
-
-#define AI_MATKEY_TEXFLAGS_EMISSIVE(N)  \
-    AI_MATKEY_TEXFLAGS(aiTextureType_EMISSIVE,N)
-
-#define AI_MATKEY_TEXFLAGS_NORMALS(N)   \
-    AI_MATKEY_TEXFLAGS(aiTextureType_NORMALS,N)
-
-#define AI_MATKEY_TEXFLAGS_HEIGHT(N)    \
-    AI_MATKEY_TEXFLAGS(aiTextureType_HEIGHT,N)
-
-#define AI_MATKEY_TEXFLAGS_SHININESS(N) \
-    AI_MATKEY_TEXFLAGS(aiTextureType_SHININESS,N)
-
-#define AI_MATKEY_TEXFLAGS_OPACITY(N)   \
-    AI_MATKEY_TEXFLAGS(aiTextureType_OPACITY,N)
-
-#define AI_MATKEY_TEXFLAGS_DISPLACEMENT(N)  \
-    AI_MATKEY_TEXFLAGS(aiTextureType_DISPLACEMENT,N)
-
-#define AI_MATKEY_TEXFLAGS_LIGHTMAP(N)  \
-    AI_MATKEY_TEXFLAGS(aiTextureType_LIGHTMAP,N)
-
-#define AI_MATKEY_TEXFLAGS_REFLECTION(N)    \
-    AI_MATKEY_TEXFLAGS(aiTextureType_REFLECTION,N)
-
-#define AI_MATKEY_TEXFLAGS_UNKNOWN(N)   \
-    AI_MATKEY_TEXFLAGS(aiTextureType_UNKNOWN,N)
-
-//! @endcond
-//!
-// ---------------------------------------------------------------------------
-/** @brief Retrieve a material property with a specific key from the material
- *
- * @param pMat Pointer to the input material. May not be NULL
- * @param pKey Key to search for. One of the AI_MATKEY_XXX constants.
- * @param type Specifies the type of the texture to be retrieved (
- *    e.g. diffuse, specular, height map ...)
- * @param index Index of the texture to be retrieved.
- * @param pPropOut Pointer to receive a pointer to a valid aiMaterialProperty
- *        structure or NULL if the key has not been found. */
-// ---------------------------------------------------------------------------
-ASSIMP_API C_ENUM aiReturn aiGetMaterialProperty(
-    const C_STRUCT aiMaterial* pMat,
-    const char* pKey,
-    unsigned int type,
-    unsigned int  index,
-    const C_STRUCT aiMaterialProperty** pPropOut);
-
-// ---------------------------------------------------------------------------
-/** @brief Retrieve an array of float values with a specific key
- *  from the material
- *
- * Pass one of the AI_MATKEY_XXX constants for the last three parameters (the
- * example reads the #AI_MATKEY_UVTRANSFORM property of the first diffuse texture)
- * @code
- * aiUVTransform trafo;
- * unsigned int max = sizeof(aiUVTransform);
- * if (AI_SUCCESS != aiGetMaterialFloatArray(mat, AI_MATKEY_UVTRANSFORM(aiTextureType_DIFFUSE,0),
- *    (float*)&trafo, &max) || sizeof(aiUVTransform) != max)
- * {
- *   // error handling
- * }
- * @endcode
- *
- * @param pMat Pointer to the input material. May not be NULL
- * @param pKey Key to search for. One of the AI_MATKEY_XXX constants.
- * @param pOut Pointer to a buffer to receive the result.
- * @param pMax Specifies the size of the given buffer, in float's.
- *        Receives the number of values (not bytes!) read.
- * @param type (see the code sample above)
- * @param index (see the code sample above)
- * @return Specifies whether the key has been found. If not, the output
- *   arrays remains unmodified and pMax is set to 0.*/
-// ---------------------------------------------------------------------------
-ASSIMP_API C_ENUM aiReturn aiGetMaterialFloatArray(
-    const C_STRUCT aiMaterial* pMat,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index,
-    ai_real* pOut,
-    unsigned int* pMax);
-
-
-#ifdef __cplusplus
-
-// ---------------------------------------------------------------------------
-/** @brief Retrieve a single float property with a specific key from the material.
-*
-* Pass one of the AI_MATKEY_XXX constants for the last three parameters (the
-* example reads the #AI_MATKEY_SHININESS_STRENGTH property of the first diffuse texture)
-* @code
-* float specStrength = 1.f; // default value, remains unmodified if we fail.
-* aiGetMaterialFloat(mat, AI_MATKEY_SHININESS_STRENGTH,
-*    (float*)&specStrength);
-* @endcode
-*
-* @param pMat Pointer to the input material. May not be NULL
-* @param pKey Key to search for. One of the AI_MATKEY_XXX constants.
-* @param pOut Receives the output float.
-* @param type (see the code sample above)
-* @param index (see the code sample above)
-* @return Specifies whether the key has been found. If not, the output
-*   float remains unmodified.*/
-// ---------------------------------------------------------------------------
-inline aiReturn aiGetMaterialFloat(const aiMaterial* pMat,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index,
-    ai_real* pOut)
-{
-    return aiGetMaterialFloatArray(pMat,pKey,type,index,pOut,(unsigned int*)0x0);
-}
-
-#else
-
-// Use our friend, the C preprocessor
-#define aiGetMaterialFloat (pMat, type, index, pKey, pOut) \
-    aiGetMaterialFloatArray(pMat, type, index, pKey, pOut, NULL)
-
-#endif //!__cplusplus
-
-
-// ---------------------------------------------------------------------------
-/** @brief Retrieve an array of integer values with a specific key
- *  from a material
- *
- * See the sample for aiGetMaterialFloatArray for more information.*/
-ASSIMP_API C_ENUM aiReturn aiGetMaterialIntegerArray(const C_STRUCT aiMaterial* pMat,
-     const char* pKey,
-     unsigned int  type,
-     unsigned int  index,
-     int* pOut,
-     unsigned int* pMax);
-
-
-#ifdef __cplusplus
-
-// ---------------------------------------------------------------------------
-/** @brief Retrieve an integer property with a specific key from a material
- *
- * See the sample for aiGetMaterialFloat for more information.*/
-// ---------------------------------------------------------------------------
-inline aiReturn aiGetMaterialInteger(const C_STRUCT aiMaterial* pMat,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index,
-    int* pOut)
-{
-    return aiGetMaterialIntegerArray(pMat,pKey,type,index,pOut,(unsigned int*)0x0);
-}
-
-#else
-
-// use our friend, the C preprocessor
-#define aiGetMaterialInteger (pMat, type, index, pKey, pOut) \
-    aiGetMaterialIntegerArray(pMat, type, index, pKey, pOut, NULL)
-
-#endif //!__cplusplus
-
-// ---------------------------------------------------------------------------
-/** @brief Retrieve a color value from the material property table
-*
-* See the sample for aiGetMaterialFloat for more information*/
-// ---------------------------------------------------------------------------
-ASSIMP_API C_ENUM aiReturn aiGetMaterialColor(const C_STRUCT aiMaterial* pMat,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index,
-    C_STRUCT aiColor4D* pOut);
-
-
-// ---------------------------------------------------------------------------
-/** @brief Retrieve a aiUVTransform value from the material property table
-*
-* See the sample for aiGetMaterialFloat for more information*/
-// ---------------------------------------------------------------------------
-ASSIMP_API C_ENUM aiReturn aiGetMaterialUVTransform(const C_STRUCT aiMaterial* pMat,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index,
-    C_STRUCT aiUVTransform* pOut);
-
-
-// ---------------------------------------------------------------------------
-/** @brief Retrieve a string from the material property table
-*
-* See the sample for aiGetMaterialFloat for more information.*/
-// ---------------------------------------------------------------------------
-ASSIMP_API C_ENUM aiReturn aiGetMaterialString(const C_STRUCT aiMaterial* pMat,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index,
-    C_STRUCT aiString* pOut);
-
-// ---------------------------------------------------------------------------
-/** Get the number of textures for a particular texture type.
- *  @param[in] pMat Pointer to the input material. May not be NULL
- *  @param type Texture type to check for
- *  @return Number of textures for this type.
- *  @note A texture can be easily queried using #aiGetMaterialTexture() */
-// ---------------------------------------------------------------------------
-ASSIMP_API unsigned int aiGetMaterialTextureCount(const C_STRUCT aiMaterial* pMat,
-    C_ENUM aiTextureType type);
-
-// ---------------------------------------------------------------------------
-/** @brief Helper function to get all values pertaining to a particular
- *  texture slot from a material structure.
- *
- *  This function is provided just for convenience. You could also read the
- *  texture by parsing all of its properties manually. This function bundles
- *  all of them in a huge function monster.
- *
- *  @param[in] mat Pointer to the input material. May not be NULL
- *  @param[in] type Specifies the texture stack to read from (e.g. diffuse,
- *     specular, height map ...).
- *  @param[in] index Index of the texture. The function fails if the
- *     requested index is not available for this texture type.
- *     #aiGetMaterialTextureCount() can be used to determine the number of
- *     textures in a particular texture stack.
- *  @param[out] path Receives the output path
- *     If the texture is embedded, receives a '*' followed by the id of
- *     the texture (for the textures stored in the corresponding scene) which
- *     can be converted to an int using a function like atoi.
- *     This parameter must be non-null.
- *  @param mapping The texture mapping mode to be used.
- *      Pass NULL if you're not interested in this information.
- *  @param[out] uvindex For UV-mapped textures: receives the index of the UV
- *      source channel. Unmodified otherwise.
- *      Pass NULL if you're not interested in this information.
- *  @param[out] blend Receives the blend factor for the texture
- *      Pass NULL if you're not interested in this information.
- *  @param[out] op Receives the texture blend operation to be perform between
- *      this texture and the previous texture.
- *      Pass NULL if you're not interested in this information.
- *  @param[out] mapmode Receives the mapping modes to be used for the texture.
- *      Pass NULL if you're not interested in this information. Otherwise,
- *      pass a pointer to an array of two aiTextureMapMode's (one for each
- *      axis, UV order).
- *  @param[out] flags Receives the the texture flags.
- *  @return AI_SUCCESS on success, otherwise something else. Have fun.*/
-// ---------------------------------------------------------------------------
-#ifdef __cplusplus
-ASSIMP_API aiReturn aiGetMaterialTexture(const C_STRUCT aiMaterial* mat,
-    aiTextureType type,
-    unsigned int  index,
-    aiString* path,
-    aiTextureMapping* mapping   = NULL,
-    unsigned int* uvindex       = NULL,
-    ai_real* blend              = NULL,
-    aiTextureOp* op             = NULL,
-    aiTextureMapMode* mapmode   = NULL,
-    unsigned int* flags         = NULL);
-#else
-C_ENUM aiReturn aiGetMaterialTexture(const C_STRUCT aiMaterial* mat,
-    C_ENUM aiTextureType type,
-    unsigned int  index,
-    C_STRUCT aiString* path,
-    C_ENUM aiTextureMapping* mapping    /*= NULL*/,
-    unsigned int* uvindex               /*= NULL*/,
-    ai_real* blend                      /*= NULL*/,
-    C_ENUM aiTextureOp* op              /*= NULL*/,
-    C_ENUM aiTextureMapMode* mapmode    /*= NULL*/,
-    unsigned int* flags                 /*= NULL*/);
-#endif // !#ifdef __cplusplus
-
-
-#ifdef __cplusplus
-}
-
-#include "material.inl"
-
-#endif //!__cplusplus
-
-#endif //!!AI_MATERIAL_H_INC
diff --git a/thirdparty/assimp/include/assimp/material.inl b/thirdparty/assimp/include/assimp/material.inl
deleted file mode 100644
index 8ae6b88d3e..0000000000
--- a/thirdparty/assimp/include/assimp/material.inl
+++ /dev/null
@@ -1,389 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file material.inl
- *  @brief Defines the C++ getters for the material system
- */
-
-#pragma once
-#ifndef AI_MATERIAL_INL_INC
-#define AI_MATERIAL_INL_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiPropertyTypeInfo ai_real_to_property_type_info(float) {
-	return aiPTI_Float;
-}
-
-AI_FORCE_INLINE
-aiPropertyTypeInfo ai_real_to_property_type_info(double) {
-	return aiPTI_Double;
-}
-// ---------------------------------------------------------------------------
-
-//! @cond never
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::GetTexture( aiTextureType type,
-       unsigned int  index,
-       C_STRUCT aiString* path,
-       aiTextureMapping* mapping    /*= NULL*/,
-       unsigned int* uvindex        /*= NULL*/,
-       ai_real* blend               /*= NULL*/,
-       aiTextureOp* op              /*= NULL*/,
-       aiTextureMapMode* mapmode    /*= NULL*/) const {
-    return ::aiGetMaterialTexture(this,type,index,path,mapping,uvindex,blend,op,mapmode);
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-unsigned int aiMaterial::GetTextureCount(aiTextureType type) const {
-    return ::aiGetMaterialTextureCount(this,type);
-}
-
-// ---------------------------------------------------------------------------
-template <typename Type>
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx, Type* pOut,
-        unsigned int* pMax) const {
-    unsigned int iNum = pMax ? *pMax : 1;
-
-    const aiMaterialProperty* prop;
-    const aiReturn ret = ::aiGetMaterialProperty(this,pKey,type,idx,
-        (const aiMaterialProperty**)&prop);
-    if ( AI_SUCCESS == ret )    {
-
-        if (prop->mDataLength < sizeof(Type)*iNum) {
-            return AI_FAILURE;
-        }
-
-        if (prop->mType != aiPTI_Buffer) {
-            return AI_FAILURE;
-        }
-
-        iNum = std::min((size_t)iNum,prop->mDataLength / sizeof(Type));
-        ::memcpy(pOut,prop->mData,iNum * sizeof(Type));
-        if (pMax) {
-            *pMax = iNum;
-        }
-    }
-    return ret;
-}
-
-// ---------------------------------------------------------------------------
-template <typename Type>
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,Type& pOut) const {
-    const aiMaterialProperty* prop;
-    const aiReturn ret = ::aiGetMaterialProperty(this,pKey,type,idx,
-        (const aiMaterialProperty**)&prop);
-    if ( AI_SUCCESS == ret ) {
-
-        if (prop->mDataLength < sizeof(Type)) {
-            return AI_FAILURE;
-        }
-
-        if (prop->mType != aiPTI_Buffer) {
-            return AI_FAILURE;
-        }
-
-        ::memcpy( &pOut, prop->mData, sizeof( Type ) );
-    }
-    return ret;
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,ai_real* pOut,
-        unsigned int* pMax) const {
-    return ::aiGetMaterialFloatArray(this,pKey,type,idx,pOut,pMax);
-}
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,int* pOut,
-        unsigned int* pMax) const {
-    return ::aiGetMaterialIntegerArray(this,pKey,type,idx,pOut,pMax);
-}
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,ai_real& pOut) const {
-    return aiGetMaterialFloat(this,pKey,type,idx,&pOut);
-}
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,int& pOut) const {
-    return aiGetMaterialInteger(this,pKey,type,idx,&pOut);
-}
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,aiColor4D& pOut) const {
-    return aiGetMaterialColor(this,pKey,type,idx,&pOut);
-}
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,aiColor3D& pOut) const {
-    aiColor4D c;
-    const aiReturn ret = aiGetMaterialColor(this,pKey,type,idx,&c);
-    pOut = aiColor3D(c.r,c.g,c.b);
-    return ret;
-}
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,aiString& pOut) const {
-    return aiGetMaterialString(this,pKey,type,idx,&pOut);
-}
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE aiReturn aiMaterial::Get(const char* pKey,unsigned int type,
-        unsigned int idx,aiUVTransform& pOut) const {
-    return aiGetMaterialUVTransform(this,pKey,type,idx,&pOut);
-}
-
-// ---------------------------------------------------------------------------
-template<class TYPE>
-aiReturn aiMaterial::AddProperty (const TYPE* pInput,
-    const unsigned int pNumValues,
-    const char* pKey,
-    unsigned int type,
-    unsigned int index)
-{
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(TYPE),
-        pKey,type,index,aiPTI_Buffer);
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE aiReturn aiMaterial::AddProperty(const float* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(float),
-        pKey,type,index,aiPTI_Float);
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const double* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(double),
-        pKey,type,index,aiPTI_Double);
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiUVTransform* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiUVTransform),
-        pKey,type,index,ai_real_to_property_type_info(pInput->mRotation));
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiColor4D* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiColor4D),
-        pKey,type,index,ai_real_to_property_type_info(pInput->a));
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiColor3D* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiColor3D),
-        pKey,type,index,ai_real_to_property_type_info(pInput->b));
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const aiVector3D* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiVector3D),
-        pKey,type,index,ai_real_to_property_type_info(pInput->x));
-}
-
-// ---------------------------------------------------------------------------
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty(const int* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(int),
-        pKey,type,index,aiPTI_Integer);
-}
-
-
-// ---------------------------------------------------------------------------
-// The template specializations below are for backwards compatibility.
-// The recommended way to add material properties is using the non-template
-// overloads.
-// ---------------------------------------------------------------------------
-
-// ---------------------------------------------------------------------------
-template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<float>(const float* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(float),
-        pKey,type,index,aiPTI_Float);
-}
-
-// ---------------------------------------------------------------------------
-template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<double>(const double* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(double),
-        pKey,type,index,aiPTI_Double);
-}
-
-// ---------------------------------------------------------------------------
-template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiUVTransform>(const aiUVTransform* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiUVTransform),
-        pKey,type,index,aiPTI_Float);
-}
-
-// ---------------------------------------------------------------------------
-template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiColor4D>(const aiColor4D* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiColor4D),
-        pKey,type,index,aiPTI_Float);
-}
-
-// ---------------------------------------------------------------------------
-template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiColor3D>(const aiColor3D* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiColor3D),
-        pKey,type,index,aiPTI_Float);
-}
-
-// ---------------------------------------------------------------------------
-template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<aiVector3D>(const aiVector3D* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(aiVector3D),
-        pKey,type,index,aiPTI_Float);
-}
-
-// ---------------------------------------------------------------------------
-template<>
-AI_FORCE_INLINE
-aiReturn aiMaterial::AddProperty<int>(const int* pInput,
-        const unsigned int pNumValues,
-        const char* pKey,
-        unsigned int type,
-        unsigned int index) {
-    return AddBinaryProperty((const void*)pInput,
-        pNumValues * sizeof(int),
-        pKey,type,index,aiPTI_Integer);
-}
-
-//! @endcond
-
-#endif //! AI_MATERIAL_INL_INC
diff --git a/thirdparty/assimp/include/assimp/matrix3x3.h b/thirdparty/assimp/include/assimp/matrix3x3.h
deleted file mode 100644
index 2c26cf92bb..0000000000
--- a/thirdparty/assimp/include/assimp/matrix3x3.h
+++ /dev/null
@@ -1,180 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file matrix3x3.h
- *  @brief Definition of a 3x3 matrix, including operators when compiling in C++
- */
-#pragma once
-#ifndef AI_MATRIX3X3_H_INC
-#define AI_MATRIX3X3_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/defs.h>
-
-#ifdef __cplusplus
-
-template <typename T> class aiMatrix4x4t;
-template <typename T> class aiVector2t;
-
-// ---------------------------------------------------------------------------
-/** @brief Represents a row-major 3x3 matrix
- *
- *  There's much confusion about matrix layouts (column vs. row order).
- *  This is *always* a row-major matrix. Not even with the
- *  #aiProcess_ConvertToLeftHanded flag, which absolutely does not affect
- *  matrix order - it just affects the handedness of the coordinate system
- *  defined thereby.
- */
-template <typename TReal>
-class aiMatrix3x3t {
-public:
-    aiMatrix3x3t() AI_NO_EXCEPT :
-        a1(static_cast<TReal>(1.0f)), a2(), a3(),
-        b1(), b2(static_cast<TReal>(1.0f)), b3(),
-        c1(), c2(), c3(static_cast<TReal>(1.0f)) {}
-
-    aiMatrix3x3t (  TReal _a1, TReal _a2, TReal _a3,
-                    TReal _b1, TReal _b2, TReal _b3,
-                    TReal _c1, TReal _c2, TReal _c3) :
-        a1(_a1), a2(_a2), a3(_a3),
-        b1(_b1), b2(_b2), b3(_b3),
-        c1(_c1), c2(_c2), c3(_c3)
-    {}
-
-    // matrix multiplication.
-    aiMatrix3x3t& operator *= (const aiMatrix3x3t& m);
-    aiMatrix3x3t  operator  * (const aiMatrix3x3t& m) const;
-
-    // array access operators
-    TReal* operator[]       (unsigned int p_iIndex);
-    const TReal* operator[] (unsigned int p_iIndex) const;
-
-    // comparison operators
-    bool operator== (const aiMatrix4x4t<TReal>& m) const;
-    bool operator!= (const aiMatrix4x4t<TReal>& m) const;
-
-    bool Equal(const aiMatrix4x4t<TReal>& m, TReal epsilon = 1e-6) const;
-
-    template <typename TOther>
-    operator aiMatrix3x3t<TOther> () const;
-
-    // -------------------------------------------------------------------
-    /** @brief Construction from a 4x4 matrix. The remaining parts
-     *  of the matrix are ignored.
-     */
-    explicit aiMatrix3x3t( const aiMatrix4x4t<TReal>& pMatrix);
-
-    // -------------------------------------------------------------------
-    /** @brief Transpose the matrix
-     */
-    aiMatrix3x3t& Transpose();
-
-    // -------------------------------------------------------------------
-    /** @brief Invert the matrix.
-     *  If the matrix is not invertible all elements are set to qnan.
-     *  Beware, use (f != f) to check whether a TReal f is qnan.
-     */
-    aiMatrix3x3t& Inverse();
-    TReal Determinant() const;
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a rotation matrix for a rotation around z
-     *  @param a Rotation angle, in radians
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix3x3t& RotationZ(TReal a, aiMatrix3x3t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a rotation matrix for a rotation around
-     *    an arbitrary axis.
-     *
-     *  @param a Rotation angle, in radians
-     *  @param axis Axis to rotate around
-     *  @param out To be filled
-     */
-    static aiMatrix3x3t& Rotation( TReal a,
-        const aiVector3t<TReal>& axis, aiMatrix3x3t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a translation matrix
-     *  @param v Translation vector
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix3x3t& Translation( const aiVector2t<TReal>& v, aiMatrix3x3t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief A function for creating a rotation matrix that rotates a
-     *  vector called "from" into another vector called "to".
-     * Input : from[3], to[3] which both must be *normalized* non-zero vectors
-     * Output: mtx[3][3] -- a 3x3 matrix in column-major form
-     * Authors: Tomas Möller, John Hughes
-     *          "Efficiently Building a Matrix to Rotate One Vector to Another"
-     *          Journal of Graphics Tools, 4(4):1-4, 1999
-     */
-    static aiMatrix3x3t& FromToMatrix(const aiVector3t<TReal>& from,
-        const aiVector3t<TReal>& to, aiMatrix3x3t& out);
-
-public:
-    TReal a1, a2, a3;
-    TReal b1, b2, b3;
-    TReal c1, c2, c3;
-};
-
-typedef aiMatrix3x3t<ai_real> aiMatrix3x3;
-
-#else
-
-struct aiMatrix3x3 {
-    ai_real a1, a2, a3;
-    ai_real b1, b2, b3;
-    ai_real c1, c2, c3;
-};
-
-#endif // __cplusplus
-
-#endif // AI_MATRIX3X3_H_INC
diff --git a/thirdparty/assimp/include/assimp/matrix3x3.inl b/thirdparty/assimp/include/assimp/matrix3x3.inl
deleted file mode 100644
index 1ce8c9691c..0000000000
--- a/thirdparty/assimp/include/assimp/matrix3x3.inl
+++ /dev/null
@@ -1,361 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file matrix3x3.inl
- *  @brief Inline implementation of the 3x3 matrix operators
- */
-#pragma once
-#ifndef AI_MATRIX3X3_INL_INC
-#define AI_MATRIX3X3_INL_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef __cplusplus
-#include <assimp/matrix3x3.h>
-#include <assimp/matrix4x4.h>
-
-#include <algorithm>
-#include <cmath>
-#include <limits>
-
-// ------------------------------------------------------------------------------------------------
-// Construction from a 4x4 matrix. The remaining parts of the matrix are ignored.
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal>::aiMatrix3x3t( const aiMatrix4x4t<TReal>& pMatrix) {
-    a1 = pMatrix.a1; a2 = pMatrix.a2; a3 = pMatrix.a3;
-    b1 = pMatrix.b1; b2 = pMatrix.b2; b3 = pMatrix.b3;
-    c1 = pMatrix.c1; c2 = pMatrix.c2; c3 = pMatrix.c3;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal>& aiMatrix3x3t<TReal>::operator *= (const aiMatrix3x3t<TReal>& m) {
-    *this = aiMatrix3x3t<TReal>(m.a1 * a1 + m.b1 * a2 + m.c1 * a3,
-        m.a2 * a1 + m.b2 * a2 + m.c2 * a3,
-        m.a3 * a1 + m.b3 * a2 + m.c3 * a3,
-        m.a1 * b1 + m.b1 * b2 + m.c1 * b3,
-        m.a2 * b1 + m.b2 * b2 + m.c2 * b3,
-        m.a3 * b1 + m.b3 * b2 + m.c3 * b3,
-        m.a1 * c1 + m.b1 * c2 + m.c1 * c3,
-        m.a2 * c1 + m.b2 * c2 + m.c2 * c3,
-        m.a3 * c1 + m.b3 * c2 + m.c3 * c3);
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-template <typename TOther>
-aiMatrix3x3t<TReal>::operator aiMatrix3x3t<TOther> () const {
-    return aiMatrix3x3t<TOther>(static_cast<TOther>(a1),static_cast<TOther>(a2),static_cast<TOther>(a3),
-        static_cast<TOther>(b1),static_cast<TOther>(b2),static_cast<TOther>(b3),
-        static_cast<TOther>(c1),static_cast<TOther>(c2),static_cast<TOther>(c3));
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal> aiMatrix3x3t<TReal>::operator* (const aiMatrix3x3t<TReal>& m) const {
-    aiMatrix3x3t<TReal> temp( *this);
-    temp *= m;
-    return temp;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal* aiMatrix3x3t<TReal>::operator[] (unsigned int p_iIndex) {
-    switch ( p_iIndex ) {
-        case 0:
-            return &a1;
-        case 1:
-            return &b1;
-        case 2:
-            return &c1;
-        default:
-            break;
-    }
-    return &a1;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const TReal* aiMatrix3x3t<TReal>::operator[] (unsigned int p_iIndex) const {
-    switch ( p_iIndex ) {
-        case 0:
-            return &a1;
-        case 1:
-            return &b1;
-        case 2:
-            return &c1;
-        default:
-            break;
-    }
-    return &a1;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiMatrix3x3t<TReal>::operator== (const aiMatrix4x4t<TReal>& m) const {
-    return a1 == m.a1 && a2 == m.a2 && a3 == m.a3 &&
-           b1 == m.b1 && b2 == m.b2 && b3 == m.b3 &&
-           c1 == m.c1 && c2 == m.c2 && c3 == m.c3;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiMatrix3x3t<TReal>::operator!= (const aiMatrix4x4t<TReal>& m) const {
-    return !(*this == m);
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-AI_FORCE_INLINE
-bool aiMatrix3x3t<TReal>::Equal(const aiMatrix4x4t<TReal>& m, TReal epsilon) const {
-    return
-        std::abs(a1 - m.a1) <= epsilon &&
-        std::abs(a2 - m.a2) <= epsilon &&
-        std::abs(a3 - m.a3) <= epsilon &&
-        std::abs(b1 - m.b1) <= epsilon &&
-        std::abs(b2 - m.b2) <= epsilon &&
-        std::abs(b3 - m.b3) <= epsilon &&
-        std::abs(c1 - m.c1) <= epsilon &&
-        std::abs(c2 - m.c2) <= epsilon &&
-        std::abs(c3 - m.c3) <= epsilon;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal>& aiMatrix3x3t<TReal>::Transpose() {
-    // (TReal&) don't remove, GCC complains cause of packed fields
-    std::swap( (TReal&)a2, (TReal&)b1);
-    std::swap( (TReal&)a3, (TReal&)c1);
-    std::swap( (TReal&)b3, (TReal&)c2);
-    return *this;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal aiMatrix3x3t<TReal>::Determinant() const {
-    return a1*b2*c3 - a1*b3*c2 + a2*b3*c1 - a2*b1*c3 + a3*b1*c2 - a3*b2*c1;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal>& aiMatrix3x3t<TReal>::Inverse() {
-    // Compute the reciprocal determinant
-    TReal det = Determinant();
-    if(det == static_cast<TReal>(0.0))
-    {
-        // Matrix not invertible. Setting all elements to nan is not really
-        // correct in a mathematical sense; but at least qnans are easy to
-        // spot. XXX we might throw an exception instead, which would
-        // be even much better to spot :/.
-        const TReal nan = std::numeric_limits<TReal>::quiet_NaN();
-        *this = aiMatrix3x3t<TReal>( nan,nan,nan,nan,nan,nan,nan,nan,nan);
-
-        return *this;
-    }
-
-    TReal invdet = static_cast<TReal>(1.0) / det;
-
-    aiMatrix3x3t<TReal> res;
-    res.a1 = invdet  * (b2 * c3 - b3 * c2);
-    res.a2 = -invdet * (a2 * c3 - a3 * c2);
-    res.a3 = invdet  * (a2 * b3 - a3 * b2);
-    res.b1 = -invdet * (b1 * c3 - b3 * c1);
-    res.b2 = invdet  * (a1 * c3 - a3 * c1);
-    res.b3 = -invdet * (a1 * b3 - a3 * b1);
-    res.c1 = invdet  * (b1 * c2 - b2 * c1);
-    res.c2 = -invdet * (a1 * c2 - a2 * c1);
-    res.c3 = invdet  * (a1 * b2 - a2 * b1);
-    *this = res;
-
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal>& aiMatrix3x3t<TReal>::RotationZ(TReal a, aiMatrix3x3t<TReal>& out) {
-    out.a1 = out.b2 = std::cos(a);
-    out.b1 = std::sin(a);
-    out.a2 = - out.b1;
-
-    out.a3 = out.b3 = out.c1 = out.c2 = 0.f;
-    out.c3 = 1.f;
-
-    return out;
-}
-
-// ------------------------------------------------------------------------------------------------
-// Returns a rotation matrix for a rotation around an arbitrary axis.
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal>& aiMatrix3x3t<TReal>::Rotation( TReal a, const aiVector3t<TReal>& axis, aiMatrix3x3t<TReal>& out) {
-  TReal c = std::cos( a), s = std::sin( a), t = 1 - c;
-  TReal x = axis.x, y = axis.y, z = axis.z;
-
-  // Many thanks to MathWorld and Wikipedia
-  out.a1 = t*x*x + c;   out.a2 = t*x*y - s*z; out.a3 = t*x*z + s*y;
-  out.b1 = t*x*y + s*z; out.b2 = t*y*y + c;   out.b3 = t*y*z - s*x;
-  out.c1 = t*x*z - s*y; out.c2 = t*y*z + s*x; out.c3 = t*z*z + c;
-
-  return out;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix3x3t<TReal>& aiMatrix3x3t<TReal>::Translation( const aiVector2t<TReal>& v, aiMatrix3x3t<TReal>& out) {
-    out = aiMatrix3x3t<TReal>();
-    out.a3 = v.x;
-    out.b3 = v.y;
-    return out;
-}
-
-// ----------------------------------------------------------------------------------------
-/** A function for creating a rotation matrix that rotates a vector called
- * "from" into another vector called "to".
- * Input : from[3], to[3] which both must be *normalized* non-zero vectors
- * Output: mtx[3][3] -- a 3x3 matrix in colum-major form
- * Authors: Tomas Möller, John Hughes
- *          "Efficiently Building a Matrix to Rotate One Vector to Another"
- *          Journal of Graphics Tools, 4(4):1-4, 1999
- */
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE aiMatrix3x3t<TReal>& aiMatrix3x3t<TReal>::FromToMatrix(const aiVector3t<TReal>& from,
-        const aiVector3t<TReal>& to, aiMatrix3x3t<TReal>& mtx) {
-    const TReal e = from * to;
-    const TReal f = (e < 0)? -e:e;
-
-    if (f > static_cast<TReal>(1.0) - static_cast<TReal>(0.00001))     /* "from" and "to"-vector almost parallel */
-    {
-        aiVector3D u,v;     /* temporary storage vectors */
-        aiVector3D x;       /* vector most nearly orthogonal to "from" */
-
-        x.x = (from.x > 0.0)? from.x : -from.x;
-        x.y = (from.y > 0.0)? from.y : -from.y;
-        x.z = (from.z > 0.0)? from.z : -from.z;
-
-        if (x.x < x.y)
-        {
-            if (x.x < x.z)
-            {
-                x.x = static_cast<TReal>(1.0);
-                x.y = x.z = static_cast<TReal>(0.0);
-            }
-            else
-            {
-                x.z = static_cast<TReal>(1.0);
-                x.x = x.y = static_cast<TReal>(0.0);
-            }
-        }
-        else
-        {
-            if (x.y < x.z)
-            {
-                x.y = static_cast<TReal>(1.0);
-                x.x = x.z = static_cast<TReal>(0.0);
-            }
-            else
-            {
-                x.z = static_cast<TReal>(1.0);
-                x.x = x.y = static_cast<TReal>(0.0);
-            }
-        }
-
-        u.x = x.x - from.x; u.y = x.y - from.y; u.z = x.z - from.z;
-        v.x = x.x - to.x;   v.y = x.y - to.y;   v.z = x.z - to.z;
-
-        const TReal c1_ = static_cast<TReal>(2.0) / (u * u);
-        const TReal c2_ = static_cast<TReal>(2.0) / (v * v);
-        const TReal c3_ = c1_ * c2_  * (u * v);
-
-        for (unsigned int i = 0; i < 3; i++)
-        {
-            for (unsigned int j = 0; j < 3; j++)
-            {
-                mtx[i][j] =  - c1_ * u[i] * u[j] - c2_ * v[i] * v[j]
-                    + c3_ * v[i] * u[j];
-            }
-            mtx[i][i] += static_cast<TReal>(1.0);
-        }
-    }
-    else  /* the most common case, unless "from"="to", or "from"=-"to" */
-    {
-        const aiVector3D v = from ^ to;
-        /* ... use this hand optimized version (9 mults less) */
-        const TReal h = static_cast<TReal>(1.0)/(static_cast<TReal>(1.0) + e);      /* optimization by Gottfried Chen */
-        const TReal hvx = h * v.x;
-        const TReal hvz = h * v.z;
-        const TReal hvxy = hvx * v.y;
-        const TReal hvxz = hvx * v.z;
-        const TReal hvyz = hvz * v.y;
-        mtx[0][0] = e + hvx * v.x;
-        mtx[0][1] = hvxy - v.z;
-        mtx[0][2] = hvxz + v.y;
-
-        mtx[1][0] = hvxy + v.z;
-        mtx[1][1] = e + h * v.y * v.y;
-        mtx[1][2] = hvyz - v.x;
-
-        mtx[2][0] = hvxz - v.y;
-        mtx[2][1] = hvyz + v.x;
-        mtx[2][2] = e + hvz * v.z;
-    }
-    return mtx;
-}
-
-#endif // __cplusplus
-#endif // AI_MATRIX3X3_INL_INC
diff --git a/thirdparty/assimp/include/assimp/matrix4x4.h b/thirdparty/assimp/include/assimp/matrix4x4.h
deleted file mode 100644
index 8fc216f669..0000000000
--- a/thirdparty/assimp/include/assimp/matrix4x4.h
+++ /dev/null
@@ -1,276 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-/** @file matrix4x4.h
- *  @brief 4x4 matrix structure, including operators when compiling in C++
- */
-#pragma once
-#ifndef AI_MATRIX4X4_H_INC
-#define AI_MATRIX4X4_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/vector3.h>
-#include <assimp/defs.h>
-
-#ifdef __cplusplus
-
-template<typename TReal> class aiMatrix3x3t;
-template<typename TReal> class aiQuaterniont;
-
-// ---------------------------------------------------------------------------
-/** @brief Represents a row-major 4x4 matrix, use this for homogeneous
- *   coordinates.
- *
- *  There's much confusion about matrix layouts (column vs. row order).
- *  This is *always* a row-major matrix. Not even with the
- *  #aiProcess_ConvertToLeftHanded flag, which absolutely does not affect
- *  matrix order - it just affects the handedness of the coordinate system
- *  defined thereby.
- */
-template<typename TReal>
-class aiMatrix4x4t {
-public:
-
-    /** set to identity */
-    aiMatrix4x4t() AI_NO_EXCEPT;
-
-    /** construction from single values */
-    aiMatrix4x4t (  TReal _a1, TReal _a2, TReal _a3, TReal _a4,
-                    TReal _b1, TReal _b2, TReal _b3, TReal _b4,
-                    TReal _c1, TReal _c2, TReal _c3, TReal _c4,
-                    TReal _d1, TReal _d2, TReal _d3, TReal _d4);
-
-
-    /** construction from 3x3 matrix, remaining elements are set to identity */
-    explicit aiMatrix4x4t( const aiMatrix3x3t<TReal>& m);
-
-    /** construction from position, rotation and scaling components
-     * @param scaling The scaling for the x,y,z axes
-     * @param rotation The rotation as a hamilton quaternion
-     * @param position The position for the x,y,z axes
-     */
-    aiMatrix4x4t(const aiVector3t<TReal>& scaling, const aiQuaterniont<TReal>& rotation,
-        const aiVector3t<TReal>& position);
-
-    // array access operators
-	/** @fn TReal* operator[] (unsigned int p_iIndex)
-	 *  @param [in] p_iIndex - index of the row.
-	 *  @return pointer to pointed row.
-	 */
-    TReal* operator[]       (unsigned int p_iIndex);
-
-	/** @fn const TReal* operator[] (unsigned int p_iIndex) const
-	 *  @overload TReal* operator[] (unsigned int p_iIndex)
-	 */
-    const TReal* operator[] (unsigned int p_iIndex) const;
-
-    // comparison operators
-    bool operator== (const aiMatrix4x4t& m) const;
-    bool operator!= (const aiMatrix4x4t& m) const;
-
-    bool Equal(const aiMatrix4x4t& m, TReal epsilon = 1e-6) const;
-
-    // matrix multiplication.
-    aiMatrix4x4t& operator *= (const aiMatrix4x4t& m);
-    aiMatrix4x4t  operator *  (const aiMatrix4x4t& m) const;
-    aiMatrix4x4t operator * (const TReal& aFloat) const;
-    aiMatrix4x4t operator + (const aiMatrix4x4t& aMatrix) const;
-
-    template <typename TOther>
-    operator aiMatrix4x4t<TOther> () const;
-
-    // -------------------------------------------------------------------
-    /** @brief Transpose the matrix */
-    aiMatrix4x4t& Transpose();
-
-    // -------------------------------------------------------------------
-    /** @brief Invert the matrix.
-     *  If the matrix is not invertible all elements are set to qnan.
-     *  Beware, use (f != f) to check whether a TReal f is qnan.
-     */
-    aiMatrix4x4t& Inverse();
-    TReal Determinant() const;
-
-
-    // -------------------------------------------------------------------
-    /** @brief Returns true of the matrix is the identity matrix.
-     *  The check is performed against a not so small epsilon.
-     */
-    inline bool IsIdentity() const;
-
-    // -------------------------------------------------------------------
-    /** @brief Decompose a trafo matrix into its original components
-     *  @param scaling Receives the output scaling for the x,y,z axes
-     *  @param rotation Receives the output rotation as a hamilton
-     *   quaternion
-     *  @param position Receives the output position for the x,y,z axes
-     */
-    void Decompose (aiVector3t<TReal>& scaling, aiQuaterniont<TReal>& rotation,
-        aiVector3t<TReal>& position) const;
-
-	// -------------------------------------------------------------------
-	/** @fn void Decompose(aiVector3t<TReal>& pScaling, aiVector3t<TReal>& pRotation, aiVector3t<TReal>& pPosition) const
-     *  @brief Decompose a trafo matrix into its original components.
-     * Thx to good FAQ at http://www.gamedev.ru/code/articles/faq_matrix_quat
-     *  @param [out] pScaling - Receives the output scaling for the x,y,z axes.
-     *  @param [out] pRotation - Receives the output rotation as a Euler angles.
-     *  @param [out] pPosition - Receives the output position for the x,y,z axes.
-     */
-    void Decompose(aiVector3t<TReal>& pScaling, aiVector3t<TReal>& pRotation, aiVector3t<TReal>& pPosition) const;
-
-	// -------------------------------------------------------------------
-	/** @fn void Decompose(aiVector3t<TReal>& pScaling, aiVector3t<TReal>& pRotationAxis, TReal& pRotationAngle, aiVector3t<TReal>& pPosition) const
-     *  @brief Decompose a trafo matrix into its original components
-	 * Thx to good FAQ at http://www.gamedev.ru/code/articles/faq_matrix_quat
-     *  @param [out] pScaling - Receives the output scaling for the x,y,z axes.
-     *  @param [out] pRotationAxis - Receives the output rotation axis.
-	 *  @param [out] pRotationAngle - Receives the output rotation angle for @ref pRotationAxis.
-     *  @param [out] pPosition - Receives the output position for the x,y,z axes.
-     */
-    void Decompose(aiVector3t<TReal>& pScaling, aiVector3t<TReal>& pRotationAxis, TReal& pRotationAngle, aiVector3t<TReal>& pPosition) const;
-
-    // -------------------------------------------------------------------
-    /** @brief Decompose a trafo matrix with no scaling into its
-     *    original components
-     *  @param rotation Receives the output rotation as a hamilton
-     *    quaternion
-     *  @param position Receives the output position for the x,y,z axes
-     */
-    void DecomposeNoScaling (aiQuaterniont<TReal>& rotation,
-        aiVector3t<TReal>& position) const;
-
-    // -------------------------------------------------------------------
-    /** @brief Creates a trafo matrix from a set of euler angles
-     *  @param x Rotation angle for the x-axis, in radians
-     *  @param y Rotation angle for the y-axis, in radians
-     *  @param z Rotation angle for the z-axis, in radians
-     */
-    aiMatrix4x4t& FromEulerAnglesXYZ(TReal x, TReal y, TReal z);
-    aiMatrix4x4t& FromEulerAnglesXYZ(const aiVector3t<TReal>& blubb);
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a rotation matrix for a rotation around the x axis
-     *  @param a Rotation angle, in radians
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix4x4t& RotationX(TReal a, aiMatrix4x4t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a rotation matrix for a rotation around the y axis
-     *  @param a Rotation angle, in radians
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix4x4t& RotationY(TReal a, aiMatrix4x4t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a rotation matrix for a rotation around the z axis
-     *  @param a Rotation angle, in radians
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix4x4t& RotationZ(TReal a, aiMatrix4x4t& out);
-
-    // -------------------------------------------------------------------
-    /** Returns a rotation matrix for a rotation around an arbitrary axis.
-     *  @param a Rotation angle, in radians
-     *  @param axis Rotation axis, should be a normalized vector.
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix4x4t& Rotation(TReal a, const aiVector3t<TReal>& axis,
-            aiMatrix4x4t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a translation matrix
-     *  @param v Translation vector
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix4x4t& Translation( const aiVector3t<TReal>& v, 
-            aiMatrix4x4t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief Returns a scaling matrix
-     *  @param v Scaling vector
-     *  @param out Receives the output matrix
-     *  @return Reference to the output matrix
-     */
-    static aiMatrix4x4t& Scaling( const aiVector3t<TReal>& v, aiMatrix4x4t& out);
-
-    // -------------------------------------------------------------------
-    /** @brief A function for creating a rotation matrix that rotates a
-     *  vector called "from" into another vector called "to".
-     * Input : from[3], to[3] which both must be *normalized* non-zero vectors
-     * Output: mtx[3][3] -- a 3x3 matrix in column-major form
-     * Authors: Tomas Mueller, John Hughes
-     *          "Efficiently Building a Matrix to Rotate One Vector to Another"
-     *          Journal of Graphics Tools, 4(4):1-4, 1999
-     */
-    static aiMatrix4x4t& FromToMatrix(const aiVector3t<TReal>& from,
-            const aiVector3t<TReal>& to, aiMatrix4x4t& out);
-
-    TReal a1, a2, a3, a4;
-    TReal b1, b2, b3, b4;
-    TReal c1, c2, c3, c4;
-    TReal d1, d2, d3, d4;
-};
-
-typedef aiMatrix4x4t<ai_real> aiMatrix4x4;
-
-#else
-
-struct aiMatrix4x4 {
-    ai_real a1, a2, a3, a4;
-    ai_real b1, b2, b3, b4;
-    ai_real c1, c2, c3, c4;
-    ai_real d1, d2, d3, d4;
-};
-
-
-#endif // __cplusplus
-
-#endif // AI_MATRIX4X4_H_INC
diff --git a/thirdparty/assimp/include/assimp/matrix4x4.inl b/thirdparty/assimp/include/assimp/matrix4x4.inl
deleted file mode 100644
index 84079974f7..0000000000
--- a/thirdparty/assimp/include/assimp/matrix4x4.inl
+++ /dev/null
@@ -1,677 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file matrix4x4.inl
- *  @brief Inline implementation of the 4x4 matrix operators
- */
-#pragma once
-#ifndef AI_MATRIX4X4_INL_INC
-#define AI_MATRIX4X4_INL_INC
-
-#ifdef __cplusplus
-
-#include "matrix4x4.h"
-#include "matrix3x3.h"
-#include "quaternion.h"
-#include "MathFunctions.h"
-
-#include <algorithm>
-#include <limits>
-#include <cmath>
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-aiMatrix4x4t<TReal>::aiMatrix4x4t() AI_NO_EXCEPT :
-        a1(1.0f), a2(), a3(), a4(),
-        b1(), b2(1.0f), b3(), b4(),
-        c1(), c2(), c3(1.0f), c4(),
-        d1(), d2(), d3(), d4(1.0f) {
-    // empty
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-aiMatrix4x4t<TReal>::aiMatrix4x4t (TReal _a1, TReal _a2, TReal _a3, TReal _a4,
-              TReal _b1, TReal _b2, TReal _b3, TReal _b4,
-              TReal _c1, TReal _c2, TReal _c3, TReal _c4,
-              TReal _d1, TReal _d2, TReal _d3, TReal _d4) :
-        a1(_a1), a2(_a2), a3(_a3), a4(_a4),
-        b1(_b1), b2(_b2), b3(_b3), b4(_b4),
-        c1(_c1), c2(_c2), c3(_c3), c4(_c4),
-        d1(_d1), d2(_d2), d3(_d3), d4(_d4) {
-    // empty
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-template <typename TOther>
-aiMatrix4x4t<TReal>::operator aiMatrix4x4t<TOther> () const {
-    return aiMatrix4x4t<TOther>(static_cast<TOther>(a1),static_cast<TOther>(a2),static_cast<TOther>(a3),static_cast<TOther>(a4),
-        static_cast<TOther>(b1),static_cast<TOther>(b2),static_cast<TOther>(b3),static_cast<TOther>(b4),
-        static_cast<TOther>(c1),static_cast<TOther>(c2),static_cast<TOther>(c3),static_cast<TOther>(c4),
-        static_cast<TOther>(d1),static_cast<TOther>(d2),static_cast<TOther>(d3),static_cast<TOther>(d4));
-}
-
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>::aiMatrix4x4t (const aiMatrix3x3t<TReal>& m) {
-    a1 = m.a1; a2 = m.a2; a3 = m.a3; a4 = static_cast<TReal>(0.0);
-    b1 = m.b1; b2 = m.b2; b3 = m.b3; b4 = static_cast<TReal>(0.0);
-    c1 = m.c1; c2 = m.c2; c3 = m.c3; c4 = static_cast<TReal>(0.0);
-    d1 = static_cast<TReal>(0.0); d2 = static_cast<TReal>(0.0); d3 = static_cast<TReal>(0.0); d4 = static_cast<TReal>(1.0);
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>::aiMatrix4x4t (const aiVector3t<TReal>& scaling, const aiQuaterniont<TReal>& rotation, const aiVector3t<TReal>& position) {
-    // build a 3x3 rotation matrix
-    aiMatrix3x3t<TReal> m = rotation.GetMatrix();
-
-    a1 = m.a1 * scaling.x;
-    a2 = m.a2 * scaling.x;
-    a3 = m.a3 * scaling.x;
-    a4 = position.x;
-
-    b1 = m.b1 * scaling.y;
-    b2 = m.b2 * scaling.y;
-    b3 = m.b3 * scaling.y;
-    b4 = position.y;
-
-    c1 = m.c1 * scaling.z;
-    c2 = m.c2 * scaling.z;
-    c3 = m.c3 * scaling.z;
-    c4= position.z;
-
-    d1 = static_cast<TReal>(0.0);
-    d2 = static_cast<TReal>(0.0);
-    d3 = static_cast<TReal>(0.0);
-    d4 = static_cast<TReal>(1.0);
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::operator *= (const aiMatrix4x4t<TReal>& m) {
-    *this = aiMatrix4x4t<TReal>(
-        m.a1 * a1 + m.b1 * a2 + m.c1 * a3 + m.d1 * a4,
-        m.a2 * a1 + m.b2 * a2 + m.c2 * a3 + m.d2 * a4,
-        m.a3 * a1 + m.b3 * a2 + m.c3 * a3 + m.d3 * a4,
-        m.a4 * a1 + m.b4 * a2 + m.c4 * a3 + m.d4 * a4,
-        m.a1 * b1 + m.b1 * b2 + m.c1 * b3 + m.d1 * b4,
-        m.a2 * b1 + m.b2 * b2 + m.c2 * b3 + m.d2 * b4,
-        m.a3 * b1 + m.b3 * b2 + m.c3 * b3 + m.d3 * b4,
-        m.a4 * b1 + m.b4 * b2 + m.c4 * b3 + m.d4 * b4,
-        m.a1 * c1 + m.b1 * c2 + m.c1 * c3 + m.d1 * c4,
-        m.a2 * c1 + m.b2 * c2 + m.c2 * c3 + m.d2 * c4,
-        m.a3 * c1 + m.b3 * c2 + m.c3 * c3 + m.d3 * c4,
-        m.a4 * c1 + m.b4 * c2 + m.c4 * c3 + m.d4 * c4,
-        m.a1 * d1 + m.b1 * d2 + m.c1 * d3 + m.d1 * d4,
-        m.a2 * d1 + m.b2 * d2 + m.c2 * d3 + m.d2 * d4,
-        m.a3 * d1 + m.b3 * d2 + m.c3 * d3 + m.d3 * d4,
-        m.a4 * d1 + m.b4 * d2 + m.c4 * d3 + m.d4 * d4);
-    return *this;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE aiMatrix4x4t<TReal> aiMatrix4x4t<TReal>::operator* (const TReal& aFloat) const {
-    aiMatrix4x4t<TReal> temp(
-        a1 * aFloat,
-        a2 * aFloat,
-        a3 * aFloat,
-        a4 * aFloat,
-        b1 * aFloat,
-        b2 * aFloat,
-        b3 * aFloat,
-        b4 * aFloat,
-        c1 * aFloat,
-        c2 * aFloat,
-        c3 * aFloat,
-        c4 * aFloat,
-        d1 * aFloat,
-        d2 * aFloat,
-        d3 * aFloat,
-        d4 * aFloat);
-    return temp;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal> aiMatrix4x4t<TReal>::operator+ (const aiMatrix4x4t<TReal>& m) const {
-    aiMatrix4x4t<TReal> temp(
-        m.a1 + a1,
-        m.a2 + a2,
-        m.a3 + a3,
-        m.a4 + a4,
-        m.b1 + b1,
-        m.b2 + b2,
-        m.b3 + b3,
-        m.b4 + b4,
-        m.c1 + c1,
-        m.c2 + c2,
-        m.c3 + c3,
-        m.c4 + c4,
-        m.d1 + d1,
-        m.d2 + d2,
-        m.d3 + d3,
-        m.d4 + d4);
-    return temp;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal> aiMatrix4x4t<TReal>::operator* (const aiMatrix4x4t<TReal>& m) const {
-    aiMatrix4x4t<TReal> temp( *this);
-    temp *= m;
-    return temp;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::Transpose() {
-    // (TReal&) don't remove, GCC complains cause of packed fields
-    std::swap( (TReal&)b1, (TReal&)a2);
-    std::swap( (TReal&)c1, (TReal&)a3);
-    std::swap( (TReal&)c2, (TReal&)b3);
-    std::swap( (TReal&)d1, (TReal&)a4);
-    std::swap( (TReal&)d2, (TReal&)b4);
-    std::swap( (TReal&)d3, (TReal&)c4);
-    return *this;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal aiMatrix4x4t<TReal>::Determinant() const {
-    return a1*b2*c3*d4 - a1*b2*c4*d3 + a1*b3*c4*d2 - a1*b3*c2*d4
-        + a1*b4*c2*d3 - a1*b4*c3*d2 - a2*b3*c4*d1 + a2*b3*c1*d4
-        - a2*b4*c1*d3 + a2*b4*c3*d1 - a2*b1*c3*d4 + a2*b1*c4*d3
-        + a3*b4*c1*d2 - a3*b4*c2*d1 + a3*b1*c2*d4 - a3*b1*c4*d2
-        + a3*b2*c4*d1 - a3*b2*c1*d4 - a4*b1*c2*d3 + a4*b1*c3*d2
-        - a4*b2*c3*d1 + a4*b2*c1*d3 - a4*b3*c1*d2 + a4*b3*c2*d1;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::Inverse() {
-    // Compute the reciprocal determinant
-    const TReal det = Determinant();
-    if(det == static_cast<TReal>(0.0))
-    {
-        // Matrix not invertible. Setting all elements to nan is not really
-        // correct in a mathematical sense but it is easy to debug for the
-        // programmer.
-        const TReal nan = std::numeric_limits<TReal>::quiet_NaN();
-        *this = aiMatrix4x4t<TReal>(
-            nan,nan,nan,nan,
-            nan,nan,nan,nan,
-            nan,nan,nan,nan,
-            nan,nan,nan,nan);
-
-        return *this;
-    }
-
-    const TReal invdet = static_cast<TReal>(1.0) / det;
-
-    aiMatrix4x4t<TReal> res;
-    res.a1 = invdet  * (b2 * (c3 * d4 - c4 * d3) + b3 * (c4 * d2 - c2 * d4) + b4 * (c2 * d3 - c3 * d2));
-    res.a2 = -invdet * (a2 * (c3 * d4 - c4 * d3) + a3 * (c4 * d2 - c2 * d4) + a4 * (c2 * d3 - c3 * d2));
-    res.a3 = invdet  * (a2 * (b3 * d4 - b4 * d3) + a3 * (b4 * d2 - b2 * d4) + a4 * (b2 * d3 - b3 * d2));
-    res.a4 = -invdet * (a2 * (b3 * c4 - b4 * c3) + a3 * (b4 * c2 - b2 * c4) + a4 * (b2 * c3 - b3 * c2));
-    res.b1 = -invdet * (b1 * (c3 * d4 - c4 * d3) + b3 * (c4 * d1 - c1 * d4) + b4 * (c1 * d3 - c3 * d1));
-    res.b2 = invdet  * (a1 * (c3 * d4 - c4 * d3) + a3 * (c4 * d1 - c1 * d4) + a4 * (c1 * d3 - c3 * d1));
-    res.b3 = -invdet * (a1 * (b3 * d4 - b4 * d3) + a3 * (b4 * d1 - b1 * d4) + a4 * (b1 * d3 - b3 * d1));
-    res.b4 = invdet  * (a1 * (b3 * c4 - b4 * c3) + a3 * (b4 * c1 - b1 * c4) + a4 * (b1 * c3 - b3 * c1));
-    res.c1 = invdet  * (b1 * (c2 * d4 - c4 * d2) + b2 * (c4 * d1 - c1 * d4) + b4 * (c1 * d2 - c2 * d1));
-    res.c2 = -invdet * (a1 * (c2 * d4 - c4 * d2) + a2 * (c4 * d1 - c1 * d4) + a4 * (c1 * d2 - c2 * d1));
-    res.c3 = invdet  * (a1 * (b2 * d4 - b4 * d2) + a2 * (b4 * d1 - b1 * d4) + a4 * (b1 * d2 - b2 * d1));
-    res.c4 = -invdet * (a1 * (b2 * c4 - b4 * c2) + a2 * (b4 * c1 - b1 * c4) + a4 * (b1 * c2 - b2 * c1));
-    res.d1 = -invdet * (b1 * (c2 * d3 - c3 * d2) + b2 * (c3 * d1 - c1 * d3) + b3 * (c1 * d2 - c2 * d1));
-    res.d2 = invdet  * (a1 * (c2 * d3 - c3 * d2) + a2 * (c3 * d1 - c1 * d3) + a3 * (c1 * d2 - c2 * d1));
-    res.d3 = -invdet * (a1 * (b2 * d3 - b3 * d2) + a2 * (b3 * d1 - b1 * d3) + a3 * (b1 * d2 - b2 * d1));
-    res.d4 = invdet  * (a1 * (b2 * c3 - b3 * c2) + a2 * (b3 * c1 - b1 * c3) + a3 * (b1 * c2 - b2 * c1));
-    *this = res;
-
-    return *this;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal* aiMatrix4x4t<TReal>::operator[](unsigned int p_iIndex) {
-    if (p_iIndex > 3) {
-        return nullptr;
-    }
-    switch ( p_iIndex ) {
-        case 0:
-            return &a1;
-        case 1:
-            return &b1;
-        case 2:
-            return &c1;
-        case 3:
-            return &d1;
-        default:
-            break;
-    }
-    return &a1;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const TReal* aiMatrix4x4t<TReal>::operator[](unsigned int p_iIndex) const {
-    if (p_iIndex > 3) {
-        return nullptr;
-    }
-
-    switch ( p_iIndex ) {
-        case 0:
-            return &a1;
-        case 1:
-            return &b1;
-        case 2:
-            return &c1;
-        case 3:
-            return &d1;
-        default:
-            break;
-    }
-    return &a1;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiMatrix4x4t<TReal>::operator== (const aiMatrix4x4t<TReal>& m) const {
-    return (a1 == m.a1 && a2 == m.a2 && a3 == m.a3 && a4 == m.a4 &&
-            b1 == m.b1 && b2 == m.b2 && b3 == m.b3 && b4 == m.b4 &&
-            c1 == m.c1 && c2 == m.c2 && c3 == m.c3 && c4 == m.c4 &&
-            d1 == m.d1 && d2 == m.d2 && d3 == m.d3 && d4 == m.d4);
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiMatrix4x4t<TReal>::operator!= (const aiMatrix4x4t<TReal>& m) const {
-    return !(*this == m);
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-AI_FORCE_INLINE
-bool aiMatrix4x4t<TReal>::Equal(const aiMatrix4x4t<TReal>& m, TReal epsilon) const {
-    return
-        std::abs(a1 - m.a1) <= epsilon &&
-        std::abs(a2 - m.a2) <= epsilon &&
-        std::abs(a3 - m.a3) <= epsilon &&
-        std::abs(a4 - m.a4) <= epsilon &&
-        std::abs(b1 - m.b1) <= epsilon &&
-        std::abs(b2 - m.b2) <= epsilon &&
-        std::abs(b3 - m.b3) <= epsilon &&
-        std::abs(b4 - m.b4) <= epsilon &&
-        std::abs(c1 - m.c1) <= epsilon &&
-        std::abs(c2 - m.c2) <= epsilon &&
-        std::abs(c3 - m.c3) <= epsilon &&
-        std::abs(c4 - m.c4) <= epsilon &&
-        std::abs(d1 - m.d1) <= epsilon &&
-        std::abs(d2 - m.d2) <= epsilon &&
-        std::abs(d3 - m.d3) <= epsilon &&
-        std::abs(d4 - m.d4) <= epsilon;
-}
-
-// ----------------------------------------------------------------------------------------
-
-#define ASSIMP_MATRIX4_4_DECOMPOSE_PART		\
-	const aiMatrix4x4t<TReal>& _this = *this;/* Create alias for conveniance. */ \
-	\
-	/* extract translation */ \
-	pPosition.x = _this[0][3]; \
-	pPosition.y = _this[1][3]; \
-	pPosition.z = _this[2][3]; \
-	\
-	/* extract the columns of the matrix. */ \
-	aiVector3t<TReal> vCols[3] = { \
-		aiVector3t<TReal>(_this[0][0],_this[1][0],_this[2][0]), \
-		aiVector3t<TReal>(_this[0][1],_this[1][1],_this[2][1]), \
-		aiVector3t<TReal>(_this[0][2],_this[1][2],_this[2][2]) \
-	}; \
-	\
-	/* extract the scaling factors */ \
-	pScaling.x = vCols[0].Length(); \
-	pScaling.y = vCols[1].Length(); \
-	pScaling.z = vCols[2].Length(); \
-	\
-	/* and the sign of the scaling */ \
-	if (Determinant() < 0) pScaling = -pScaling; \
-	\
-	/* and remove all scaling from the matrix */ \
-	if(pScaling.x) vCols[0] /= pScaling.x; \
-	if(pScaling.y) vCols[1] /= pScaling.y; \
-	if(pScaling.z) vCols[2] /= pScaling.z; \
-	\
-	do {} while(false)
-
-template <typename TReal>
-AI_FORCE_INLINE
-void aiMatrix4x4t<TReal>::Decompose (aiVector3t<TReal>& pScaling, aiQuaterniont<TReal>& pRotation,
-        aiVector3t<TReal>& pPosition) const {
-	ASSIMP_MATRIX4_4_DECOMPOSE_PART;
-
-    // build a 3x3 rotation matrix
-    aiMatrix3x3t<TReal> m(vCols[0].x,vCols[1].x,vCols[2].x,
-        vCols[0].y,vCols[1].y,vCols[2].y,
-        vCols[0].z,vCols[1].z,vCols[2].z);
-
-    // and generate the rotation quaternion from it
-    pRotation = aiQuaterniont<TReal>(m);
-}
-
-template <typename TReal>
-AI_FORCE_INLINE
-void aiMatrix4x4t<TReal>::Decompose(aiVector3t<TReal>& pScaling, aiVector3t<TReal>& pRotation, aiVector3t<TReal>& pPosition) const {
-	ASSIMP_MATRIX4_4_DECOMPOSE_PART;
-
-    /*
-    assuming a right-handed coordinate system
-    and post-multiplication of column vectors,
-    the rotation matrix for an euler XYZ rotation is M = Rz * Ry * Rx.
-    combining gives:
-    
-        |  CE  BDE-AF  ADE+BF  0  |
-    M = |  CF  BDF+AE  ADF-BE  0  |
-        |  -D    CB      AC    0  |
-        |   0     0       0    1  |
-
-    where
-	A = cos(angle_x), B = sin(angle_x);
-	C = cos(angle_y), D = sin(angle_y);
-	E = cos(angle_z), F = sin(angle_z);
-	*/
-
-	// Use a small epsilon to solve floating-point inaccuracies
-    const TReal epsilon = Assimp::Math::getEpsilon<TReal>();
-
-	pRotation.y  = std::asin(-vCols[0].z);// D. Angle around oY.
-
-	TReal C = std::cos(pRotation.y);
-
-	if(std::fabs(C) > epsilon)
-	{
-		// Finding angle around oX.
-		TReal tan_x = vCols[2].z / C;// A
-		TReal tan_y = vCols[1].z / C;// B
-
-		pRotation.x = std::atan2(tan_y, tan_x);
-		// Finding angle around oZ.
-		tan_x = vCols[0].x / C;// E
-		tan_y = vCols[0].y / C;// F
-		pRotation.z = std::atan2(tan_y, tan_x);
-	}
-	else
-	{// oY is fixed.
-		pRotation.x = 0;// Set angle around oX to 0. => A == 1, B == 0, C == 0, D == 1.
-
-		// And finding angle around oZ.
-		TReal tan_x =  vCols[1].y;// BDF+AE => E
-		TReal tan_y = -vCols[1].x;// BDE-AF => F
-
-		pRotation.z = std::atan2(tan_y, tan_x);
-	}
-}
-
-#undef ASSIMP_MATRIX4_4_DECOMPOSE_PART
-
-template <typename TReal>
-AI_FORCE_INLINE
-void aiMatrix4x4t<TReal>::Decompose(aiVector3t<TReal>& pScaling, aiVector3t<TReal>& pRotationAxis, TReal& pRotationAngle,
-											aiVector3t<TReal>& pPosition) const {
-    aiQuaterniont<TReal> pRotation;
-
-	Decompose(pScaling, pRotation, pPosition);
-	pRotation.Normalize();
-
-	TReal angle_cos = pRotation.w;
-	TReal angle_sin = std::sqrt(1.0f - angle_cos * angle_cos);
-
-	pRotationAngle = std::acos(angle_cos) * 2;
-
-	// Use a small epsilon to solve floating-point inaccuracies
-    const TReal epsilon = 10e-3f;
-
-	if(std::fabs(angle_sin) < epsilon) angle_sin = 1;
-
-	pRotationAxis.x = pRotation.x / angle_sin;
-	pRotationAxis.y = pRotation.y / angle_sin;
-	pRotationAxis.z = pRotation.z / angle_sin;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-void aiMatrix4x4t<TReal>::DecomposeNoScaling (aiQuaterniont<TReal>& rotation,
-        aiVector3t<TReal>& position) const {
-    const aiMatrix4x4t<TReal>& _this = *this;
-
-    // extract translation
-    position.x = _this[0][3];
-    position.y = _this[1][3];
-    position.z = _this[2][3];
-
-    // extract rotation
-    rotation = aiQuaterniont<TReal>((aiMatrix3x3t<TReal>)_this);
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::FromEulerAnglesXYZ(const aiVector3t<TReal>& blubb) {
-    return FromEulerAnglesXYZ(blubb.x,blubb.y,blubb.z);
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::FromEulerAnglesXYZ(TReal x, TReal y, TReal z) {
-    aiMatrix4x4t<TReal>& _this = *this;
-
-    TReal cx = std::cos(x);
-    TReal sx = std::sin(x);
-    TReal cy = std::cos(y);
-    TReal sy = std::sin(y);
-    TReal cz = std::cos(z);
-    TReal sz = std::sin(z);
-
-    // mz*my*mx
-    _this.a1 = cz * cy;
-    _this.a2 = cz * sy * sx - sz * cx;
-    _this.a3 = sz * sx + cz * sy * cx;
-
-    _this.b1 = sz * cy;
-    _this.b2 = cz * cx + sz * sy * sx;
-    _this.b3 = sz * sy * cx - cz * sx;
-
-    _this.c1 = -sy;
-    _this.c2 = cy * sx;
-    _this.c3 = cy * cx;
-
-    return *this;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiMatrix4x4t<TReal>::IsIdentity() const {
-    // Use a small epsilon to solve floating-point inaccuracies
-    const static TReal epsilon = 10e-3f;
-
-    return (a2 <= epsilon && a2 >= -epsilon &&
-            a3 <= epsilon && a3 >= -epsilon &&
-            a4 <= epsilon && a4 >= -epsilon &&
-            b1 <= epsilon && b1 >= -epsilon &&
-            b3 <= epsilon && b3 >= -epsilon &&
-            b4 <= epsilon && b4 >= -epsilon &&
-            c1 <= epsilon && c1 >= -epsilon &&
-            c2 <= epsilon && c2 >= -epsilon &&
-            c4 <= epsilon && c4 >= -epsilon &&
-            d1 <= epsilon && d1 >= -epsilon &&
-            d2 <= epsilon && d2 >= -epsilon &&
-            d3 <= epsilon && d3 >= -epsilon &&
-            a1 <= 1.f+epsilon && a1 >= 1.f-epsilon &&
-            b2 <= 1.f+epsilon && b2 >= 1.f-epsilon &&
-            c3 <= 1.f+epsilon && c3 >= 1.f-epsilon &&
-            d4 <= 1.f+epsilon && d4 >= 1.f-epsilon);
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::RotationX(TReal a, aiMatrix4x4t<TReal>& out) {
-    /*
-         |  1  0       0       0 |
-     M = |  0  cos(A) -sin(A)  0 |
-         |  0  sin(A)  cos(A)  0 |
-         |  0  0       0       1 |  */
-    out = aiMatrix4x4t<TReal>();
-    out.b2 = out.c3 = std::cos(a);
-    out.b3 = -(out.c2 = std::sin(a));
-    return out;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::RotationY(TReal a, aiMatrix4x4t<TReal>& out) {
-    /*
-         |  cos(A)  0   sin(A)  0 |
-     M = |  0       1   0       0 |
-         | -sin(A)  0   cos(A)  0 |
-         |  0       0   0       1 |
-        */
-    out = aiMatrix4x4t<TReal>();
-    out.a1 = out.c3 = std::cos(a);
-    out.c1 = -(out.a3 = std::sin(a));
-    return out;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::RotationZ(TReal a, aiMatrix4x4t<TReal>& out) {
-    /*
-         |  cos(A)  -sin(A)   0   0 |
-     M = |  sin(A)   cos(A)   0   0 |
-         |  0        0        1   0 |
-         |  0        0        0   1 |   */
-    out = aiMatrix4x4t<TReal>();
-    out.a1 = out.b2 = std::cos(a);
-    out.a2 = -(out.b1 = std::sin(a));
-    return out;
-}
-
-// ----------------------------------------------------------------------------------------
-// Returns a rotation matrix for a rotation around an arbitrary axis.
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::Rotation( TReal a, const aiVector3t<TReal>& axis, aiMatrix4x4t<TReal>& out) {
-    TReal c = std::cos( a), s = std::sin( a), t = 1 - c;
-    TReal x = axis.x, y = axis.y, z = axis.z;
-
-    // Many thanks to MathWorld and Wikipedia
-    out.a1 = t*x*x + c;   out.a2 = t*x*y - s*z; out.a3 = t*x*z + s*y;
-    out.b1 = t*x*y + s*z; out.b2 = t*y*y + c;   out.b3 = t*y*z - s*x;
-    out.c1 = t*x*z - s*y; out.c2 = t*y*z + s*x; out.c3 = t*z*z + c;
-    out.a4 = out.b4 = out.c4 = static_cast<TReal>(0.0);
-    out.d1 = out.d2 = out.d3 = static_cast<TReal>(0.0);
-    out.d4 = static_cast<TReal>(1.0);
-
-    return out;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::Translation( const aiVector3t<TReal>& v, aiMatrix4x4t<TReal>& out) {
-    out = aiMatrix4x4t<TReal>();
-    out.a4 = v.x;
-    out.b4 = v.y;
-    out.c4 = v.z;
-    return out;
-}
-
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::Scaling( const aiVector3t<TReal>& v, aiMatrix4x4t<TReal>& out) {
-    out = aiMatrix4x4t<TReal>();
-    out.a1 = v.x;
-    out.b2 = v.y;
-    out.c3 = v.z;
-    return out;
-}
-
-// ----------------------------------------------------------------------------------------
-/** A function for creating a rotation matrix that rotates a vector called
- * "from" into another vector called "to".
- * Input : from[3], to[3] which both must be *normalized* non-zero vectors
- * Output: mtx[3][3] -- a 3x3 matrix in colum-major form
- * Authors: Tomas Möller, John Hughes
- *          "Efficiently Building a Matrix to Rotate One Vector to Another"
- *          Journal of Graphics Tools, 4(4):1-4, 1999
- */
-// ----------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiMatrix4x4t<TReal>& aiMatrix4x4t<TReal>::FromToMatrix(const aiVector3t<TReal>& from,
-        const aiVector3t<TReal>& to, aiMatrix4x4t<TReal>& mtx) {
-    aiMatrix3x3t<TReal> m3;
-    aiMatrix3x3t<TReal>::FromToMatrix(from,to,m3);
-    mtx = aiMatrix4x4t<TReal>(m3);
-    return mtx;
-}
-
-#endif // __cplusplus
-#endif // AI_MATRIX4X4_INL_INC
diff --git a/thirdparty/assimp/include/assimp/mesh.h b/thirdparty/assimp/include/assimp/mesh.h
deleted file mode 100644
index fbf2a857ad..0000000000
--- a/thirdparty/assimp/include/assimp/mesh.h
+++ /dev/null
@@ -1,879 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file mesh.h
- *  @brief Declares the data structures in which the imported geometry is
-    returned by ASSIMP: aiMesh, aiFace and aiBone data structures.
- */
-#pragma once
-#ifndef AI_MESH_H_INC
-#define AI_MESH_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-#include <assimp/aabb.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-// Limits. These values are required to match the settings Assimp was
-// compiled against. Therefore, do not redefine them unless you build the
-// library from source using the same definitions.
-// ---------------------------------------------------------------------------
-
-/** @def AI_MAX_FACE_INDICES
- *  Maximum number of indices per face (polygon). */
-
-#ifndef AI_MAX_FACE_INDICES
-#   define AI_MAX_FACE_INDICES 0x7fff
-#endif
-
-/** @def AI_MAX_BONE_WEIGHTS
- *  Maximum number of indices per face (polygon). */
-
-#ifndef AI_MAX_BONE_WEIGHTS
-#   define AI_MAX_BONE_WEIGHTS 0x7fffffff
-#endif
-
-/** @def AI_MAX_VERTICES
- *  Maximum number of vertices per mesh.  */
-
-#ifndef AI_MAX_VERTICES
-#   define AI_MAX_VERTICES 0x7fffffff
-#endif
-
-/** @def AI_MAX_FACES
- *  Maximum number of faces per mesh. */
-
-#ifndef AI_MAX_FACES
-#   define AI_MAX_FACES 0x7fffffff
-#endif
-
-/** @def AI_MAX_NUMBER_OF_COLOR_SETS
- *  Supported number of vertex color sets per mesh. */
-
-#ifndef AI_MAX_NUMBER_OF_COLOR_SETS
-#   define AI_MAX_NUMBER_OF_COLOR_SETS 0x8
-#endif // !! AI_MAX_NUMBER_OF_COLOR_SETS
-
-/** @def AI_MAX_NUMBER_OF_TEXTURECOORDS
- *  Supported number of texture coord sets (UV(W) channels) per mesh */
-
-#ifndef AI_MAX_NUMBER_OF_TEXTURECOORDS
-#   define AI_MAX_NUMBER_OF_TEXTURECOORDS 0x8
-#endif // !! AI_MAX_NUMBER_OF_TEXTURECOORDS
-
-// ---------------------------------------------------------------------------
-/** @brief A single face in a mesh, referring to multiple vertices.
- *
- * If mNumIndices is 3, we call the face 'triangle', for mNumIndices > 3
- * it's called 'polygon' (hey, that's just a definition!).
- * <br>
- * aiMesh::mPrimitiveTypes can be queried to quickly examine which types of
- * primitive are actually present in a mesh. The #aiProcess_SortByPType flag
- * executes a special post-processing algorithm which splits meshes with
- * *different* primitive types mixed up (e.g. lines and triangles) in several
- * 'clean' submeshes. Furthermore there is a configuration option (
- * #AI_CONFIG_PP_SBP_REMOVE) to force #aiProcess_SortByPType to remove
- * specific kinds of primitives from the imported scene, completely and forever.
- * In many cases you'll probably want to set this setting to
- * @code
- * aiPrimitiveType_LINE|aiPrimitiveType_POINT
- * @endcode
- * Together with the #aiProcess_Triangulate flag you can then be sure that
- * #aiFace::mNumIndices is always 3.
- * @note Take a look at the @link data Data Structures page @endlink for
- * more information on the layout and winding order of a face.
- */
-struct aiFace
-{
-    //! Number of indices defining this face.
-    //! The maximum value for this member is #AI_MAX_FACE_INDICES.
-    unsigned int mNumIndices;
-
-    //! Pointer to the indices array. Size of the array is given in numIndices.
-    unsigned int* mIndices;
-
-#ifdef __cplusplus
-
-    //! Default constructor
-    aiFace() AI_NO_EXCEPT
-    : mNumIndices( 0 )
-    , mIndices( nullptr ) {
-        // empty
-    }
-
-    //! Default destructor. Delete the index array
-    ~aiFace()
-    {
-        delete [] mIndices;
-    }
-
-    //! Copy constructor. Copy the index array
-    aiFace( const aiFace& o)
-    : mNumIndices(0)
-    , mIndices( nullptr ) {
-        *this = o;
-    }
-
-    //! Assignment operator. Copy the index array
-    aiFace& operator = ( const aiFace& o) {
-        if (&o == this) {
-            return *this;
-        }
-
-        delete[] mIndices;
-        mNumIndices = o.mNumIndices;
-        if (mNumIndices) {
-            mIndices = new unsigned int[mNumIndices];
-            ::memcpy( mIndices, o.mIndices, mNumIndices * sizeof( unsigned int));
-        } else {
-            mIndices = nullptr;
-        }
-
-        return *this;
-    }
-
-    //! Comparison operator. Checks whether the index array
-    //! of two faces is identical
-    bool operator== (const aiFace& o) const {
-        if (mIndices == o.mIndices) {
-            return true;
-        }
-
-        if (nullptr != mIndices && mNumIndices != o.mNumIndices) {
-            return false;
-        }
-
-        if (nullptr == mIndices) {
-            return false;
-        }
-
-        for (unsigned int i = 0; i < this->mNumIndices; ++i) {
-            if (mIndices[i] != o.mIndices[i]) {
-                return false;
-            }
-        }
-
-        return true;
-    }
-
-    //! Inverse comparison operator. Checks whether the index
-    //! array of two faces is NOT identical
-    bool operator != (const aiFace& o) const {
-        return !(*this == o);
-    }
-#endif // __cplusplus
-}; // struct aiFace
-
-
-// ---------------------------------------------------------------------------
-/** @brief A single influence of a bone on a vertex.
- */
-struct aiVertexWeight {
-    //! Index of the vertex which is influenced by the bone.
-    unsigned int mVertexId;
-
-    //! The strength of the influence in the range (0...1).
-    //! The influence from all bones at one vertex amounts to 1.
-    float mWeight;
-
-#ifdef __cplusplus
-
-    //! Default constructor
-    aiVertexWeight() AI_NO_EXCEPT
-    : mVertexId(0)
-    , mWeight(0.0f) {
-        // empty
-    }
-
-    //! Initialization from a given index and vertex weight factor
-    //! \param pID ID
-    //! \param pWeight Vertex weight factor
-    aiVertexWeight( unsigned int pID, float pWeight )
-    : mVertexId( pID )
-    , mWeight( pWeight ) {
-        // empty
-    }
-
-    bool operator == ( const aiVertexWeight &rhs ) const {
-        return ( mVertexId == rhs.mVertexId && mWeight == rhs.mWeight );
-    }
-
-    bool operator != ( const aiVertexWeight &rhs ) const {
-        return ( *this == rhs );
-    }
-
-#endif // __cplusplus
-};
-
-
-// Forward declare aiNode (pointer use only)
-struct aiNode;
-
-// ---------------------------------------------------------------------------
-/** @brief A single bone of a mesh.
- *
- *  A bone has a name by which it can be found in the frame hierarchy and by
- *  which it can be addressed by animations. In addition it has a number of
- *  influences on vertices, and a matrix relating the mesh position to the
- *  position of the bone at the time of binding.
- */
-struct aiBone {
-    //! The name of the bone.
-    C_STRUCT aiString mName;
-
-    //! The number of vertices affected by this bone.
-    //! The maximum value for this member is #AI_MAX_BONE_WEIGHTS.
-    unsigned int mNumWeights;
-
-#ifndef ASSIMP_BUILD_NO_ARMATUREPOPULATE_PROCESS
-    // The bone armature node - used for skeleton conversion
-    // you must enable aiProcess_PopulateArmatureData to populate this
-    C_STRUCT aiNode* mArmature;
-
-    // The bone node in the scene - used for skeleton conversion
-    // you must enable aiProcess_PopulateArmatureData to populate this
-    C_STRUCT aiNode* mNode;
-
-#endif
-    //! The influence weights of this bone, by vertex index.
-    C_STRUCT aiVertexWeight* mWeights;
-
-    /** Matrix that transforms from bone space to mesh space in bind pose.
-     *
-     * This matrix describes the position of the mesh
-     * in the local space of this bone when the skeleton was bound.
-     * Thus it can be used directly to determine a desired vertex position,
-     * given the world-space transform of the bone when animated,
-     * and the position of the vertex in mesh space.
-     *
-     * It is sometimes called an inverse-bind matrix,
-     * or inverse bind pose matrix.
-     */
-    C_STRUCT aiMatrix4x4 mOffsetMatrix;
-
-#ifdef __cplusplus
-
-    //! Default constructor
-    aiBone() AI_NO_EXCEPT
-    : mName()
-    , mNumWeights( 0 )
-    , mWeights( nullptr )
-    , mOffsetMatrix() {
-        // empty
-    }
-
-    //! Copy constructor
-    aiBone(const aiBone& other)
-    : mName( other.mName )
-    , mNumWeights( other.mNumWeights )
-    , mWeights(nullptr)
-    , mOffsetMatrix( other.mOffsetMatrix ) {
-        if (other.mWeights && other.mNumWeights) {
-            mWeights = new aiVertexWeight[mNumWeights];
-            ::memcpy(mWeights,other.mWeights,mNumWeights * sizeof(aiVertexWeight));
-        }
-    }
-
-
-    //! Assignment operator
-    aiBone &operator=(const aiBone& other) {
-        if (this == &other) {
-            return *this;
-        }
-
-        mName         = other.mName;
-        mNumWeights   = other.mNumWeights;
-        mOffsetMatrix = other.mOffsetMatrix;
-
-        if (other.mWeights && other.mNumWeights)
-        {
-            if (mWeights) {
-                delete[] mWeights;
-            }
-
-            mWeights = new aiVertexWeight[mNumWeights];
-            ::memcpy(mWeights,other.mWeights,mNumWeights * sizeof(aiVertexWeight));
-        }
-
-        return *this;
-    }
-
-    bool operator == ( const aiBone &rhs ) const {
-        if ( mName != rhs.mName || mNumWeights != rhs.mNumWeights ) {
-            return false;
-        }
-
-        for ( size_t i = 0; i < mNumWeights; ++i ) {
-            if ( mWeights[ i ] != rhs.mWeights[ i ] ) {
-                return false;
-            }
-        }
-
-        return true;
-    }
-    //! Destructor - deletes the array of vertex weights
-    ~aiBone() {
-        delete [] mWeights;
-    }
-#endif // __cplusplus
-};
-
-
-// ---------------------------------------------------------------------------
-/** @brief Enumerates the types of geometric primitives supported by Assimp.
- *
- *  @see aiFace Face data structure
- *  @see aiProcess_SortByPType Per-primitive sorting of meshes
- *  @see aiProcess_Triangulate Automatic triangulation
- *  @see AI_CONFIG_PP_SBP_REMOVE Removal of specific primitive types.
- */
-enum aiPrimitiveType
-{
-    /** A point primitive.
-     *
-     * This is just a single vertex in the virtual world,
-     * #aiFace contains just one index for such a primitive.
-     */
-    aiPrimitiveType_POINT       = 0x1,
-
-    /** A line primitive.
-     *
-     * This is a line defined through a start and an end position.
-     * #aiFace contains exactly two indices for such a primitive.
-     */
-    aiPrimitiveType_LINE        = 0x2,
-
-    /** A triangular primitive.
-     *
-     * A triangle consists of three indices.
-     */
-    aiPrimitiveType_TRIANGLE    = 0x4,
-
-    /** A higher-level polygon with more than 3 edges.
-     *
-     * A triangle is a polygon, but polygon in this context means
-     * "all polygons that are not triangles". The "Triangulate"-Step
-     * is provided for your convenience, it splits all polygons in
-     * triangles (which are much easier to handle).
-     */
-    aiPrimitiveType_POLYGON     = 0x8,
-
-
-    /** This value is not used. It is just here to force the
-     *  compiler to map this enum to a 32 Bit integer.
-     */
-#ifndef SWIG
-    _aiPrimitiveType_Force32Bit = INT_MAX
-#endif
-}; //! enum aiPrimitiveType
-
-// Get the #aiPrimitiveType flag for a specific number of face indices
-#define AI_PRIMITIVE_TYPE_FOR_N_INDICES(n) \
-    ((n) > 3 ? aiPrimitiveType_POLYGON : (aiPrimitiveType)(1u << ((n)-1)))
-
-
-
-// ---------------------------------------------------------------------------
-/** @brief An AnimMesh is an attachment to an #aiMesh stores per-vertex
- *  animations for a particular frame.
- *
- *  You may think of an #aiAnimMesh as a `patch` for the host mesh, which
- *  replaces only certain vertex data streams at a particular time.
- *  Each mesh stores n attached attached meshes (#aiMesh::mAnimMeshes).
- *  The actual relationship between the time line and anim meshes is
- *  established by #aiMeshAnim, which references singular mesh attachments
- *  by their ID and binds them to a time offset.
-*/
-struct aiAnimMesh
-{
-    /**Anim Mesh name */
-    C_STRUCT aiString mName;
-
-    /** Replacement for aiMesh::mVertices. If this array is non-nullptr,
-     *  it *must* contain mNumVertices entries. The corresponding
-     *  array in the host mesh must be non-nullptr as well - animation
-     *  meshes may neither add or nor remove vertex components (if
-     *  a replacement array is nullptr and the corresponding source
-     *  array is not, the source data is taken instead)*/
-    C_STRUCT aiVector3D* mVertices;
-
-    /** Replacement for aiMesh::mNormals.  */
-    C_STRUCT aiVector3D* mNormals;
-
-    /** Replacement for aiMesh::mTangents. */
-    C_STRUCT aiVector3D* mTangents;
-
-    /** Replacement for aiMesh::mBitangents. */
-    C_STRUCT aiVector3D* mBitangents;
-
-    /** Replacement for aiMesh::mColors */
-    C_STRUCT aiColor4D* mColors[AI_MAX_NUMBER_OF_COLOR_SETS];
-
-    /** Replacement for aiMesh::mTextureCoords */
-    C_STRUCT aiVector3D* mTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
-
-    /** The number of vertices in the aiAnimMesh, and thus the length of all
-     * the member arrays.
-     *
-     * This has always the same value as the mNumVertices property in the
-     * corresponding aiMesh. It is duplicated here merely to make the length
-     * of the member arrays accessible even if the aiMesh is not known, e.g.
-     * from language bindings.
-     */
-    unsigned int mNumVertices;
-    
-    /** 
-     * Weight of the AnimMesh. 
-     */
-    float mWeight;
-
-#ifdef __cplusplus
-
-    aiAnimMesh() AI_NO_EXCEPT
-        : mVertices( nullptr )
-        , mNormals(nullptr)
-        , mTangents(nullptr)
-        , mBitangents(nullptr)
-        , mColors()
-        , mTextureCoords()
-        , mNumVertices( 0 )
-        , mWeight( 0.0f )
-    {
-        // fixme consider moving this to the ctor initializer list as well
-        for( unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++){
-            mTextureCoords[a] = nullptr;
-        }
-        for( unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++) {
-            mColors[a] = nullptr;
-        }
-    }
-
-    ~aiAnimMesh()
-    {
-        delete [] mVertices;
-        delete [] mNormals;
-        delete [] mTangents;
-        delete [] mBitangents;
-        for( unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++) {
-            delete [] mTextureCoords[a];
-        }
-        for( unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++) {
-            delete [] mColors[a];
-        }
-    }
-
-    /** Check whether the anim mesh overrides the vertex positions
-     *  of its host mesh*/
-    bool HasPositions() const {
-        return mVertices != nullptr;
-    }
-
-    /** Check whether the anim mesh overrides the vertex normals
-     *  of its host mesh*/
-    bool HasNormals() const {
-        return mNormals != nullptr;
-    }
-
-    /** Check whether the anim mesh overrides the vertex tangents
-     *  and bitangents of its host mesh. As for aiMesh,
-     *  tangents and bitangents always go together. */
-    bool HasTangentsAndBitangents() const {
-        return mTangents != nullptr;
-    }
-
-    /** Check whether the anim mesh overrides a particular
-     * set of vertex colors on his host mesh.
-     *  @param pIndex 0<index<AI_MAX_NUMBER_OF_COLOR_SETS */
-    bool HasVertexColors( unsigned int pIndex) const    {
-        return pIndex >= AI_MAX_NUMBER_OF_COLOR_SETS ? false : mColors[pIndex] != nullptr;
-    }
-
-    /** Check whether the anim mesh overrides a particular
-     * set of texture coordinates on his host mesh.
-     *  @param pIndex 0<index<AI_MAX_NUMBER_OF_TEXTURECOORDS */
-    bool HasTextureCoords( unsigned int pIndex) const   {
-        return pIndex >= AI_MAX_NUMBER_OF_TEXTURECOORDS ? false : mTextureCoords[pIndex] != nullptr;
-    }
-
-#endif
-};
-
-// ---------------------------------------------------------------------------
-/** @brief Enumerates the methods of mesh morphing supported by Assimp.
- */
-enum aiMorphingMethod
-{
-    /** Interpolation between morph targets */
-    aiMorphingMethod_VERTEX_BLEND       = 0x1,
-
-    /** Normalized morphing between morph targets  */
-    aiMorphingMethod_MORPH_NORMALIZED   = 0x2,
-
-    /** Relative morphing between morph targets  */
-    aiMorphingMethod_MORPH_RELATIVE     = 0x3,
-
-    /** This value is not used. It is just here to force the
-     *  compiler to map this enum to a 32 Bit integer.
-     */
-#ifndef SWIG
-    _aiMorphingMethod_Force32Bit = INT_MAX
-#endif
-}; //! enum aiMorphingMethod
-
-// ---------------------------------------------------------------------------
-/** @brief A mesh represents a geometry or model with a single material.
-*
-* It usually consists of a number of vertices and a series of primitives/faces
-* referencing the vertices. In addition there might be a series of bones, each
-* of them addressing a number of vertices with a certain weight. Vertex data
-* is presented in channels with each channel containing a single per-vertex
-* information such as a set of texture coords or a normal vector.
-* If a data pointer is non-null, the corresponding data stream is present.
-* From C++-programs you can also use the comfort functions Has*() to
-* test for the presence of various data streams.
-*
-* A Mesh uses only a single material which is referenced by a material ID.
-* @note The mPositions member is usually not optional. However, vertex positions
-* *could* be missing if the #AI_SCENE_FLAGS_INCOMPLETE flag is set in
-* @code
-* aiScene::mFlags
-* @endcode
-*/
-struct aiMesh
-{
-    /** Bitwise combination of the members of the #aiPrimitiveType enum.
-     * This specifies which types of primitives are present in the mesh.
-     * The "SortByPrimitiveType"-Step can be used to make sure the
-     * output meshes consist of one primitive type each.
-     */
-    unsigned int mPrimitiveTypes;
-
-    /** The number of vertices in this mesh.
-    * This is also the size of all of the per-vertex data arrays.
-    * The maximum value for this member is #AI_MAX_VERTICES.
-    */
-    unsigned int mNumVertices;
-
-    /** The number of primitives (triangles, polygons, lines) in this  mesh.
-    * This is also the size of the mFaces array.
-    * The maximum value for this member is #AI_MAX_FACES.
-    */
-    unsigned int mNumFaces;
-
-    /** Vertex positions.
-    * This array is always present in a mesh. The array is
-    * mNumVertices in size.
-    */
-    C_STRUCT aiVector3D* mVertices;
-
-    /** Vertex normals.
-    * The array contains normalized vectors, nullptr if not present.
-    * The array is mNumVertices in size. Normals are undefined for
-    * point and line primitives. A mesh consisting of points and
-    * lines only may not have normal vectors. Meshes with mixed
-    * primitive types (i.e. lines and triangles) may have normals,
-    * but the normals for vertices that are only referenced by
-    * point or line primitives are undefined and set to QNaN (WARN:
-    * qNaN compares to inequal to *everything*, even to qNaN itself.
-    * Using code like this to check whether a field is qnan is:
-    * @code
-    * #define IS_QNAN(f) (f != f)
-    * @endcode
-    * still dangerous because even 1.f == 1.f could evaluate to false! (
-    * remember the subtleties of IEEE754 artithmetics). Use stuff like
-    * @c fpclassify instead.
-    * @note Normal vectors computed by Assimp are always unit-length.
-    * However, this needn't apply for normals that have been taken
-    *   directly from the model file.
-    */
-    C_STRUCT aiVector3D* mNormals;
-
-    /** Vertex tangents.
-    * The tangent of a vertex points in the direction of the positive
-    * X texture axis. The array contains normalized vectors, nullptr if
-    * not present. The array is mNumVertices in size. A mesh consisting
-    * of points and lines only may not have normal vectors. Meshes with
-    * mixed primitive types (i.e. lines and triangles) may have
-    * normals, but the normals for vertices that are only referenced by
-    * point or line primitives are undefined and set to qNaN.  See
-    * the #mNormals member for a detailed discussion of qNaNs.
-    * @note If the mesh contains tangents, it automatically also
-    * contains bitangents.
-    */
-    C_STRUCT aiVector3D* mTangents;
-
-    /** Vertex bitangents.
-    * The bitangent of a vertex points in the direction of the positive
-    * Y texture axis. The array contains normalized vectors, nullptr if not
-    * present. The array is mNumVertices in size.
-    * @note If the mesh contains tangents, it automatically also contains
-    * bitangents.
-    */
-    C_STRUCT aiVector3D* mBitangents;
-
-    /** Vertex color sets.
-    * A mesh may contain 0 to #AI_MAX_NUMBER_OF_COLOR_SETS vertex
-    * colors per vertex. nullptr if not present. Each array is
-    * mNumVertices in size if present.
-    */
-    C_STRUCT aiColor4D* mColors[AI_MAX_NUMBER_OF_COLOR_SETS];
-
-    /** Vertex texture coords, also known as UV channels.
-    * A mesh may contain 0 to AI_MAX_NUMBER_OF_TEXTURECOORDS per
-    * vertex. nullptr if not present. The array is mNumVertices in size.
-    */
-    C_STRUCT aiVector3D* mTextureCoords[AI_MAX_NUMBER_OF_TEXTURECOORDS];
-
-    /** Specifies the number of components for a given UV channel.
-    * Up to three channels are supported (UVW, for accessing volume
-    * or cube maps). If the value is 2 for a given channel n, the
-    * component p.z of mTextureCoords[n][p] is set to 0.0f.
-    * If the value is 1 for a given channel, p.y is set to 0.0f, too.
-    * @note 4D coords are not supported
-    */
-    unsigned int mNumUVComponents[AI_MAX_NUMBER_OF_TEXTURECOORDS];
-
-    /** The faces the mesh is constructed from.
-    * Each face refers to a number of vertices by their indices.
-    * This array is always present in a mesh, its size is given
-    * in mNumFaces. If the #AI_SCENE_FLAGS_NON_VERBOSE_FORMAT
-    * is NOT set each face references an unique set of vertices.
-    */
-    C_STRUCT aiFace* mFaces;
-
-    /** The number of bones this mesh contains.
-    * Can be 0, in which case the mBones array is nullptr.
-    */
-    unsigned int mNumBones;
-
-    /** The bones of this mesh.
-    * A bone consists of a name by which it can be found in the
-    * frame hierarchy and a set of vertex weights.
-    */
-    C_STRUCT aiBone** mBones;
-
-    /** The material used by this mesh.
-     * A mesh uses only a single material. If an imported model uses
-     * multiple materials, the import splits up the mesh. Use this value
-     * as index into the scene's material list.
-     */
-    unsigned int mMaterialIndex;
-
-    /** Name of the mesh. Meshes can be named, but this is not a
-     *  requirement and leaving this field empty is totally fine.
-     *  There are mainly three uses for mesh names:
-     *   - some formats name nodes and meshes independently.
-     *   - importers tend to split meshes up to meet the
-     *      one-material-per-mesh requirement. Assigning
-     *      the same (dummy) name to each of the result meshes
-     *      aids the caller at recovering the original mesh
-     *      partitioning.
-     *   - Vertex animations refer to meshes by their names.
-     **/
-    C_STRUCT aiString mName;
-
-
-    /** The number of attachment meshes. Note! Currently only works with Collada loader. */
-    unsigned int mNumAnimMeshes;
-
-    /** Attachment meshes for this mesh, for vertex-based animation.
-     *  Attachment meshes carry replacement data for some of the
-     *  mesh'es vertex components (usually positions, normals).
-     *  Note! Currently only works with Collada loader.*/
-    C_STRUCT aiAnimMesh** mAnimMeshes;
-
-    /** 
-     *  Method of morphing when animeshes are specified. 
-     */
-    unsigned int mMethod;
-
-    /**
-     *
-     */
-    C_STRUCT aiAABB mAABB;
-	
-#ifdef __cplusplus
-
-    //! Default constructor. Initializes all members to 0
-    aiMesh() AI_NO_EXCEPT
-    : mPrimitiveTypes( 0 )
-    , mNumVertices( 0 )
-    , mNumFaces( 0 )
-    , mVertices( nullptr )
-    , mNormals(nullptr)
-    , mTangents(nullptr)
-    , mBitangents(nullptr)
-    , mColors()
-    , mTextureCoords()
-    , mNumUVComponents()
-    , mFaces(nullptr)
-    , mNumBones( 0 )
-    , mBones(nullptr)
-    , mMaterialIndex( 0 )
-    , mNumAnimMeshes( 0 )
-    , mAnimMeshes(nullptr)
-    , mMethod( 0 )
-    , mAABB() {
-        for( unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; ++a ) {
-            mNumUVComponents[a] = 0;
-            mTextureCoords[a] = nullptr;
-        }
-
-        for (unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; ++a) {
-            mColors[a] = nullptr;
-        }
-    }
-
-    //! Deletes all storage allocated for the mesh
-    ~aiMesh() {
-        delete [] mVertices;
-        delete [] mNormals;
-        delete [] mTangents;
-        delete [] mBitangents;
-        for( unsigned int a = 0; a < AI_MAX_NUMBER_OF_TEXTURECOORDS; a++) {
-            delete [] mTextureCoords[a];
-        }
-        for( unsigned int a = 0; a < AI_MAX_NUMBER_OF_COLOR_SETS; a++) {
-            delete [] mColors[a];
-        }
-
-        // DO NOT REMOVE THIS ADDITIONAL CHECK
-        if (mNumBones && mBones)    {
-            for( unsigned int a = 0; a < mNumBones; a++) {
-                if(mBones[a])
-                {
-                    delete mBones[a];
-                }
-            }
-            delete [] mBones;
-        }
-
-        if (mNumAnimMeshes && mAnimMeshes)  {
-            for( unsigned int a = 0; a < mNumAnimMeshes; a++) {
-                delete mAnimMeshes[a];
-            }
-            delete [] mAnimMeshes;
-        }
-
-        delete [] mFaces;
-    }
-
-    //! Check whether the mesh contains positions. Provided no special
-    //! scene flags are set, this will always be true
-    bool HasPositions() const
-        { return mVertices != nullptr && mNumVertices > 0; }
-
-    //! Check whether the mesh contains faces. If no special scene flags
-    //! are set this should always return true
-    bool HasFaces() const
-        { return mFaces != nullptr && mNumFaces > 0; }
-
-    //! Check whether the mesh contains normal vectors
-    bool HasNormals() const
-        { return mNormals != nullptr && mNumVertices > 0; }
-
-    //! Check whether the mesh contains tangent and bitangent vectors
-    //! It is not possible that it contains tangents and no bitangents
-    //! (or the other way round). The existence of one of them
-    //! implies that the second is there, too.
-    bool HasTangentsAndBitangents() const
-        { return mTangents != nullptr && mBitangents != nullptr && mNumVertices > 0; }
-
-    //! Check whether the mesh contains a vertex color set
-    //! \param pIndex Index of the vertex color set
-    bool HasVertexColors( unsigned int pIndex) const {
-        if (pIndex >= AI_MAX_NUMBER_OF_COLOR_SETS) {
-            return false;
-        } else {
-            return mColors[pIndex] != nullptr && mNumVertices > 0;
-        }
-    }
-
-    //! Check whether the mesh contains a texture coordinate set
-    //! \param pIndex Index of the texture coordinates set
-    bool HasTextureCoords( unsigned int pIndex) const {
-        if (pIndex >= AI_MAX_NUMBER_OF_TEXTURECOORDS) {
-            return false;
-        } else {
-            return mTextureCoords[pIndex] != nullptr && mNumVertices > 0;
-        }
-    }
-
-    //! Get the number of UV channels the mesh contains
-    unsigned int GetNumUVChannels() const {
-        unsigned int n( 0 );
-        while (n < AI_MAX_NUMBER_OF_TEXTURECOORDS && mTextureCoords[n]) {
-            ++n;
-        }
-
-        return n;
-    }
-
-    //! Get the number of vertex color channels the mesh contains
-    unsigned int GetNumColorChannels() const {
-        unsigned int n(0);
-        while (n < AI_MAX_NUMBER_OF_COLOR_SETS && mColors[n]) {
-            ++n;
-        }
-        return n;
-    }
-
-    //! Check whether the mesh contains bones
-    bool HasBones() const {
-        return mBones != nullptr && mNumBones > 0;
-    }
-
-#endif // __cplusplus
-};
-
-#ifdef __cplusplus
-}
-#endif //! extern "C"
-#endif // AI_MESH_H_INC
-
diff --git a/thirdparty/assimp/include/assimp/metadata.h b/thirdparty/assimp/include/assimp/metadata.h
deleted file mode 100644
index 849d90f485..0000000000
--- a/thirdparty/assimp/include/assimp/metadata.h
+++ /dev/null
@@ -1,384 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file metadata.h
- *  @brief Defines the data structures for holding node meta information.
- */
-#pragma once
-#ifndef AI_METADATA_H_INC
-#define AI_METADATA_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#if defined(_MSC_VER) && (_MSC_VER <= 1500)
-#  include "Compiler/pstdint.h"
-#else
-#  include <stdint.h>
-#endif
-
-// -------------------------------------------------------------------------------
-/**
-  * Enum used to distinguish data types
-  */
- // -------------------------------------------------------------------------------
-typedef enum aiMetadataType {
-    AI_BOOL       = 0,
-    AI_INT32      = 1,
-    AI_UINT64     = 2,
-    AI_FLOAT      = 3,
-    AI_DOUBLE     = 4,
-    AI_AISTRING   = 5,
-    AI_AIVECTOR3D = 6,
-    AI_META_MAX   = 7,
-
-#ifndef SWIG
-    FORCE_32BIT = INT_MAX
-#endif
-} aiMetadataType;
-
-// -------------------------------------------------------------------------------
-/**
-  * Metadata entry
-  *
-  * The type field uniquely identifies the underlying type of the data field
-  */
- // -------------------------------------------------------------------------------
-struct aiMetadataEntry {
-    aiMetadataType mType;
-    void* mData;
-};
-
-#ifdef __cplusplus
-
-#include <string>
-
-// -------------------------------------------------------------------------------
-/**
-  * Helper functions to get the aiType enum entry for a type
-  */
- // -------------------------------------------------------------------------------
-
-inline aiMetadataType GetAiType( bool )       { return AI_BOOL; }
-inline aiMetadataType GetAiType( int32_t )    { return AI_INT32; }
-inline aiMetadataType GetAiType( uint64_t )   { return AI_UINT64; }
-inline aiMetadataType GetAiType( float )      { return AI_FLOAT; }
-inline aiMetadataType GetAiType( double )     { return AI_DOUBLE; }
-inline aiMetadataType GetAiType( const aiString & )   { return AI_AISTRING; }
-inline aiMetadataType GetAiType( const aiVector3D & ) { return AI_AIVECTOR3D; }
-
-#endif // __cplusplus
-
-// -------------------------------------------------------------------------------
-/**
-  * Container for holding metadata.
-  *
-  * Metadata is a key-value store using string keys and values.
-  */
- // -------------------------------------------------------------------------------
-struct aiMetadata {
-    /** Length of the mKeys and mValues arrays, respectively */
-    unsigned int mNumProperties;
-
-    /** Arrays of keys, may not be NULL. Entries in this array may not be NULL as well. */
-    C_STRUCT aiString* mKeys;
-
-    /** Arrays of values, may not be NULL. Entries in this array may be NULL if the
-      * corresponding property key has no assigned value. */
-    C_STRUCT aiMetadataEntry* mValues;
-
-#ifdef __cplusplus
-
-    /** 
-     *  @brief  The default constructor, set all members to zero by default.
-     */
-    aiMetadata() AI_NO_EXCEPT
-    : mNumProperties(0)
-    , mKeys(nullptr)
-    , mValues(nullptr) {
-        // empty
-    }
-
-    aiMetadata( const aiMetadata &rhs )
-    : mNumProperties( rhs.mNumProperties )
-    , mKeys( nullptr )
-    , mValues( nullptr ) {
-        mKeys = new aiString[ mNumProperties ];
-        for ( size_t i = 0; i < static_cast<size_t>( mNumProperties ); ++i ) {
-            mKeys[ i ] = rhs.mKeys[ i ];
-        }
-        mValues = new aiMetadataEntry[ mNumProperties ];
-        for ( size_t i = 0; i < static_cast<size_t>(mNumProperties); ++i ) {
-            mValues[ i ].mType = rhs.mValues[ i ].mType;
-            switch ( rhs.mValues[ i ].mType ) {
-            case AI_BOOL:
-                mValues[ i ].mData = new bool;
-                ::memcpy( mValues[ i ].mData, rhs.mValues[ i ].mData, sizeof(bool) );
-                break;
-            case AI_INT32: {
-                int32_t v;
-                ::memcpy( &v, rhs.mValues[ i ].mData, sizeof( int32_t ) );
-                mValues[ i ].mData = new int32_t( v );
-                }
-                break;
-            case AI_UINT64: {
-                    uint64_t v;
-                    ::memcpy( &v, rhs.mValues[ i ].mData, sizeof( uint64_t ) );
-                    mValues[ i ].mData = new  uint64_t( v );
-                }
-                break;
-            case AI_FLOAT: {
-                    float v;
-                    ::memcpy( &v, rhs.mValues[ i ].mData, sizeof( float ) );
-                    mValues[ i ].mData = new float( v );
-                }
-                break;
-            case AI_DOUBLE: {
-                    double v;
-                    ::memcpy( &v, rhs.mValues[ i ].mData, sizeof( double ) );
-                    mValues[ i ].mData = new double( v );
-                }
-                break;
-            case AI_AISTRING: {
-                    aiString v;
-                    rhs.Get<aiString>( mKeys[ i ], v );
-                    mValues[ i ].mData = new aiString( v );
-                }
-                break;
-            case AI_AIVECTOR3D: {
-                    aiVector3D v;
-                    rhs.Get<aiVector3D>( mKeys[ i ], v );
-                    mValues[ i ].mData = new aiVector3D( v );
-                }
-                break;
-#ifndef SWIG
-            case FORCE_32BIT:
-#endif
-            default:
-                break;
-            }
-
-        }
-    }
-
-    /** 
-     *  @brief The destructor.
-     */
-    ~aiMetadata() {
-        delete [] mKeys;
-        mKeys = nullptr;
-        if (mValues) {
-            // Delete each metadata entry
-            for (unsigned i=0; i<mNumProperties; ++i) {
-                void* data = mValues[i].mData;
-                switch (mValues[i].mType) {
-                case AI_BOOL:
-                    delete static_cast< bool* >( data );
-                    break;
-                case AI_INT32:
-                    delete static_cast< int32_t* >( data );
-                    break;
-                case AI_UINT64:
-                    delete static_cast< uint64_t* >( data );
-                    break;
-                case AI_FLOAT:
-                    delete static_cast< float* >( data );
-                    break;
-                case AI_DOUBLE:
-                    delete static_cast< double* >( data );
-                    break;
-                case AI_AISTRING:
-                    delete static_cast< aiString* >( data );
-                    break;
-                case AI_AIVECTOR3D:
-                    delete static_cast< aiVector3D* >( data );
-                    break;
-#ifndef SWIG
-                case FORCE_32BIT:
-#endif
-                default:
-                    break;
-                }
-            }
-
-            // Delete the metadata array
-            delete [] mValues;
-            mValues = nullptr;
-        }
-    }
-
-    /**
-     *  @brief Allocates property fields + keys.
-     *  @param  numProperties   Number of requested properties.
-     */
-    static inline
-    aiMetadata *Alloc( unsigned int numProperties ) {
-        if ( 0 == numProperties ) {
-            return nullptr;
-        }
-
-        aiMetadata *data = new aiMetadata;
-        data->mNumProperties = numProperties;
-        data->mKeys = new aiString[ data->mNumProperties ]();
-        data->mValues = new aiMetadataEntry[ data->mNumProperties ]();
-
-        return data;
-    }
-
-    /**
-     *  @brief Deallocates property fields + keys.
-     */
-    static inline
-    void Dealloc( aiMetadata *metadata ) {
-        delete metadata;
-    }
-
-	template<typename T>
-	inline
-    void Add(const std::string& key, const T& value) {
-		aiString* new_keys = new aiString[mNumProperties + 1];
-		aiMetadataEntry* new_values = new aiMetadataEntry[mNumProperties + 1];
-
-		for(unsigned int i = 0; i < mNumProperties; ++i)
-		{
-			new_keys[i] = mKeys[i];
-			new_values[i] = mValues[i];
-		}
-
-		delete mKeys;
-		delete mValues;
-
-		mKeys = new_keys;
-		mValues = new_values;
-
-		mNumProperties++;
-
-		Set(mNumProperties - 1, key, value);
-	}
-
-    template<typename T>
-    inline 
-    bool Set( unsigned index, const std::string& key, const T& value ) {
-        // In range assertion
-        if ( index >= mNumProperties ) {
-            return false;
-        }
-
-        // Ensure that we have a valid key.
-        if ( key.empty() ) {
-            return false;
-        }
-
-        // Set metadata key
-        mKeys[index] = key;
-
-        // Set metadata type
-        mValues[index].mType = GetAiType(value);
-        // Copy the given value to the dynamic storage
-        mValues[index].mData = new T(value);
-
-        return true;
-    }
-
-    template<typename T>
-    inline 
-    bool Get( unsigned index, T& value ) const {
-        // In range assertion
-        if ( index >= mNumProperties ) {
-            return false;
-        }
-
-        // Return false if the output data type does
-        // not match the found value's data type
-        if ( GetAiType( value ) != mValues[ index ].mType ) {
-            return false;
-        }
-
-        // Otherwise, output the found value and
-        // return true
-        value = *static_cast<T*>(mValues[index].mData);
-
-        return true;
-    }
-
-    template<typename T>
-    inline 
-    bool Get( const aiString& key, T& value ) const {
-        // Search for the given key
-        for ( unsigned int i = 0; i < mNumProperties; ++i ) {
-            if ( mKeys[ i ] == key ) {
-                return Get( i, value );
-            }
-        }
-        return false;
-    }
-
-    template<typename T>
-    inline
-    bool Get( const std::string& key, T& value ) const {
-        return Get(aiString(key), value);
-    }
-
-	/// Return metadata entry for analyzing it by user.
-	/// \param [in] pIndex - index of the entry.
-	/// \param [out] pKey - pointer to the key value.
-	/// \param [out] pEntry - pointer to the entry: type and value.
-	/// \return false - if pIndex is out of range, else - true.
-	inline
-    bool Get(size_t index, const aiString*& key, const aiMetadataEntry*& entry) const {
-        if ( index >= mNumProperties ) {
-            return false;
-        }
-
-		key = &mKeys[index];
-		entry = &mValues[index];
-
-		return true;
-	}
-
-#endif // __cplusplus
-
-};
-
-#endif // AI_METADATA_H_INC
diff --git a/thirdparty/assimp/include/assimp/pbrmaterial.h b/thirdparty/assimp/include/assimp/pbrmaterial.h
deleted file mode 100644
index 892a6347f7..0000000000
--- a/thirdparty/assimp/include/assimp/pbrmaterial.h
+++ /dev/null
@@ -1,80 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file pbrmaterial.h
- *  @brief Defines the material system of the library
- */
-#pragma once
-#ifndef AI_PBRMATERIAL_H_INC
-#define AI_PBRMATERIAL_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_FACTOR "$mat.gltf.pbrMetallicRoughness.baseColorFactor", 0, 0
-#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLIC_FACTOR "$mat.gltf.pbrMetallicRoughness.metallicFactor", 0, 0
-#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_ROUGHNESS_FACTOR "$mat.gltf.pbrMetallicRoughness.roughnessFactor", 0, 0
-#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_BASE_COLOR_TEXTURE aiTextureType_DIFFUSE, 1
-#define AI_MATKEY_GLTF_PBRMETALLICROUGHNESS_METALLICROUGHNESS_TEXTURE aiTextureType_UNKNOWN, 0
-#define AI_MATKEY_GLTF_ALPHAMODE "$mat.gltf.alphaMode", 0, 0
-#define AI_MATKEY_GLTF_ALPHACUTOFF "$mat.gltf.alphaCutoff", 0, 0
-#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS "$mat.gltf.pbrSpecularGlossiness", 0, 0
-#define AI_MATKEY_GLTF_PBRSPECULARGLOSSINESS_GLOSSINESS_FACTOR "$mat.gltf.pbrMetallicRoughness.glossinessFactor", 0, 0
-#define AI_MATKEY_GLTF_UNLIT "$mat.gltf.unlit", 0, 0
-
-#define _AI_MATKEY_GLTF_TEXTURE_TEXCOORD_BASE "$tex.file.texCoord"
-#define _AI_MATKEY_GLTF_MAPPINGNAME_BASE "$tex.mappingname"
-#define _AI_MATKEY_GLTF_MAPPINGID_BASE "$tex.mappingid"
-#define _AI_MATKEY_GLTF_MAPPINGFILTER_MAG_BASE "$tex.mappingfiltermag"
-#define _AI_MATKEY_GLTF_MAPPINGFILTER_MIN_BASE "$tex.mappingfiltermin"
-#define _AI_MATKEY_GLTF_SCALE_BASE "$tex.scale"
-#define _AI_MATKEY_GLTF_STRENGTH_BASE "$tex.strength"
-
-#define AI_MATKEY_GLTF_TEXTURE_TEXCOORD(type, N) _AI_MATKEY_GLTF_TEXTURE_TEXCOORD_BASE, type, N
-#define AI_MATKEY_GLTF_MAPPINGNAME(type, N) _AI_MATKEY_GLTF_MAPPINGNAME_BASE, type, N
-#define AI_MATKEY_GLTF_MAPPINGID(type, N) _AI_MATKEY_GLTF_MAPPINGID_BASE, type, N
-#define AI_MATKEY_GLTF_MAPPINGFILTER_MAG(type, N) _AI_MATKEY_GLTF_MAPPINGFILTER_MAG_BASE, type, N
-#define AI_MATKEY_GLTF_MAPPINGFILTER_MIN(type, N) _AI_MATKEY_GLTF_MAPPINGFILTER_MIN_BASE, type, N
-#define AI_MATKEY_GLTF_TEXTURE_SCALE(type, N) _AI_MATKEY_GLTF_SCALE_BASE, type, N
-#define AI_MATKEY_GLTF_TEXTURE_STRENGTH(type, N) _AI_MATKEY_GLTF_STRENGTH_BASE, type, N
-
-#endif //!!AI_PBRMATERIAL_H_INC
diff --git a/thirdparty/assimp/include/assimp/port/AndroidJNI/AndroidJNIIOSystem.h b/thirdparty/assimp/include/assimp/port/AndroidJNI/AndroidJNIIOSystem.h
deleted file mode 100644
index 41d8004877..0000000000
--- a/thirdparty/assimp/include/assimp/port/AndroidJNI/AndroidJNIIOSystem.h
+++ /dev/null
@@ -1,92 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2016, assimp team
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file Android implementation of IOSystem using the standard C file functions.
- * Aimed to ease the access to android assets */
-
-#if __ANDROID__ and __ANDROID_API__ > 9 and defined(AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT)
-#ifndef AI_ANDROIDJNIIOSYSTEM_H_INC
-#define AI_ANDROIDJNIIOSYSTEM_H_INC
-
-#include <assimp/DefaultIOSystem.h>
-#include <android/asset_manager.h>
-#include <android/asset_manager_jni.h>
-#include <android/native_activity.h>
-
-namespace Assimp	{
-
-// ---------------------------------------------------------------------------
-/** Android extension to DefaultIOSystem using the standard C file functions */
-class ASSIMP_API AndroidJNIIOSystem : public DefaultIOSystem
-{
-public:
-
-	/** Initialize android activity data */
-	std::string mApkWorkspacePath;
-	AAssetManager* mApkAssetManager;
-
-	/** Constructor. */
-	AndroidJNIIOSystem(ANativeActivity* activity);
-
-	/** Destructor. */
-	~AndroidJNIIOSystem();
-
-	// -------------------------------------------------------------------
-	/** Tests for the existence of a file at the given path. */
-	bool Exists( const char* pFile) const;
-
-	// -------------------------------------------------------------------
-	/** Opens a file at the given path, with given mode */
-	IOStream* Open( const char* strFile, const char* strMode);
-
-	// ------------------------------------------------------------------------------------------------
-	// Inits Android extractor
-	void AndroidActivityInit(ANativeActivity* activity);
-
-	// ------------------------------------------------------------------------------------------------
-	// Extracts android asset
-	bool AndroidExtractAsset(std::string name);
-
-};
-
-} //!ns Assimp
-
-#endif //AI_ANDROIDJNIIOSYSTEM_H_INC
-#endif //__ANDROID__ and __ANDROID_API__ > 9 and defined(AI_CONFIG_ANDROID_JNI_ASSIMP_MANAGER_SUPPORT)
diff --git a/thirdparty/assimp/include/assimp/postprocess.h b/thirdparty/assimp/include/assimp/postprocess.h
deleted file mode 100644
index 4b6732e80a..0000000000
--- a/thirdparty/assimp/include/assimp/postprocess.h
+++ /dev/null
@@ -1,703 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file postprocess.h
- *  @brief Definitions for import post processing steps
- */
-#pragma once
-#ifndef AI_POSTPROCESS_H_INC
-#define AI_POSTPROCESS_H_INC
-
-#include <assimp/types.h>
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// -----------------------------------------------------------------------------------
-/** @enum  aiPostProcessSteps
- *  @brief Defines the flags for all possible post processing steps.
- *
- *  @note Some steps are influenced by properties set on the Assimp::Importer itself
- *
- *  @see Assimp::Importer::ReadFile()
- *  @see Assimp::Importer::SetPropertyInteger()
- *  @see aiImportFile
- *  @see aiImportFileEx
- */
-// -----------------------------------------------------------------------------------
-enum aiPostProcessSteps
-{
-
-    // -------------------------------------------------------------------------
-    /** <hr>Calculates the tangents and bitangents for the imported meshes.
-     *
-     * Does nothing if a mesh does not have normals. You might want this post
-     * processing step to be executed if you plan to use tangent space calculations
-     * such as normal mapping  applied to the meshes. There's an importer property,
-     * <tt>#AI_CONFIG_PP_CT_MAX_SMOOTHING_ANGLE</tt>, which allows you to specify
-     * a maximum smoothing angle for the algorithm. However, usually you'll
-     * want to leave it at the default value.
-     */
-    aiProcess_CalcTangentSpace = 0x1,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Identifies and joins identical vertex data sets within all
-     *  imported meshes.
-     *
-     * After this step is run, each mesh contains unique vertices,
-     * so a vertex may be used by multiple faces. You usually want
-     * to use this post processing step. If your application deals with
-     * indexed geometry, this step is compulsory or you'll just waste rendering
-     * time. <b>If this flag is not specified</b>, no vertices are referenced by
-     * more than one face and <b>no index buffer is required</b> for rendering.
-     */
-    aiProcess_JoinIdenticalVertices = 0x2,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Converts all the imported data to a left-handed coordinate space.
-     *
-     * By default the data is returned in a right-handed coordinate space (which
-     * OpenGL prefers). In this space, +X points to the right,
-     * +Z points towards the viewer, and +Y points upwards. In the DirectX
-     * coordinate space +X points to the right, +Y points upwards, and +Z points
-     * away from the viewer.
-     *
-     * You'll probably want to consider this flag if you use Direct3D for
-     * rendering. The #aiProcess_ConvertToLeftHanded flag supersedes this
-     * setting and bundles all conversions typically required for D3D-based
-     * applications.
-     */
-    aiProcess_MakeLeftHanded = 0x4,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Triangulates all faces of all meshes.
-     *
-     * By default the imported mesh data might contain faces with more than 3
-     * indices. For rendering you'll usually want all faces to be triangles.
-     * This post processing step splits up faces with more than 3 indices into
-     * triangles. Line and point primitives are *not* modified! If you want
-     * 'triangles only' with no other kinds of primitives, try the following
-     * solution:
-     * <ul>
-     * <li>Specify both #aiProcess_Triangulate and #aiProcess_SortByPType </li>
-     * <li>Ignore all point and line meshes when you process assimp's output</li>
-     * </ul>
-     */
-    aiProcess_Triangulate = 0x8,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Removes some parts of the data structure (animations, materials,
-     *  light sources, cameras, textures, vertex components).
-     *
-     * The  components to be removed are specified in a separate
-     * importer property, <tt>#AI_CONFIG_PP_RVC_FLAGS</tt>. This is quite useful
-     * if you don't need all parts of the output structure. Vertex colors
-     * are rarely used today for example... Calling this step to remove unneeded
-     * data from the pipeline as early as possible results in increased
-     * performance and a more optimized output data structure.
-     * This step is also useful if you want to force Assimp to recompute
-     * normals or tangents. The corresponding steps don't recompute them if
-     * they're already there (loaded from the source asset). By using this
-     * step you can make sure they are NOT there.
-     *
-     * This flag is a poor one, mainly because its purpose is usually
-     * misunderstood. Consider the following case: a 3D model has been exported
-     * from a CAD app, and it has per-face vertex colors. Vertex positions can't be
-     * shared, thus the #aiProcess_JoinIdenticalVertices step fails to
-     * optimize the data because of these nasty little vertex colors.
-     * Most apps don't even process them, so it's all for nothing. By using
-     * this step, unneeded components are excluded as early as possible
-     * thus opening more room for internal optimizations.
-     */
-    aiProcess_RemoveComponent = 0x10,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Generates normals for all faces of all meshes.
-     *
-     * This is ignored if normals are already there at the time this flag
-     * is evaluated. Model importers try to load them from the source file, so
-     * they're usually already there. Face normals are shared between all points
-     * of a single face, so a single point can have multiple normals, which
-     * forces the library to duplicate vertices in some cases.
-     * #aiProcess_JoinIdenticalVertices is *senseless* then.
-     *
-     * This flag may not be specified together with #aiProcess_GenSmoothNormals.
-     */
-    aiProcess_GenNormals = 0x20,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Generates smooth normals for all vertices in the mesh.
-    *
-    * This is ignored if normals are already there at the time this flag
-    * is evaluated. Model importers try to load them from the source file, so
-    * they're usually already there.
-    *
-    * This flag may not be specified together with
-    * #aiProcess_GenNormals. There's a importer property,
-    * <tt>#AI_CONFIG_PP_GSN_MAX_SMOOTHING_ANGLE</tt> which allows you to specify
-    * an angle maximum for the normal smoothing algorithm. Normals exceeding
-    * this limit are not smoothed, resulting in a 'hard' seam between two faces.
-    * Using a decent angle here (e.g. 80 degrees) results in very good visual
-    * appearance.
-    */
-    aiProcess_GenSmoothNormals = 0x40,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Splits large meshes into smaller sub-meshes.
-    *
-    * This is quite useful for real-time rendering, where the number of triangles
-    * which can be maximally processed in a single draw-call is limited
-    * by the video driver/hardware. The maximum vertex buffer is usually limited
-    * too. Both requirements can be met with this step: you may specify both a
-    * triangle and vertex limit for a single mesh.
-    *
-    * The split limits can (and should!) be set through the
-    * <tt>#AI_CONFIG_PP_SLM_VERTEX_LIMIT</tt> and <tt>#AI_CONFIG_PP_SLM_TRIANGLE_LIMIT</tt>
-    * importer properties. The default values are <tt>#AI_SLM_DEFAULT_MAX_VERTICES</tt> and
-    * <tt>#AI_SLM_DEFAULT_MAX_TRIANGLES</tt>.
-    *
-    * Note that splitting is generally a time-consuming task, but only if there's
-    * something to split. The use of this step is recommended for most users.
-    */
-    aiProcess_SplitLargeMeshes = 0x80,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Removes the node graph and pre-transforms all vertices with
-    * the local transformation matrices of their nodes.
-    *
-    * The output scene still contains nodes, however there is only a
-    * root node with children, each one referencing only one mesh,
-    * and each mesh referencing one material. For rendering, you can
-    * simply render all meshes in order - you don't need to pay
-    * attention to local transformations and the node hierarchy.
-    * Animations are removed during this step.
-    * This step is intended for applications without a scenegraph.
-    * The step CAN cause some problems: if e.g. a mesh of the asset
-    * contains normals and another, using the same material index, does not,
-    * they will be brought together, but the first meshes's part of
-    * the normal list is zeroed. However, these artifacts are rare.
-    * @note The <tt>#AI_CONFIG_PP_PTV_NORMALIZE</tt> configuration property
-    * can be set to normalize the scene's spatial dimension to the -1...1
-    * range.
-    */
-    aiProcess_PreTransformVertices = 0x100,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Limits the number of bones simultaneously affecting a single vertex
-    *  to a maximum value.
-    *
-    * If any vertex is affected by more than the maximum number of bones, the least
-    * important vertex weights are removed and the remaining vertex weights are
-    * renormalized so that the weights still sum up to 1.
-    * The default bone weight limit is 4 (defined as <tt>#AI_LMW_MAX_WEIGHTS</tt> in
-    * config.h), but you can use the <tt>#AI_CONFIG_PP_LBW_MAX_WEIGHTS</tt> importer
-    * property to supply your own limit to the post processing step.
-    *
-    * If you intend to perform the skinning in hardware, this post processing
-    * step might be of interest to you.
-    */
-    aiProcess_LimitBoneWeights = 0x200,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Validates the imported scene data structure.
-     * This makes sure that all indices are valid, all animations and
-     * bones are linked correctly, all material references are correct .. etc.
-     *
-     * It is recommended that you capture Assimp's log output if you use this flag,
-     * so you can easily find out what's wrong if a file fails the
-     * validation. The validator is quite strict and will find *all*
-     * inconsistencies in the data structure... It is recommended that plugin
-     * developers use it to debug their loaders. There are two types of
-     * validation failures:
-     * <ul>
-     * <li>Error: There's something wrong with the imported data. Further
-     *   postprocessing is not possible and the data is not usable at all.
-     *   The import fails. #Importer::GetErrorString() or #aiGetErrorString()
-     *   carry the error message around.</li>
-     * <li>Warning: There are some minor issues (e.g. 1000000 animation
-     *   keyframes with the same time), but further postprocessing and use
-     *   of the data structure is still safe. Warning details are written
-     *   to the log file, <tt>#AI_SCENE_FLAGS_VALIDATION_WARNING</tt> is set
-     *   in #aiScene::mFlags</li>
-     * </ul>
-     *
-     * This post-processing step is not time-consuming. Its use is not
-     * compulsory, but recommended.
-    */
-    aiProcess_ValidateDataStructure = 0x400,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Reorders triangles for better vertex cache locality.
-     *
-     * The step tries to improve the ACMR (average post-transform vertex cache
-     * miss ratio) for all meshes. The implementation runs in O(n) and is
-     * roughly based on the 'tipsify' algorithm (see <a href="
-     * http://www.cs.princeton.edu/gfx/pubs/Sander_2007_%3ETR/tipsy.pdf">this
-     * paper</a>).
-     *
-     * If you intend to render huge models in hardware, this step might
-     * be of interest to you. The <tt>#AI_CONFIG_PP_ICL_PTCACHE_SIZE</tt>
-     * importer property can be used to fine-tune the cache optimization.
-     */
-    aiProcess_ImproveCacheLocality = 0x800,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Searches for redundant/unreferenced materials and removes them.
-     *
-     * This is especially useful in combination with the
-     * #aiProcess_PreTransformVertices and #aiProcess_OptimizeMeshes flags.
-     * Both join small meshes with equal characteristics, but they can't do
-     * their work if two meshes have different materials. Because several
-     * material settings are lost during Assimp's import filters,
-     * (and because many exporters don't check for redundant materials), huge
-     * models often have materials which are are defined several times with
-     * exactly the same settings.
-     *
-     * Several material settings not contributing to the final appearance of
-     * a surface are ignored in all comparisons (e.g. the material name).
-     * So, if you're passing additional information through the
-     * content pipeline (probably using *magic* material names), don't
-     * specify this flag. Alternatively take a look at the
-     * <tt>#AI_CONFIG_PP_RRM_EXCLUDE_LIST</tt> importer property.
-     */
-    aiProcess_RemoveRedundantMaterials = 0x1000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step tries to determine which meshes have normal vectors
-     * that are facing inwards and inverts them.
-     *
-     * The algorithm is simple but effective:
-     * the bounding box of all vertices + their normals is compared against
-     * the volume of the bounding box of all vertices without their normals.
-     * This works well for most objects, problems might occur with planar
-     * surfaces. However, the step tries to filter such cases.
-     * The step inverts all in-facing normals. Generally it is recommended
-     * to enable this step, although the result is not always correct.
-    */
-    aiProcess_FixInfacingNormals = 0x2000,
-
-
-
-    // -------------------------------------------------------------------------
-    /** 
-     * This step generically populates aiBone->mArmature and aiBone->mNode generically
-     * The point of these is it saves you later having to calculate these elements
-     * This is useful when handling rest information or skin information
-     * If you have multiple armatures on your models we strongly recommend enabling this 
-     * Instead of writing your own multi-root, multi-armature lookups we have done the 
-     * hard work for you :)
-   */
-    aiProcess_PopulateArmatureData = 0x4000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step splits meshes with more than one primitive type in
-     *  homogeneous sub-meshes.
-     *
-     *  The step is executed after the triangulation step. After the step
-     *  returns, just one bit is set in aiMesh::mPrimitiveTypes. This is
-     *  especially useful for real-time rendering where point and line
-     *  primitives are often ignored or rendered separately.
-     *  You can use the <tt>#AI_CONFIG_PP_SBP_REMOVE</tt> importer property to
-     *  specify which primitive types you need. This can be used to easily
-     *  exclude lines and points, which are rarely used, from the import.
-    */
-    aiProcess_SortByPType = 0x8000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step searches all meshes for degenerate primitives and
-     *  converts them to proper lines or points.
-     *
-     * A face is 'degenerate' if one or more of its points are identical.
-     * To have the degenerate stuff not only detected and collapsed but
-     * removed, try one of the following procedures:
-     * <br><b>1.</b> (if you support lines and points for rendering but don't
-     *    want the degenerates)<br>
-     * <ul>
-     *   <li>Specify the #aiProcess_FindDegenerates flag.
-     *   </li>
-     *   <li>Set the <tt>#AI_CONFIG_PP_FD_REMOVE</tt> importer property to
-     *       1. This will cause the step to remove degenerate triangles from the
-     *       import as soon as they're detected. They won't pass any further
-     *       pipeline steps.
-     *   </li>
-     * </ul>
-     * <br><b>2.</b>(if you don't support lines and points at all)<br>
-     * <ul>
-     *   <li>Specify the #aiProcess_FindDegenerates flag.
-     *   </li>
-     *   <li>Specify the #aiProcess_SortByPType flag. This moves line and
-     *     point primitives to separate meshes.
-     *   </li>
-     *   <li>Set the <tt>#AI_CONFIG_PP_SBP_REMOVE</tt> importer property to
-     *       @code aiPrimitiveType_POINTS | aiPrimitiveType_LINES
-     *       @endcode to cause SortByPType to reject point
-     *       and line meshes from the scene.
-     *   </li>
-     * </ul>
-     *
-     * This step also removes very small triangles with a surface area smaller
-     * than 10^-6. If you rely on having these small triangles, or notice holes
-     * in your model, set the property <tt>#AI_CONFIG_PP_FD_CHECKAREA</tt> to
-     * false.
-     * @note Degenerate polygons are not necessarily evil and that's why
-     * they're not removed by default. There are several file formats which
-     * don't support lines or points, and some exporters bypass the
-     * format specification and write them as degenerate triangles instead.
-    */
-    aiProcess_FindDegenerates = 0x10000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step searches all meshes for invalid data, such as zeroed
-     *  normal vectors or invalid UV coords and removes/fixes them. This is
-     *  intended to get rid of some common exporter errors.
-     *
-     * This is especially useful for normals. If they are invalid, and
-     * the step recognizes this, they will be removed and can later
-     * be recomputed, i.e. by the #aiProcess_GenSmoothNormals flag.<br>
-     * The step will also remove meshes that are infinitely small and reduce
-     * animation tracks consisting of hundreds if redundant keys to a single
-     * key. The <tt>AI_CONFIG_PP_FID_ANIM_ACCURACY</tt> config property decides
-     * the accuracy of the check for duplicate animation tracks.
-    */
-    aiProcess_FindInvalidData = 0x20000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step converts non-UV mappings (such as spherical or
-     *  cylindrical mapping) to proper texture coordinate channels.
-     *
-     * Most applications will support UV mapping only, so you will
-     * probably want to specify this step in every case. Note that Assimp is not
-     * always able to match the original mapping implementation of the
-     * 3D app which produced a model perfectly. It's always better to let the
-     * modelling app compute the UV channels - 3ds max, Maya, Blender,
-     * LightWave, and Modo do this for example.
-     *
-     * @note If this step is not requested, you'll need to process the
-     * <tt>#AI_MATKEY_MAPPING</tt> material property in order to display all assets
-     * properly.
-     */
-    aiProcess_GenUVCoords = 0x40000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step applies per-texture UV transformations and bakes
-     *  them into stand-alone vtexture coordinate channels.
-     *
-     * UV transformations are specified per-texture - see the
-     * <tt>#AI_MATKEY_UVTRANSFORM</tt> material key for more information.
-     * This step processes all textures with
-     * transformed input UV coordinates and generates a new (pre-transformed) UV channel
-     * which replaces the old channel. Most applications won't support UV
-     * transformations, so you will probably want to specify this step.
-     *
-     * @note UV transformations are usually implemented in real-time apps by
-     * transforming texture coordinates at vertex shader stage with a 3x3
-     * (homogenous) transformation matrix.
-    */
-    aiProcess_TransformUVCoords = 0x80000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step searches for duplicate meshes and replaces them
-     *  with references to the first mesh.
-     *
-     *  This step takes a while, so don't use it if speed is a concern.
-     *  Its main purpose is to workaround the fact that many export
-     *  file formats don't support instanced meshes, so exporters need to
-     *  duplicate meshes. This step removes the duplicates again. Please
-     *  note that Assimp does not currently support per-node material
-     *  assignment to meshes, which means that identical meshes with
-     *  different materials are currently *not* joined, although this is
-     *  planned for future versions.
-     */
-    aiProcess_FindInstances = 0x100000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>A post-processing step to reduce the number of meshes.
-     *
-     *  This will, in fact, reduce the number of draw calls.
-     *
-     *  This is a very effective optimization and is recommended to be used
-     *  together with #aiProcess_OptimizeGraph, if possible. The flag is fully
-     *  compatible with both #aiProcess_SplitLargeMeshes and #aiProcess_SortByPType.
-    */
-    aiProcess_OptimizeMeshes  = 0x200000,
-
-
-    // -------------------------------------------------------------------------
-    /** <hr>A post-processing step to optimize the scene hierarchy.
-     *
-     *  Nodes without animations, bones, lights or cameras assigned are
-     *  collapsed and joined.
-     *
-     *  Node names can be lost during this step. If you use special 'tag nodes'
-     *  to pass additional information through your content pipeline, use the
-     *  <tt>#AI_CONFIG_PP_OG_EXCLUDE_LIST</tt> importer property to specify a
-     *  list of node names you want to be kept. Nodes matching one of the names
-     *  in this list won't be touched or modified.
-     *
-     *  Use this flag with caution. Most simple files will be collapsed to a
-     *  single node, so complex hierarchies are usually completely lost. This is not
-     *  useful for editor environments, but probably a very effective
-     *  optimization if you just want to get the model data, convert it to your
-     *  own format, and render it as fast as possible.
-     *
-     *  This flag is designed to be used with #aiProcess_OptimizeMeshes for best
-     *  results.
-     *
-     *  @note 'Crappy' scenes with thousands of extremely small meshes packed
-     *  in deeply nested nodes exist for almost all file formats.
-     *  #aiProcess_OptimizeMeshes in combination with #aiProcess_OptimizeGraph
-     *  usually fixes them all and makes them renderable.
-    */
-    aiProcess_OptimizeGraph  = 0x400000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step flips all UV coordinates along the y-axis and adjusts
-     * material settings and bitangents accordingly.
-     *
-     * <b>Output UV coordinate system:</b>
-     * @code
-     * 0y|0y ---------- 1x|0y
-     * |                 |
-     * |                 |
-     * |                 |
-     * 0x|1y ---------- 1x|1y
-     * @endcode
-     *
-     * You'll probably want to consider this flag if you use Direct3D for
-     * rendering. The #aiProcess_ConvertToLeftHanded flag supersedes this
-     * setting and bundles all conversions typically required for D3D-based
-     * applications.
-    */
-    aiProcess_FlipUVs = 0x800000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step adjusts the output face winding order to be CW.
-     *
-     * The default face winding order is counter clockwise (CCW).
-     *
-     * <b>Output face order:</b>
-     * @code
-     *       x2
-     *
-     *                         x0
-     *  x1
-     * @endcode
-    */
-    aiProcess_FlipWindingOrder  = 0x1000000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step splits meshes with many bones into sub-meshes so that each
-     * sub-mesh has fewer or as many bones as a given limit.
-    */
-    aiProcess_SplitByBoneCount  = 0x2000000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step removes bones losslessly or according to some threshold.
-     *
-     *  In some cases (i.e. formats that require it) exporters are forced to
-     *  assign dummy bone weights to otherwise static meshes assigned to
-     *  animated meshes. Full, weight-based skinning is expensive while
-     *  animating nodes is extremely cheap, so this step is offered to clean up
-     *  the data in that regard.
-     *
-     *  Use <tt>#AI_CONFIG_PP_DB_THRESHOLD</tt> to control this.
-     *  Use <tt>#AI_CONFIG_PP_DB_ALL_OR_NONE</tt> if you want bones removed if and
-     *  only if all bones within the scene qualify for removal.
-    */
-    aiProcess_Debone  = 0x4000000,
-
-
-
-    // -------------------------------------------------------------------------
-    /** <hr>This step will perform a global scale of the model.
-    *
-    *  Some importers are providing a mechanism to define a scaling unit for the
-    *  model. This post processing step can be used to do so. You need to get the
-    *  global scaling from your importer settings like in FBX. Use the flag
-    *  AI_CONFIG_GLOBAL_SCALE_FACTOR_KEY from the global property table to configure this.
-    *
-    *  Use <tt>#AI_CONFIG_GLOBAL_SCALE_FACTOR_KEY</tt> to setup the global scaling factor.
-    */
-    aiProcess_GlobalScale = 0x8000000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>A postprocessing step to embed of textures.
-     *
-     *  This will remove external data dependencies for textures.
-     *  If a texture's file does not exist at the specified path
-     *  (due, for instance, to an absolute path generated on another system),
-     *  it will check if a file with the same name exists at the root folder
-     *  of the imported model. And if so, it uses that.
-     */
-    aiProcess_EmbedTextures  = 0x10000000,
-        
-    // aiProcess_GenEntityMeshes = 0x100000,
-    // aiProcess_OptimizeAnimations = 0x200000
-    // aiProcess_FixTexturePaths = 0x200000
-
-
-    aiProcess_ForceGenNormals = 0x20000000,
-
-    // -------------------------------------------------------------------------
-    /** <hr>Drops normals for all faces of all meshes.
-     *
-     * This is ignored if no normals are present.
-     * Face normals are shared between all points of a single face,
-     * so a single point can have multiple normals, which
-     * forces the library to duplicate vertices in some cases.
-     * #aiProcess_JoinIdenticalVertices is *senseless* then.
-     * This process gives sense back to aiProcess_JoinIdenticalVertices
-     */
-    aiProcess_DropNormals = 0x40000000,
-
-    // -------------------------------------------------------------------------
-    /**
-     */
-    aiProcess_GenBoundingBoxes = 0x80000000
-};
-
-
-// ---------------------------------------------------------------------------------------
-/** @def aiProcess_ConvertToLeftHanded
- *  @brief Shortcut flag for Direct3D-based applications.
- *
- *  Supersedes the #aiProcess_MakeLeftHanded and #aiProcess_FlipUVs and
- *  #aiProcess_FlipWindingOrder flags.
- *  The output data matches Direct3D's conventions: left-handed geometry, upper-left
- *  origin for UV coordinates and finally clockwise face order, suitable for CCW culling.
- *
- *  @deprecated
- */
-#define aiProcess_ConvertToLeftHanded ( \
-    aiProcess_MakeLeftHanded     | \
-    aiProcess_FlipUVs            | \
-    aiProcess_FlipWindingOrder   | \
-    0 )
-
-
-// ---------------------------------------------------------------------------------------
-/** @def aiProcessPreset_TargetRealtime_Fast
- *  @brief Default postprocess configuration optimizing the data for real-time rendering.
- *
- *  Applications would want to use this preset to load models on end-user PCs,
- *  maybe for direct use in game.
- *
- * If you're using DirectX, don't forget to combine this value with
- * the #aiProcess_ConvertToLeftHanded step. If you don't support UV transformations
- * in your application apply the #aiProcess_TransformUVCoords step, too.
- *  @note Please take the time to read the docs for the steps enabled by this preset.
- *  Some of them offer further configurable properties, while some of them might not be of
- *  use for you so it might be better to not specify them.
- */
-#define aiProcessPreset_TargetRealtime_Fast ( \
-    aiProcess_CalcTangentSpace      |  \
-    aiProcess_GenNormals            |  \
-    aiProcess_JoinIdenticalVertices |  \
-    aiProcess_Triangulate           |  \
-    aiProcess_GenUVCoords           |  \
-    aiProcess_SortByPType           |  \
-    0 )
-
- // ---------------------------------------------------------------------------------------
- /** @def aiProcessPreset_TargetRealtime_Quality
-  *  @brief Default postprocess configuration optimizing the data for real-time rendering.
-  *
-  *  Unlike #aiProcessPreset_TargetRealtime_Fast, this configuration
-  *  performs some extra optimizations to improve rendering speed and
-  *  to minimize memory usage. It could be a good choice for a level editor
-  *  environment where import speed is not so important.
-  *
-  *  If you're using DirectX, don't forget to combine this value with
-  *  the #aiProcess_ConvertToLeftHanded step. If you don't support UV transformations
-  *  in your application apply the #aiProcess_TransformUVCoords step, too.
-  *  @note Please take the time to read the docs for the steps enabled by this preset.
-  *  Some of them offer further configurable properties, while some of them might not be
-  *  of use for you so it might be better to not specify them.
-  */
-#define aiProcessPreset_TargetRealtime_Quality ( \
-    aiProcess_CalcTangentSpace              |  \
-    aiProcess_GenSmoothNormals              |  \
-    aiProcess_JoinIdenticalVertices         |  \
-    aiProcess_ImproveCacheLocality          |  \
-    aiProcess_LimitBoneWeights              |  \
-    aiProcess_RemoveRedundantMaterials      |  \
-    aiProcess_SplitLargeMeshes              |  \
-    aiProcess_Triangulate                   |  \
-    aiProcess_GenUVCoords                   |  \
-    aiProcess_SortByPType                   |  \
-    aiProcess_FindDegenerates               |  \
-    aiProcess_FindInvalidData               |  \
-    0 )
-
- // ---------------------------------------------------------------------------------------
- /** @def aiProcessPreset_TargetRealtime_MaxQuality
-  *  @brief Default postprocess configuration optimizing the data for real-time rendering.
-  *
-  *  This preset enables almost every optimization step to achieve perfectly
-  *  optimized data. It's your choice for level editor environments where import speed
-  *  is not important.
-  *
-  *  If you're using DirectX, don't forget to combine this value with
-  *  the #aiProcess_ConvertToLeftHanded step. If you don't support UV transformations
-  *  in your application, apply the #aiProcess_TransformUVCoords step, too.
-  *  @note Please take the time to read the docs for the steps enabled by this preset.
-  *  Some of them offer further configurable properties, while some of them might not be
-  *  of use for you so it might be better to not specify them.
-  */
-#define aiProcessPreset_TargetRealtime_MaxQuality ( \
-    aiProcessPreset_TargetRealtime_Quality   |  \
-    aiProcess_FindInstances                  |  \
-    aiProcess_ValidateDataStructure          |  \
-    aiProcess_OptimizeMeshes                 |  \
-    0 )
-
-
-#ifdef __cplusplus
-} // end of extern "C"
-#endif
-
-#endif // AI_POSTPROCESS_H_INC
diff --git a/thirdparty/assimp/include/assimp/qnan.h b/thirdparty/assimp/include/assimp/qnan.h
deleted file mode 100644
index 06780da5b8..0000000000
--- a/thirdparty/assimp/include/assimp/qnan.h
+++ /dev/null
@@ -1,162 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/**  @file  qnan.h
- *   @brief Some utilities for our dealings with qnans.
- *
- *   @note Some loaders use qnans to mark invalid values tempoarily, also
- *     Assimp explicitly enforces undefined normals to be set to qnan.
- *     qnan utilities are available in standard libraries (C99 for example)
- *     but last time I checked compiler coverage was so bad that I decided
- *     to reinvent the wheel.
- */
-#pragma once
-#ifndef AI_QNAN_H_INCLUDED
-#define AI_QNAN_H_INCLUDED
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/defs.h>
-
-#include <limits>
-#include <stdint.h>
-
-// ---------------------------------------------------------------------------
-/** Data structure to represent the bit pattern of a 32 Bit
- *         IEEE 754 floating-point number. */
-union _IEEESingle {
-    float Float;
-    struct
-    {
-        uint32_t Frac : 23;
-        uint32_t Exp  : 8;
-        uint32_t Sign : 1;
-    } IEEE;
-};
-
-// ---------------------------------------------------------------------------
-/** Data structure to represent the bit pattern of a 64 Bit
- *         IEEE 754 floating-point number. */
-union _IEEEDouble {
-    double Double;
-    struct
-    {
-        uint64_t Frac : 52;
-        uint64_t Exp  : 11;
-        uint64_t Sign : 1;
-    } IEEE;
-};
-
-// ---------------------------------------------------------------------------
-/** Check whether a given float is qNaN.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_qnan(float in) {
-    // the straightforward solution does not work:
-    //   return (in != in);
-    // compiler generates code like this
-    //   load <in> to <register-with-different-width>
-    //   compare <register-with-different-width> against <in>
-
-    // FIXME: Use <float> stuff instead? I think fpclassify needs C99
-    _IEEESingle temp;
-    memcpy(&temp, &in, sizeof(float));
-    return (temp.IEEE.Exp == (1u << 8)-1 &&
-        temp.IEEE.Frac);
-}
-
-// ---------------------------------------------------------------------------
-/** Check whether a given double is qNaN.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_qnan(double in) {
-    // the straightforward solution does not work:
-    //   return (in != in);
-    // compiler generates code like this
-    //   load <in> to <register-with-different-width>
-    //   compare <register-with-different-width> against <in>
-
-    // FIXME: Use <float> stuff instead? I think fpclassify needs C99
-    _IEEEDouble temp;
-    memcpy(&temp, &in, sizeof(in));
-    return (temp.IEEE.Exp == (1u << 11)-1 &&
-        temp.IEEE.Frac);
-}
-
-// ---------------------------------------------------------------------------
-/** @brief check whether a float is either NaN or (+/-) INF.
- *
- *  Denorms return false, they're treated like normal values.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_special_float(float in) {
-    _IEEESingle temp;
-    memcpy(&temp, &in, sizeof(float));
-    return (temp.IEEE.Exp == (1u << 8)-1);
-}
-
-// ---------------------------------------------------------------------------
-/** @brief check whether a double is either NaN or (+/-) INF.
- *
- *  Denorms return false, they're treated like normal values.
- *  @param in Input value */
-AI_FORCE_INLINE bool is_special_float(double in) {
-   _IEEESingle temp;
-    memcpy(&temp, &in, sizeof(float));
-    return (temp.IEEE.Exp == (1u << 11)-1);
-}
-
-// ---------------------------------------------------------------------------
-/** Check whether a float is NOT qNaN.
- *  @param in Input value */
-template<class TReal>
-AI_FORCE_INLINE bool is_not_qnan(TReal in) {
-    return !is_qnan(in);
-}
-
-// ---------------------------------------------------------------------------
-/** @brief Get a fresh qnan.  */
-AI_FORCE_INLINE ai_real get_qnan() {
-    return std::numeric_limits<ai_real>::quiet_NaN();
-}
-
-#endif // !! AI_QNAN_H_INCLUDED
diff --git a/thirdparty/assimp/include/assimp/quaternion.h b/thirdparty/assimp/include/assimp/quaternion.h
deleted file mode 100644
index ae45959b41..0000000000
--- a/thirdparty/assimp/include/assimp/quaternion.h
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
-Open Asset Import Library (assimp)
-----------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the
-following conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-----------------------------------------------------------------------
-*/
-
-/** @file quaternion.h
- *  @brief Quaternion structure, including operators when compiling in C++
- */
-#pragma once
-#ifndef AI_QUATERNION_H_INC
-#define AI_QUATERNION_H_INC
-
-#ifdef __cplusplus
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/defs.h>
-
-template <typename TReal> class aiVector3t;
-template <typename TReal> class aiMatrix3x3t;
-
-// ---------------------------------------------------------------------------
-/** Represents a quaternion in a 4D vector. */
-template <typename TReal>
-class aiQuaterniont
-{
-public:
-    aiQuaterniont() AI_NO_EXCEPT : w(1.0), x(), y(), z() {}
-    aiQuaterniont(TReal pw, TReal px, TReal py, TReal pz)
-        : w(pw), x(px), y(py), z(pz) {}
-
-    /** Construct from rotation matrix. Result is undefined if the matrix is not orthonormal. */
-    explicit aiQuaterniont( const aiMatrix3x3t<TReal>& pRotMatrix);
-
-    /** Construct from euler angles */
-    aiQuaterniont( TReal rotx, TReal roty, TReal rotz);
-
-    /** Construct from an axis-angle pair */
-    aiQuaterniont( aiVector3t<TReal> axis, TReal angle);
-
-    /** Construct from a normalized quaternion stored in a vec3 */
-    explicit aiQuaterniont( aiVector3t<TReal> normalized);
-
-    /** Returns a matrix representation of the quaternion */
-    aiMatrix3x3t<TReal> GetMatrix() const;
-
-public:
-
-    bool operator== (const aiQuaterniont& o) const;
-    bool operator!= (const aiQuaterniont& o) const;
-
-    bool Equal(const aiQuaterniont& o, TReal epsilon = 1e-6) const;
-
-public:
-
-    /** Normalize the quaternion */
-    aiQuaterniont& Normalize();
-
-    /** Compute quaternion conjugate */
-    aiQuaterniont& Conjugate ();
-
-    /** Rotate a point by this quaternion */
-    aiVector3t<TReal> Rotate (const aiVector3t<TReal>& in);
-
-    /** Multiply two quaternions */
-    aiQuaterniont operator* (const aiQuaterniont& two) const;
-
-public:
-
-    /** Performs a spherical interpolation between two quaternions and writes the result into the third.
-     * @param pOut Target object to received the interpolated rotation.
-     * @param pStart Start rotation of the interpolation at factor == 0.
-     * @param pEnd End rotation, factor == 1.
-     * @param pFactor Interpolation factor between 0 and 1. Values outside of this range yield undefined results.
-     */
-    static void Interpolate( aiQuaterniont& pOut, const aiQuaterniont& pStart,
-        const aiQuaterniont& pEnd, TReal pFactor);
-
-public:
-
-    //! w,x,y,z components of the quaternion
-    TReal w, x, y, z;
-} ;
-
-typedef aiQuaterniont<ai_real> aiQuaternion;
-
-#else
-
-struct aiQuaternion {
-    ai_real w, x, y, z;
-};
-
-#endif
-
-#endif // AI_QUATERNION_H_INC
diff --git a/thirdparty/assimp/include/assimp/quaternion.inl b/thirdparty/assimp/include/assimp/quaternion.inl
deleted file mode 100644
index 3ce514d1bb..0000000000
--- a/thirdparty/assimp/include/assimp/quaternion.inl
+++ /dev/null
@@ -1,290 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  quaternion.inl
- *  @brief Inline implementation of aiQuaterniont<TReal> operators
- */
-#pragma once
-#ifndef AI_QUATERNION_INL_INC
-#define AI_QUATERNION_INL_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef __cplusplus
-#include <assimp/quaternion.h>
-
-#include <cmath>
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-bool aiQuaterniont<TReal>::operator== (const aiQuaterniont& o) const
-{
-    return x == o.x && y == o.y && z == o.z && w == o.w;
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-bool aiQuaterniont<TReal>::operator!= (const aiQuaterniont& o) const
-{
-    return !(*this == o);
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-inline bool aiQuaterniont<TReal>::Equal(const aiQuaterniont& o, TReal epsilon) const {
-    return
-        std::abs(x - o.x) <= epsilon &&
-        std::abs(y - o.y) <= epsilon &&
-        std::abs(z - o.z) <= epsilon &&
-        std::abs(w - o.w) <= epsilon;
-}
-
-// ---------------------------------------------------------------------------
-// Constructs a quaternion from a rotation matrix
-template<typename TReal>
-inline aiQuaterniont<TReal>::aiQuaterniont( const aiMatrix3x3t<TReal> &pRotMatrix)
-{
-    TReal t = pRotMatrix.a1 + pRotMatrix.b2 + pRotMatrix.c3;
-
-    // large enough
-    if( t > static_cast<TReal>(0))
-    {
-        TReal s = std::sqrt(1 + t) * static_cast<TReal>(2.0);
-        x = (pRotMatrix.c2 - pRotMatrix.b3) / s;
-        y = (pRotMatrix.a3 - pRotMatrix.c1) / s;
-        z = (pRotMatrix.b1 - pRotMatrix.a2) / s;
-        w = static_cast<TReal>(0.25) * s;
-    } // else we have to check several cases
-    else if( pRotMatrix.a1 > pRotMatrix.b2 && pRotMatrix.a1 > pRotMatrix.c3 )
-    {
-        // Column 0:
-        TReal s = std::sqrt( static_cast<TReal>(1.0) + pRotMatrix.a1 - pRotMatrix.b2 - pRotMatrix.c3) * static_cast<TReal>(2.0);
-        x = static_cast<TReal>(0.25) * s;
-        y = (pRotMatrix.b1 + pRotMatrix.a2) / s;
-        z = (pRotMatrix.a3 + pRotMatrix.c1) / s;
-        w = (pRotMatrix.c2 - pRotMatrix.b3) / s;
-    }
-    else if( pRotMatrix.b2 > pRotMatrix.c3)
-    {
-        // Column 1:
-        TReal s = std::sqrt( static_cast<TReal>(1.0) + pRotMatrix.b2 - pRotMatrix.a1 - pRotMatrix.c3) * static_cast<TReal>(2.0);
-        x = (pRotMatrix.b1 + pRotMatrix.a2) / s;
-        y = static_cast<TReal>(0.25) * s;
-        z = (pRotMatrix.c2 + pRotMatrix.b3) / s;
-        w = (pRotMatrix.a3 - pRotMatrix.c1) / s;
-    } else
-    {
-        // Column 2:
-        TReal s = std::sqrt( static_cast<TReal>(1.0) + pRotMatrix.c3 - pRotMatrix.a1 - pRotMatrix.b2) * static_cast<TReal>(2.0);
-        x = (pRotMatrix.a3 + pRotMatrix.c1) / s;
-        y = (pRotMatrix.c2 + pRotMatrix.b3) / s;
-        z = static_cast<TReal>(0.25) * s;
-        w = (pRotMatrix.b1 - pRotMatrix.a2) / s;
-    }
-}
-
-// ---------------------------------------------------------------------------
-// Construction from euler angles
-template<typename TReal>
-inline aiQuaterniont<TReal>::aiQuaterniont( TReal fPitch, TReal fYaw, TReal fRoll )
-{
-    const TReal fSinPitch(std::sin(fPitch*static_cast<TReal>(0.5)));
-    const TReal fCosPitch(std::cos(fPitch*static_cast<TReal>(0.5)));
-    const TReal fSinYaw(std::sin(fYaw*static_cast<TReal>(0.5)));
-    const TReal fCosYaw(std::cos(fYaw*static_cast<TReal>(0.5)));
-    const TReal fSinRoll(std::sin(fRoll*static_cast<TReal>(0.5)));
-    const TReal fCosRoll(std::cos(fRoll*static_cast<TReal>(0.5)));
-    const TReal fCosPitchCosYaw(fCosPitch*fCosYaw);
-    const TReal fSinPitchSinYaw(fSinPitch*fSinYaw);
-    x = fSinRoll * fCosPitchCosYaw     - fCosRoll * fSinPitchSinYaw;
-    y = fCosRoll * fSinPitch * fCosYaw + fSinRoll * fCosPitch * fSinYaw;
-    z = fCosRoll * fCosPitch * fSinYaw - fSinRoll * fSinPitch * fCosYaw;
-    w = fCosRoll * fCosPitchCosYaw     + fSinRoll * fSinPitchSinYaw;
-}
-
-// ---------------------------------------------------------------------------
-// Returns a matrix representation of the quaternion
-template<typename TReal>
-inline aiMatrix3x3t<TReal> aiQuaterniont<TReal>::GetMatrix() const
-{
-    aiMatrix3x3t<TReal> resMatrix;
-    resMatrix.a1 = static_cast<TReal>(1.0) - static_cast<TReal>(2.0) * (y * y + z * z);
-    resMatrix.a2 = static_cast<TReal>(2.0) * (x * y - z * w);
-    resMatrix.a3 = static_cast<TReal>(2.0) * (x * z + y * w);
-    resMatrix.b1 = static_cast<TReal>(2.0) * (x * y + z * w);
-    resMatrix.b2 = static_cast<TReal>(1.0) - static_cast<TReal>(2.0) * (x * x + z * z);
-    resMatrix.b3 = static_cast<TReal>(2.0) * (y * z - x * w);
-    resMatrix.c1 = static_cast<TReal>(2.0) * (x * z - y * w);
-    resMatrix.c2 = static_cast<TReal>(2.0) * (y * z + x * w);
-    resMatrix.c3 = static_cast<TReal>(1.0) - static_cast<TReal>(2.0) * (x * x + y * y);
-
-    return resMatrix;
-}
-
-// ---------------------------------------------------------------------------
-// Construction from an axis-angle pair
-template<typename TReal>
-inline aiQuaterniont<TReal>::aiQuaterniont( aiVector3t<TReal> axis, TReal angle)
-{
-    axis.Normalize();
-
-    const TReal sin_a = std::sin( angle / 2 );
-    const TReal cos_a = std::cos( angle / 2 );
-    x    = axis.x * sin_a;
-    y    = axis.y * sin_a;
-    z    = axis.z * sin_a;
-    w    = cos_a;
-}
-// ---------------------------------------------------------------------------
-// Construction from am existing, normalized quaternion
-template<typename TReal>
-inline aiQuaterniont<TReal>::aiQuaterniont( aiVector3t<TReal> normalized)
-{
-    x = normalized.x;
-    y = normalized.y;
-    z = normalized.z;
-
-    const TReal t = static_cast<TReal>(1.0) - (x*x) - (y*y) - (z*z);
-
-    if (t < static_cast<TReal>(0.0)) {
-        w = static_cast<TReal>(0.0);
-    }
-    else w = std::sqrt (t);
-}
-
-// ---------------------------------------------------------------------------
-// Performs a spherical interpolation between two quaternions
-// Implementation adopted from the gmtl project. All others I found on the net fail in some cases.
-// Congrats, gmtl!
-template<typename TReal>
-inline void aiQuaterniont<TReal>::Interpolate( aiQuaterniont& pOut, const aiQuaterniont& pStart, const aiQuaterniont& pEnd, TReal pFactor)
-{
-    // calc cosine theta
-    TReal cosom = pStart.x * pEnd.x + pStart.y * pEnd.y + pStart.z * pEnd.z + pStart.w * pEnd.w;
-
-    // adjust signs (if necessary)
-    aiQuaterniont end = pEnd;
-    if( cosom < static_cast<TReal>(0.0))
-    {
-        cosom = -cosom;
-        end.x = -end.x;   // Reverse all signs
-        end.y = -end.y;
-        end.z = -end.z;
-        end.w = -end.w;
-    }
-
-    // Calculate coefficients
-    TReal sclp, sclq;
-    if( (static_cast<TReal>(1.0) - cosom) > static_cast<TReal>(0.0001)) // 0.0001 -> some epsillon
-    {
-        // Standard case (slerp)
-        TReal omega, sinom;
-        omega = std::acos( cosom); // extract theta from dot product's cos theta
-        sinom = std::sin( omega);
-        sclp  = std::sin( (static_cast<TReal>(1.0) - pFactor) * omega) / sinom;
-        sclq  = std::sin( pFactor * omega) / sinom;
-    } else
-    {
-        // Very close, do linear interp (because it's faster)
-        sclp = static_cast<TReal>(1.0) - pFactor;
-        sclq = pFactor;
-    }
-
-    pOut.x = sclp * pStart.x + sclq * end.x;
-    pOut.y = sclp * pStart.y + sclq * end.y;
-    pOut.z = sclp * pStart.z + sclq * end.z;
-    pOut.w = sclp * pStart.w + sclq * end.w;
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-inline aiQuaterniont<TReal>& aiQuaterniont<TReal>::Normalize()
-{
-    // compute the magnitude and divide through it
-    const TReal mag = std::sqrt(x*x + y*y + z*z + w*w);
-    if (mag)
-    {
-        const TReal invMag = static_cast<TReal>(1.0)/mag;
-        x *= invMag;
-        y *= invMag;
-        z *= invMag;
-        w *= invMag;
-    }
-    return *this;
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-inline aiQuaterniont<TReal> aiQuaterniont<TReal>::operator* (const aiQuaterniont& t) const
-{
-    return aiQuaterniont(w*t.w - x*t.x - y*t.y - z*t.z,
-        w*t.x + x*t.w + y*t.z - z*t.y,
-        w*t.y + y*t.w + z*t.x - x*t.z,
-        w*t.z + z*t.w + x*t.y - y*t.x);
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-inline aiQuaterniont<TReal>& aiQuaterniont<TReal>::Conjugate ()
-{
-    x = -x;
-    y = -y;
-    z = -z;
-    return *this;
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-inline aiVector3t<TReal> aiQuaterniont<TReal>::Rotate (const aiVector3t<TReal>& v)
-{
-    aiQuaterniont q2(0.f,v.x,v.y,v.z), q = *this, qinv = q;
-    qinv.Conjugate();
-
-    q = q*q2*qinv;
-    return aiVector3t<TReal>(q.x,q.y,q.z);
-}
-
-#endif
-#endif // AI_QUATERNION_INL_INC
diff --git a/thirdparty/assimp/include/assimp/scene.h b/thirdparty/assimp/include/assimp/scene.h
deleted file mode 100644
index b76709eb15..0000000000
--- a/thirdparty/assimp/include/assimp/scene.h
+++ /dev/null
@@ -1,429 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file scene.h
- *  @brief Defines the data structures in which the imported scene is returned.
- */
-#pragma once
-#ifndef AI_SCENE_H_INC
-#define AI_SCENE_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-#include <assimp/texture.h>
-#include <assimp/mesh.h>
-#include <assimp/light.h>
-#include <assimp/camera.h>
-#include <assimp/material.h>
-#include <assimp/anim.h>
-#include <assimp/metadata.h>
-
-#ifdef __cplusplus
-#  include <cstdlib>
-extern "C" {
-#endif
-
-#ifdef __GNUC__
-#pragma GCC diagnostic push
-#pragma GCC diagnostic ignored "-Wattributes"
-#endif
-
-// -------------------------------------------------------------------------------
-/** 
- * A node in the imported hierarchy.
- *
- * Each node has name, a parent node (except for the root node),
- * a transformation relative to its parent and possibly several child nodes.
- * Simple file formats don't support hierarchical structures - for these formats
- * the imported scene does consist of only a single root node without children.
- */
-// -------------------------------------------------------------------------------
-struct ASSIMP_API aiNode
-{
-    /** The name of the node.
-     *
-     * The name might be empty (length of zero) but all nodes which
-     * need to be referenced by either bones or animations are named.
-     * Multiple nodes may have the same name, except for nodes which are referenced
-     * by bones (see #aiBone and #aiMesh::mBones). Their names *must* be unique.
-     *
-     * Cameras and lights reference a specific node by name - if there
-     * are multiple nodes with this name, they are assigned to each of them.
-     * <br>
-     * There are no limitations with regard to the characters contained in
-     * the name string as it is usually taken directly from the source file.
-     *
-     * Implementations should be able to handle tokens such as whitespace, tabs,
-     * line feeds, quotation marks, ampersands etc.
-     *
-     * Sometimes assimp introduces new nodes not present in the source file
-     * into the hierarchy (usually out of necessity because sometimes the
-     * source hierarchy format is simply not compatible). Their names are
-     * surrounded by @verbatim <> @endverbatim e.g.
-     *  @verbatim<DummyRootNode> @endverbatim.
-     */
-    C_STRUCT aiString mName;
-
-    /** The transformation relative to the node's parent. */
-    C_STRUCT aiMatrix4x4 mTransformation;
-
-    /** Parent node. nullptr if this node is the root node. */
-    C_STRUCT aiNode* mParent;
-
-    /** The number of child nodes of this node. */
-    unsigned int mNumChildren;
-
-    /** The child nodes of this node. nullptr if mNumChildren is 0. */
-    C_STRUCT aiNode** mChildren;
-
-    /** The number of meshes of this node. */
-    unsigned int mNumMeshes;
-
-    /** The meshes of this node. Each entry is an index into the
-      * mesh list of the #aiScene.
-      */
-    unsigned int* mMeshes;
-
-    /** Metadata associated with this node or nullptr if there is no metadata.
-      *  Whether any metadata is generated depends on the source file format. See the
-      * @link importer_notes @endlink page for more information on every source file
-      * format. Importers that don't document any metadata don't write any.
-      */
-    C_STRUCT aiMetadata* mMetaData;
-
-#ifdef __cplusplus
-    /** Constructor */
-    aiNode();
-
-    /** Construction from a specific name */
-    explicit aiNode(const std::string& name);
-
-    /** Destructor */
-    ~aiNode();
-
-    /** Searches for a node with a specific name, beginning at this
-     *  nodes. Normally you will call this method on the root node
-     *  of the scene.
-     *
-     *  @param name Name to search for
-     *  @return nullptr or a valid Node if the search was successful.
-     */
-    inline 
-    const aiNode* FindNode(const aiString& name) const {
-        return FindNode(name.data);
-    }
-
-    inline 
-    aiNode* FindNode(const aiString& name) {
-        return FindNode(name.data);
-    }
-
-    const aiNode* FindNode(const char* name) const;
-
-    aiNode* FindNode(const char* name);
-
-    /**
-     * @brief   Will add new children.
-     * @param   numChildren  Number of children to add.
-     * @param   children     The array with pointers showing to the children.
-     */
-    void addChildren(unsigned int numChildren, aiNode **children);
-#endif // __cplusplus
-};
-
-#ifdef __GNUC__
-#pragma GCC diagnostic pop
-#endif
-
-// -------------------------------------------------------------------------------
-/**
- * Specifies that the scene data structure that was imported is not complete.
- * This flag bypasses some internal validations and allows the import
- * of animation skeletons, material libraries or camera animation paths
- * using Assimp. Most applications won't support such data.
- */
-#define AI_SCENE_FLAGS_INCOMPLETE   0x1
-
-/**
- * This flag is set by the validation postprocess-step (aiPostProcess_ValidateDS)
- * if the validation is successful. In a validated scene you can be sure that
- * any cross references in the data structure (e.g. vertex indices) are valid.
- */
-#define AI_SCENE_FLAGS_VALIDATED    0x2
-
-/**
- * This flag is set by the validation postprocess-step (aiPostProcess_ValidateDS)
- * if the validation is successful but some issues have been found.
- * This can for example mean that a texture that does not exist is referenced
- * by a material or that the bone weights for a vertex don't sum to 1.0 ... .
- * In most cases you should still be able to use the import. This flag could
- * be useful for applications which don't capture Assimp's log output.
- */
-#define AI_SCENE_FLAGS_VALIDATION_WARNING   0x4
-
-/**
- * This flag is currently only set by the aiProcess_JoinIdenticalVertices step.
- * It indicates that the vertices of the output meshes aren't in the internal
- * verbose format anymore. In the verbose format all vertices are unique,
- * no vertex is ever referenced by more than one face.
- */
-#define AI_SCENE_FLAGS_NON_VERBOSE_FORMAT   0x8
-
- /**
- * Denotes pure height-map terrain data. Pure terrains usually consist of quads,
- * sometimes triangles, in a regular grid. The x,y coordinates of all vertex
- * positions refer to the x,y coordinates on the terrain height map, the z-axis
- * stores the elevation at a specific point.
- *
- * TER (Terragen) and HMP (3D Game Studio) are height map formats.
- * @note Assimp is probably not the best choice for loading *huge* terrains -
- * fully triangulated data takes extremely much free store and should be avoided
- * as long as possible (typically you'll do the triangulation when you actually
- * need to render it).
- */
-#define AI_SCENE_FLAGS_TERRAIN 0x10
-
- /**
- * Specifies that the scene data can be shared between structures. For example:
- * one vertex in few faces. \ref AI_SCENE_FLAGS_NON_VERBOSE_FORMAT can not be
- * used for this because \ref AI_SCENE_FLAGS_NON_VERBOSE_FORMAT has internal
- * meaning about postprocessing steps.
- */
-#define AI_SCENE_FLAGS_ALLOW_SHARED			0x20
-
-// -------------------------------------------------------------------------------
-/** The root structure of the imported data.
- *
- *  Everything that was imported from the given file can be accessed from here.
- *  Objects of this class are generally maintained and owned by Assimp, not
- *  by the caller. You shouldn't want to instance it, nor should you ever try to
- *  delete a given scene on your own.
- */
-// -------------------------------------------------------------------------------
-struct aiScene
-{
-    /** Any combination of the AI_SCENE_FLAGS_XXX flags. By default
-    * this value is 0, no flags are set. Most applications will
-    * want to reject all scenes with the AI_SCENE_FLAGS_INCOMPLETE
-    * bit set.
-    */
-    unsigned int mFlags;
-
-    /** The root node of the hierarchy.
-    *
-    * There will always be at least the root node if the import
-    * was successful (and no special flags have been set).
-    * Presence of further nodes depends on the format and content
-    * of the imported file.
-    */
-    C_STRUCT aiNode* mRootNode;
-
-    /** The number of meshes in the scene. */
-    unsigned int mNumMeshes;
-
-    /** The array of meshes.
-    *
-    * Use the indices given in the aiNode structure to access
-    * this array. The array is mNumMeshes in size. If the
-    * AI_SCENE_FLAGS_INCOMPLETE flag is not set there will always
-    * be at least ONE material.
-    */
-    C_STRUCT aiMesh** mMeshes;
-
-    /** The number of materials in the scene. */
-    unsigned int mNumMaterials;
-
-    /** The array of materials.
-    *
-    * Use the index given in each aiMesh structure to access this
-    * array. The array is mNumMaterials in size. If the
-    * AI_SCENE_FLAGS_INCOMPLETE flag is not set there will always
-    * be at least ONE material.
-    */
-    C_STRUCT aiMaterial** mMaterials;
-
-    /** The number of animations in the scene. */
-    unsigned int mNumAnimations;
-
-    /** The array of animations.
-    *
-    * All animations imported from the given file are listed here.
-    * The array is mNumAnimations in size.
-    */
-    C_STRUCT aiAnimation** mAnimations;
-
-    /** The number of textures embedded into the file */
-    unsigned int mNumTextures;
-
-    /** The array of embedded textures.
-    *
-    * Not many file formats embed their textures into the file.
-    * An example is Quake's MDL format (which is also used by
-    * some GameStudio versions)
-    */
-    C_STRUCT aiTexture** mTextures;
-
-    /** The number of light sources in the scene. Light sources
-    * are fully optional, in most cases this attribute will be 0
-        */
-    unsigned int mNumLights;
-
-    /** The array of light sources.
-    *
-    * All light sources imported from the given file are
-    * listed here. The array is mNumLights in size.
-    */
-    C_STRUCT aiLight** mLights;
-
-    /** The number of cameras in the scene. Cameras
-    * are fully optional, in most cases this attribute will be 0
-        */
-    unsigned int mNumCameras;
-
-    /** The array of cameras.
-    *
-    * All cameras imported from the given file are listed here.
-    * The array is mNumCameras in size. The first camera in the
-    * array (if existing) is the default camera view into
-    * the scene.
-    */
-    C_STRUCT aiCamera** mCameras;
-
-    /**
-     *  @brief  The global metadata assigned to the scene itself.
-     *
-     *  This data contains global metadata which belongs to the scene like 
-     *  unit-conversions, versions, vendors or other model-specific data. This 
-     *  can be used to store format-specific metadata as well.
-     */
-    C_STRUCT aiMetadata* mMetaData;
-
-
-#ifdef __cplusplus
-
-    //! Default constructor - set everything to 0/nullptr
-    ASSIMP_API aiScene();
-
-    //! Destructor
-    ASSIMP_API ~aiScene();
-
-    //! Check whether the scene contains meshes
-    //! Unless no special scene flags are set this will always be true.
-    inline bool HasMeshes() const { 
-        return mMeshes != nullptr && mNumMeshes > 0; 
-    }
-
-    //! Check whether the scene contains materials
-    //! Unless no special scene flags are set this will always be true.
-    inline bool HasMaterials() const { 
-        return mMaterials != nullptr && mNumMaterials > 0; 
-    }
-
-    //! Check whether the scene contains lights
-    inline bool HasLights() const { 
-        return mLights != nullptr && mNumLights > 0; 
-    }
-
-    //! Check whether the scene contains textures
-    inline bool HasTextures() const {
-        return mTextures != nullptr && mNumTextures > 0; 
-    }
-
-    //! Check whether the scene contains cameras
-    inline bool HasCameras() const {
-        return mCameras != nullptr && mNumCameras > 0; 
-    }
-
-    //! Check whether the scene contains animations
-    inline bool HasAnimations() const { 
-        return mAnimations != nullptr && mNumAnimations > 0; 
-    }
-
-    //! Returns a short filename from a full path
-    static const char* GetShortFilename(const char* filename) {
-        const char* lastSlash = strrchr(filename, '/');
-        if (lastSlash == nullptr) {
-            lastSlash = strrchr(filename, '\\');
-        }
-        const char* shortFilename = lastSlash != nullptr ? lastSlash + 1 : filename;
-        return shortFilename;
-    }
-
-    //! Returns an embedded texture
-    const aiTexture* GetEmbeddedTexture(const char* filename) const {
-        // lookup using texture ID (if referenced like: "*1", "*2", etc.)
-        if ('*' == *filename) {
-            int index = std::atoi(filename + 1);
-            if (0 > index || mNumTextures <= static_cast<unsigned>(index))
-                return nullptr;
-            return mTextures[index];
-        }
-        // lookup using filename
-        const char* shortFilename = GetShortFilename(filename);
-        for (unsigned int i = 0; i < mNumTextures; i++) {
-            const char* shortTextureFilename = GetShortFilename(mTextures[i]->mFilename.C_Str());
-            if (strcmp(shortTextureFilename, shortFilename) == 0) {
-                return mTextures[i];
-            }
-        }
-        return nullptr;
-    }
-#endif // __cplusplus
-
-    /**  Internal data, do not touch */
-#ifdef __cplusplus
-    void* mPrivate;
-#else
-    char* mPrivate;
-#endif
-
-};
-
-#ifdef __cplusplus
-} //! namespace Assimp
-#endif
-
-#endif // AI_SCENE_H_INC
diff --git a/thirdparty/assimp/include/assimp/texture.h b/thirdparty/assimp/include/assimp/texture.h
deleted file mode 100644
index 0867659f46..0000000000
--- a/thirdparty/assimp/include/assimp/texture.h
+++ /dev/null
@@ -1,226 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file texture.h
- *  @brief Defines texture helper structures for the library
- *
- * Used for file formats which embed their textures into the model file.
- * Supported are both normal textures, which are stored as uncompressed
- * pixels, and "compressed" textures, which are stored in a file format
- * such as PNG or TGA.
- */
-#pragma once
-#ifndef AI_TEXTURE_H_INC
-#define AI_TEXTURE_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#include <assimp/types.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// --------------------------------------------------------------------------------
-
-/** \def AI_EMBEDDED_TEXNAME_PREFIX
- * \ref AI_MAKE_EMBEDDED_TEXNAME
- */
-#ifndef AI_EMBEDDED_TEXNAME_PREFIX
-#   define AI_EMBEDDED_TEXNAME_PREFIX	"*"
-#endif
-
-/** @def AI_MAKE_EMBEDDED_TEXNAME
- *  Used to build the reserved path name used by the material system to
- *  reference textures that are embedded into their corresponding
- *  model files. The parameter specifies the index of the texture
- *  (zero-based, in the aiScene::mTextures array)
- */
-#if (!defined AI_MAKE_EMBEDDED_TEXNAME)
-#   define AI_MAKE_EMBEDDED_TEXNAME(_n_) AI_EMBEDDED_TEXNAME_PREFIX # _n_
-#endif
-
-#include "./Compiler/pushpack1.h"
-
-// --------------------------------------------------------------------------------
-/** @brief Helper structure to represent a texel in a ARGB8888 format
-*
-*  Used by aiTexture.
-*/
-struct aiTexel {
-    unsigned char b,g,r,a;
-
-#ifdef __cplusplus
-    //! Comparison operator
-    bool operator== (const aiTexel& other) const
-    {
-        return b == other.b && r == other.r &&
-               g == other.g && a == other.a;
-    }
-
-    //! Inverse comparison operator
-    bool operator!= (const aiTexel& other) const
-    {
-        return b != other.b || r != other.r ||
-               g != other.g || a != other.a;
-    }
-
-    //! Conversion to a floating-point 4d color
-    operator aiColor4D() const
-    {
-        return aiColor4D(r/255.f,g/255.f,b/255.f,a/255.f);
-    }
-#endif // __cplusplus
-
-} PACK_STRUCT;
-
-#include "./Compiler/poppack1.h"
-
-#define HINTMAXTEXTURELEN 9
-
-// --------------------------------------------------------------------------------
-/** Helper structure to describe an embedded texture
- *
- * Normally textures are contained in external files but some file formats embed
- * them directly in the model file. There are two types of embedded textures:
- * 1. Uncompressed textures. The color data is given in an uncompressed format.
- * 2. Compressed textures stored in a file format like png or jpg. The raw file
- * bytes are given so the application must utilize an image decoder (e.g. DevIL) to
- * get access to the actual color data.
- *
- * Embedded textures are referenced from materials using strings like "*0", "*1", etc.
- * as the texture paths (a single asterisk character followed by the
- * zero-based index of the texture in the aiScene::mTextures array).
- */
-struct aiTexture {
-    /** Width of the texture, in pixels
-     *
-     * If mHeight is zero the texture is compressed in a format
-     * like JPEG. In this case mWidth specifies the size of the
-     * memory area pcData is pointing to, in bytes.
-     */
-    unsigned int mWidth;
-
-    /** Height of the texture, in pixels
-     *
-     * If this value is zero, pcData points to an compressed texture
-     * in any format (e.g. JPEG).
-     */
-    unsigned int mHeight;
-
-    /** A hint from the loader to make it easier for applications
-     *  to determine the type of embedded textures.
-     *
-     * If mHeight != 0 this member is show how data is packed. Hint will consist of
-     * two parts: channel order and channel bitness (count of the bits for every
-     * color channel). For simple parsing by the viewer it's better to not omit
-     * absent color channel and just use 0 for bitness. For example:
-     * 1. Image contain RGBA and 8 bit per channel, achFormatHint == "rgba8888";
-     * 2. Image contain ARGB and 8 bit per channel, achFormatHint == "argb8888";
-     * 3. Image contain RGB and 5 bit for R and B channels and 6 bit for G channel, achFormatHint == "rgba5650";
-     * 4. One color image with B channel and 1 bit for it, achFormatHint == "rgba0010";
-     * If mHeight == 0 then achFormatHint is set set to '\\0\\0\\0\\0' if the loader has no additional
-     * information about the texture file format used OR the
-     * file extension of the format without a trailing dot. If there
-     * are multiple file extensions for a format, the shortest
-     * extension is chosen (JPEG maps to 'jpg', not to 'jpeg').
-     * E.g. 'dds\\0', 'pcx\\0', 'jpg\\0'.  All characters are lower-case.
-     * The fourth character will always be '\\0'.
-     */
-    char achFormatHint[ HINTMAXTEXTURELEN ];// 8 for string + 1 for terminator.
-
-    /** Data of the texture.
-     *
-     * Points to an array of mWidth * mHeight aiTexel's.
-     * The format of the texture data is always ARGB8888 to
-     * make the implementation for user of the library as easy
-     * as possible. If mHeight = 0 this is a pointer to a memory
-     * buffer of size mWidth containing the compressed texture
-     * data. Good luck, have fun!
-     */
-    C_STRUCT aiTexel* pcData;
-
-    /** Texture original filename
-    *
-    * Used to get the texture reference
-    */
-    C_STRUCT aiString mFilename;
-
-#ifdef __cplusplus
-
-    //! For compressed textures (mHeight == 0): compare the
-    //! format hint against a given string.
-    //! @param s Input string. 3 characters are maximally processed.
-    //!        Example values: "jpg", "png"
-    //! @return true if the given string matches the format hint
-    bool CheckFormat(const char* s) const {
-        if (nullptr == s) {
-            return false;
-        }
-
-		return (0 == ::strncmp(achFormatHint, s, sizeof(achFormatHint)));
-    }
-
-    // Construction
-    aiTexture() AI_NO_EXCEPT
-    : mWidth(0)
-    , mHeight(0)
-    , pcData(nullptr)
-    , mFilename() {
-        achFormatHint[0] = achFormatHint[1] = 0;
-        achFormatHint[2] = achFormatHint[3] = 0;
-    }
-
-    // Destruction
-    ~aiTexture () {
-        delete[] pcData;
-    }
-#endif
-};
-
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif // AI_TEXTURE_H_INC
diff --git a/thirdparty/assimp/include/assimp/types.h b/thirdparty/assimp/include/assimp/types.h
deleted file mode 100644
index e32cae331c..0000000000
--- a/thirdparty/assimp/include/assimp/types.h
+++ /dev/null
@@ -1,544 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file types.h
- *  Basic data types and primitives, such as vectors or colors.
- */
-#pragma once
-#ifndef AI_TYPES_H_INC
-#define AI_TYPES_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-// Some runtime headers
-#include <sys/types.h>
-#include <stddef.h>
-#include <string.h>
-#include <limits.h>
-#include <stdint.h>
-
-// Our compile configuration
-#include <assimp/defs.h>
-
-// Some types moved to separate header due to size of operators
-#include <assimp/vector3.h>
-#include <assimp/vector2.h>
-#include <assimp/color4.h>
-#include <assimp/matrix3x3.h>
-#include <assimp/matrix4x4.h>
-#include <assimp/quaternion.h>
-
-typedef int32_t ai_int32;
-typedef uint32_t ai_uint32 ;
-
-#ifdef __cplusplus
-#include <cstring>
-#include <new>      // for std::nothrow_t
-#include <string>   // for aiString::Set(const std::string&)
-
-namespace Assimp    {
-//! @cond never
-namespace Intern        {
-    // --------------------------------------------------------------------
-    /** @brief Internal helper class to utilize our internal new/delete
-     *    routines for allocating object of this and derived classes.
-     *
-     * By doing this you can safely share class objects between Assimp
-     * and the application - it works even over DLL boundaries. A good
-     * example is the #IOSystem where the application allocates its custom
-     * #IOSystem, then calls #Importer::SetIOSystem(). When the Importer
-     * destructs, Assimp calls operator delete on the stored #IOSystem.
-     * If it lies on a different heap than Assimp is working with,
-     * the application is determined to crash.
-     */
-    // --------------------------------------------------------------------
-#ifndef SWIG
-    struct ASSIMP_API AllocateFromAssimpHeap    {
-        // http://www.gotw.ca/publications/mill15.htm
-
-        // new/delete overload
-        void *operator new    ( size_t num_bytes) /* throw( std::bad_alloc ) */;
-        void *operator new    ( size_t num_bytes, const std::nothrow_t& ) throw();
-        void  operator delete ( void* data);
-
-        // array new/delete overload
-        void *operator new[]    ( size_t num_bytes) /* throw( std::bad_alloc ) */;
-        void *operator new[]    ( size_t num_bytes, const std::nothrow_t& )  throw();
-        void  operator delete[] ( void* data);
-
-    }; // struct AllocateFromAssimpHeap
-#endif
-} // namespace Intern
-    //! @endcond
-} // namespace Assimp
-
-extern "C" {
-#endif
-
-/** Maximum dimension for strings, ASSIMP strings are zero terminated. */
-#ifdef __cplusplus
-    static const size_t MAXLEN = 1024;
-#else
-#   define MAXLEN 1024
-#endif
-
-// ----------------------------------------------------------------------------------
-/** Represents a plane in a three-dimensional, euclidean space
-*/
-struct aiPlane {
-#ifdef __cplusplus
-    aiPlane () AI_NO_EXCEPT : a(0.f), b(0.f), c(0.f), d(0.f) {}
-    aiPlane (ai_real _a, ai_real _b, ai_real _c, ai_real _d)
-        : a(_a), b(_b), c(_c), d(_d) {}
-
-    aiPlane (const aiPlane& o) : a(o.a), b(o.b), c(o.c), d(o.d) {}
-
-#endif // !__cplusplus
-
-    //! Plane equation
-    ai_real a,b,c,d;
-}; // !struct aiPlane
-
-// ----------------------------------------------------------------------------------
-/** Represents a ray
-*/
-struct aiRay {
-#ifdef __cplusplus
-    aiRay () AI_NO_EXCEPT {}
-    aiRay (const aiVector3D& _pos, const aiVector3D& _dir)
-        : pos(_pos), dir(_dir) {}
-
-    aiRay (const aiRay& o) : pos (o.pos), dir (o.dir) {}
-
-#endif // !__cplusplus
-
-    //! Position and direction of the ray
-    C_STRUCT aiVector3D pos, dir;
-}; // !struct aiRay
-
-// ----------------------------------------------------------------------------------
-/** Represents a color in Red-Green-Blue space.
-*/
-struct aiColor3D
-{
-#ifdef __cplusplus
-    aiColor3D () AI_NO_EXCEPT : r(0.0f), g(0.0f), b(0.0f) {}
-    aiColor3D (ai_real _r, ai_real _g, ai_real _b) : r(_r), g(_g), b(_b) {}
-    explicit aiColor3D (ai_real _r) : r(_r), g(_r), b(_r) {}
-    aiColor3D (const aiColor3D& o) : r(o.r), g(o.g), b(o.b) {}
-
-	aiColor3D &operator=(const aiColor3D &o) {
-		r = o.r;
-		g = o.g;
-		b = o.b;
-		return *this;
-	}
-
-	/** Component-wise comparison */
-    // TODO: add epsilon?
-    bool operator == (const aiColor3D& other) const
-        {return r == other.r && g == other.g && b == other.b;}
-
-    /** Component-wise inverse comparison */
-    // TODO: add epsilon?
-    bool operator != (const aiColor3D& other) const
-        {return r != other.r || g != other.g || b != other.b;}
-
-    /** Component-wise comparison */
-    // TODO: add epsilon?
-    bool operator < (const aiColor3D& other) const {
-        return r < other.r || ( r == other.r && (g < other.g || (g == other.g && b < other.b ) ) );
-    }
-
-    /** Component-wise addition */
-    aiColor3D operator+(const aiColor3D& c) const {
-        return aiColor3D(r+c.r,g+c.g,b+c.b);
-    }
-
-    /** Component-wise subtraction */
-    aiColor3D operator-(const aiColor3D& c) const {
-        return aiColor3D(r-c.r,g-c.g,b-c.b);
-    }
-
-    /** Component-wise multiplication */
-    aiColor3D operator*(const aiColor3D& c) const {
-        return aiColor3D(r*c.r,g*c.g,b*c.b);
-    }
-
-    /** Multiply with a scalar */
-    aiColor3D operator*(ai_real f) const {
-        return aiColor3D(r*f,g*f,b*f);
-    }
-
-    /** Access a specific color component */
-    ai_real operator[](unsigned int i) const {
-        return *(&r + i);
-    }
-
-    /** Access a specific color component */
-    ai_real& operator[](unsigned int i) {
-        if ( 0 == i ) {
-            return r;
-        } else if ( 1 == i ) {
-            return g;
-        } else if ( 2 == i ) {
-            return b;
-        }
-        return r;
-    }
-
-    /** Check whether a color is black */
-    bool IsBlack() const {
-        static const ai_real epsilon = ai_real(10e-3);
-        return std::fabs( r ) < epsilon && std::fabs( g ) < epsilon && std::fabs( b ) < epsilon;
-    }
-
-#endif // !__cplusplus
-
-    //! Red, green and blue color values
-    ai_real r, g, b;
-};  // !struct aiColor3D
-
-// ----------------------------------------------------------------------------------
-/** Represents an UTF-8 string, zero byte terminated.
- *
- *  The character set of an aiString is explicitly defined to be UTF-8. This Unicode
- *  transformation was chosen in the belief that most strings in 3d files are limited
- *  to ASCII, thus the character set needed to be strictly ASCII compatible.
- *
- *  Most text file loaders provide proper Unicode input file handling, special unicode
- *  characters are correctly transcoded to UTF8 and are kept throughout the libraries'
- *  import pipeline.
- *
- *  For most applications, it will be absolutely sufficient to interpret the
- *  aiString as ASCII data and work with it as one would work with a plain char*.
- *  Windows users in need of proper support for i.e asian characters can use the
- *  MultiByteToWideChar(), WideCharToMultiByte() WinAPI functionality to convert the
- *  UTF-8 strings to their working character set (i.e. MBCS, WideChar).
- *
- *  We use this representation instead of std::string to be C-compatible. The
- *  (binary) length of such a string is limited to MAXLEN characters (including the
- *  the terminating zero).
-*/
-struct aiString
-{
-#ifdef __cplusplus
-    /** Default constructor, the string is set to have zero length */
-    aiString() AI_NO_EXCEPT
-    : length( 0 ) {
-        data[0] = '\0';
-
-#ifdef ASSIMP_BUILD_DEBUG
-        // Debug build: overwrite the string on its full length with ESC (27)
-        memset(data+1,27,MAXLEN-1);
-#endif
-    }
-
-    /** Copy constructor */
-    aiString(const aiString& rOther)
-    : length(rOther.length)
-    {
-        // Crop the string to the maximum length
-        length = length>=MAXLEN?MAXLEN-1:length;
-        memcpy( data, rOther.data, length);
-        data[length] = '\0';
-    }
-
-    /** Constructor from std::string */
-    explicit aiString(const std::string& pString) :
-        length( (ai_uint32) pString.length())
-    {
-        length = length>=MAXLEN?MAXLEN-1:length;
-        memcpy( data, pString.c_str(), length);
-        data[length] = '\0';
-    }
-
-    /** Copy a std::string to the aiString */
-    void Set( const std::string& pString) {
-        if( pString.length() > MAXLEN - 1) {
-            return;
-        }
-        length = (ai_uint32)pString.length();
-        memcpy( data, pString.c_str(), length);
-        data[length] = 0;
-    }
-
-    /** Copy a const char* to the aiString */
-    void Set( const char* sz) {
-        const ai_int32 len = (ai_uint32) ::strlen(sz);
-        if( len > (ai_int32)MAXLEN - 1) {
-            return;
-        }
-        length = len;
-        memcpy( data, sz, len);
-        data[len] = 0;
-    }
-
-
-    /** Assignment operator */
-    aiString& operator = (const aiString &rOther) {
-        if (this == &rOther) {
-            return *this;
-        }
-
-        length = rOther.length;;
-        memcpy( data, rOther.data, length);
-        data[length] = '\0';
-        return *this;
-    }
-
-
-    /** Assign a const char* to the string */
-    aiString& operator = (const char* sz) {
-        Set(sz);
-        return *this;
-    }
-
-    /** Assign a cstd::string to the string */
-    aiString& operator = ( const std::string& pString) {
-        Set(pString);
-        return *this;
-    }
-
-    /** Comparison operator */
-    bool operator==(const aiString& other) const {
-        return  (length == other.length && 0 == memcmp(data,other.data,length));
-    }
-
-    /** Inverse comparison operator */
-    bool operator!=(const aiString& other) const {
-        return  (length != other.length || 0 != memcmp(data,other.data,length));
-    }
-
-    /** Append a string to the string */
-    void Append (const char* app)   {
-        const ai_uint32 len = (ai_uint32) ::strlen(app);
-        if (!len) {
-            return;
-        }
-        if (length + len >= MAXLEN) {
-            return;
-        }
-
-        memcpy(&data[length],app,len+1);
-        length += len;
-    }
-
-    /** Clear the string - reset its length to zero */
-    void Clear ()   {
-        length  = 0;
-        data[0] = '\0';
-
-#ifdef ASSIMP_BUILD_DEBUG
-        // Debug build: overwrite the string on its full length with ESC (27)
-        memset(data+1,27,MAXLEN-1);
-#endif
-    }
-
-    /** Returns a pointer to the underlying zero-terminated array of characters */
-    const char* C_Str() const {
-        return data;
-    }
-
-#endif // !__cplusplus
-
-    /** Binary length of the string excluding the terminal 0. This is NOT the
-     *  logical length of strings containing UTF-8 multi-byte sequences! It's
-     *  the number of bytes from the beginning of the string to its end.*/
-    ai_uint32 length;
-
-    /** String buffer. Size limit is MAXLEN */
-    char data[MAXLEN];
-} ;  // !struct aiString
-
-
-// ----------------------------------------------------------------------------------
-/** Standard return type for some library functions.
- * Rarely used, and if, mostly in the C API.
- */
-typedef enum aiReturn
-{
-    /** Indicates that a function was successful */
-    aiReturn_SUCCESS = 0x0,
-
-    /** Indicates that a function failed */
-    aiReturn_FAILURE = -0x1,
-
-    /** Indicates that not enough memory was available
-     * to perform the requested operation
-     */
-    aiReturn_OUTOFMEMORY = -0x3,
-
-    /** @cond never
-     *  Force 32-bit size enum
-     */
-    _AI_ENFORCE_ENUM_SIZE = 0x7fffffff
-
-    /// @endcond
-} aiReturn;  // !enum aiReturn
-
-// just for backwards compatibility, don't use these constants anymore
-#define AI_SUCCESS     aiReturn_SUCCESS
-#define AI_FAILURE     aiReturn_FAILURE
-#define AI_OUTOFMEMORY aiReturn_OUTOFMEMORY
-
-// ----------------------------------------------------------------------------------
-/** Seek origins (for the virtual file system API).
- *  Much cooler than using SEEK_SET, SEEK_CUR or SEEK_END.
- */
-enum aiOrigin
-{
-    /** Beginning of the file */
-    aiOrigin_SET = 0x0,
-
-    /** Current position of the file pointer */
-    aiOrigin_CUR = 0x1,
-
-    /** End of the file, offsets must be negative */
-    aiOrigin_END = 0x2,
-
-    /**  @cond never
-     *   Force 32-bit size enum
-     */
-    _AI_ORIGIN_ENFORCE_ENUM_SIZE = 0x7fffffff
-
-    /// @endcond
-}; // !enum aiOrigin
-
-// ----------------------------------------------------------------------------------
-/** @brief Enumerates predefined log streaming destinations.
- *  Logging to these streams can be enabled with a single call to
- *   #LogStream::createDefaultStream.
- */
-enum aiDefaultLogStream
-{
-    /** Stream the log to a file */
-    aiDefaultLogStream_FILE = 0x1,
-
-    /** Stream the log to std::cout */
-    aiDefaultLogStream_STDOUT = 0x2,
-
-    /** Stream the log to std::cerr */
-    aiDefaultLogStream_STDERR = 0x4,
-
-    /** MSVC only: Stream the log the the debugger
-     * (this relies on OutputDebugString from the Win32 SDK)
-     */
-    aiDefaultLogStream_DEBUGGER = 0x8,
-
-    /** @cond never
-     *  Force 32-bit size enum
-     */
-    _AI_DLS_ENFORCE_ENUM_SIZE = 0x7fffffff
-    /// @endcond
-}; // !enum aiDefaultLogStream
-
-// just for backwards compatibility, don't use these constants anymore
-#define DLS_FILE     aiDefaultLogStream_FILE
-#define DLS_STDOUT   aiDefaultLogStream_STDOUT
-#define DLS_STDERR   aiDefaultLogStream_STDERR
-#define DLS_DEBUGGER aiDefaultLogStream_DEBUGGER
-
-// ----------------------------------------------------------------------------------
-/** Stores the memory requirements for different components (e.g. meshes, materials,
- *  animations) of an import. All sizes are in bytes.
- *  @see Importer::GetMemoryRequirements()
-*/
-struct aiMemoryInfo
-{
-#ifdef __cplusplus
-
-    /** Default constructor */
-    aiMemoryInfo() AI_NO_EXCEPT
-        : textures   (0)
-        , materials  (0)
-        , meshes     (0)
-        , nodes      (0)
-        , animations (0)
-        , cameras    (0)
-        , lights     (0)
-        , total      (0)
-    {}
-
-#endif
-
-    /** Storage allocated for texture data */
-    unsigned int textures;
-
-    /** Storage allocated for material data  */
-    unsigned int materials;
-
-    /** Storage allocated for mesh data */
-    unsigned int meshes;
-
-    /** Storage allocated for node data */
-    unsigned int nodes;
-
-    /** Storage allocated for animation data */
-    unsigned int animations;
-
-    /** Storage allocated for camera data */
-    unsigned int cameras;
-
-    /** Storage allocated for light data */
-    unsigned int lights;
-
-    /** Total storage allocated for the full import. */
-    unsigned int total;
-}; // !struct aiMemoryInfo
-
-#ifdef __cplusplus
-}
-#endif //!  __cplusplus
-
-// Include implementation files
-#include "vector2.inl"
-#include "vector3.inl"
-#include "color4.inl"
-#include "quaternion.inl"
-#include "matrix3x3.inl"
-#include "matrix4x4.inl"
-
-#endif // AI_TYPES_H_INC
diff --git a/thirdparty/assimp/include/assimp/vector2.h b/thirdparty/assimp/include/assimp/vector2.h
deleted file mode 100644
index c8b1ebbbc2..0000000000
--- a/thirdparty/assimp/include/assimp/vector2.h
+++ /dev/null
@@ -1,111 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-/** @file vector2.h
- *  @brief 2D vector structure, including operators when compiling in C++
- */
-#pragma once
-#ifndef AI_VECTOR2D_H_INC
-#define AI_VECTOR2D_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef __cplusplus
-#   include <cmath>
-#else
-#   include <math.h>
-#endif
-
-#include "defs.h"
-
-// ----------------------------------------------------------------------------------
-/** Represents a two-dimensional vector.
- */
-
-#ifdef __cplusplus
-template <typename TReal>
-class aiVector2t {
-public:
-    aiVector2t () : x(), y() {}
-    aiVector2t (TReal _x, TReal _y) : x(_x), y(_y) {}
-    explicit aiVector2t (TReal _xyz) : x(_xyz), y(_xyz) {}
-    aiVector2t (const aiVector2t& o) = default;
-
-    void Set( TReal pX, TReal pY);
-    TReal SquareLength() const ;
-    TReal Length() const ;
-    aiVector2t& Normalize();
-
-    const aiVector2t& operator += (const aiVector2t& o);
-    const aiVector2t& operator -= (const aiVector2t& o);
-    const aiVector2t& operator *= (TReal f);
-    const aiVector2t& operator /= (TReal f);
-
-    TReal operator[](unsigned int i) const;
-
-    bool operator== (const aiVector2t& other) const;
-    bool operator!= (const aiVector2t& other) const;
-
-    bool Equal(const aiVector2t& other, TReal epsilon = 1e-6) const;
-
-    aiVector2t& operator= (TReal f);
-    const aiVector2t SymMul(const aiVector2t& o);
-
-    template <typename TOther>
-    operator aiVector2t<TOther> () const;
-
-    TReal x, y;
-};
-
-typedef aiVector2t<ai_real> aiVector2D;
-
-#else
-
-struct aiVector2D {
-    ai_real x, y;
-};
-
-#endif // __cplusplus
-
-#endif // AI_VECTOR2D_H_INC
diff --git a/thirdparty/assimp/include/assimp/vector2.inl b/thirdparty/assimp/include/assimp/vector2.inl
deleted file mode 100644
index 4bbf432ff8..0000000000
--- a/thirdparty/assimp/include/assimp/vector2.inl
+++ /dev/null
@@ -1,248 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  vector2.inl
- *  @brief Inline implementation of aiVector2t<TReal> operators
- */
-#pragma once
-#ifndef AI_VECTOR2D_INL_INC
-#define AI_VECTOR2D_INL_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef __cplusplus
-#include <assimp/vector2.h>
-
-#include <cmath>
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-template <typename TOther>
-aiVector2t<TReal>::operator aiVector2t<TOther> () const {
-    return aiVector2t<TOther>(static_cast<TOther>(x),static_cast<TOther>(y));
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-void aiVector2t<TReal>::Set( TReal pX, TReal pY) {
-    x = pX; y = pY;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-TReal aiVector2t<TReal>::SquareLength() const {
-    return x*x + y*y;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-TReal aiVector2t<TReal>::Length() const {
-    return std::sqrt( SquareLength());
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-aiVector2t<TReal>& aiVector2t<TReal>::Normalize() {
-    *this /= Length();
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-const aiVector2t<TReal>& aiVector2t<TReal>::operator += (const aiVector2t& o) {
-    x += o.x; y += o.y;
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-const aiVector2t<TReal>& aiVector2t<TReal>::operator -= (const aiVector2t& o) {
-    x -= o.x; y -= o.y;
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-const aiVector2t<TReal>& aiVector2t<TReal>::operator *= (TReal f) {
-    x *= f; y *= f;
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-const aiVector2t<TReal>& aiVector2t<TReal>::operator /= (TReal f) {
-    x /= f; y /= f;
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-TReal aiVector2t<TReal>::operator[](unsigned int i) const {
-	switch (i) {
-		case 0:
-			return x;
-		case 1:
-			return y;
-		default:
-			break;
-
-    }
-    return x;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-bool aiVector2t<TReal>::operator== (const aiVector2t& other) const {
-    return x == other.x && y == other.y;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-bool aiVector2t<TReal>::operator!= (const aiVector2t& other) const {
-    return x != other.x || y != other.y;
-}
-
-// ---------------------------------------------------------------------------
-template<typename TReal>
-inline
-bool aiVector2t<TReal>::Equal(const aiVector2t& other, TReal epsilon) const {
-    return
-        std::abs(x - other.x) <= epsilon &&
-        std::abs(y - other.y) <= epsilon;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-aiVector2t<TReal>& aiVector2t<TReal>::operator= (TReal f)   {
-    x = y = f;
-    return *this;
-}
-
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-inline
-const aiVector2t<TReal> aiVector2t<TReal>::SymMul(const aiVector2t& o) {
-    return aiVector2t(x*o.x,y*o.y);
-}
-
-
-// ------------------------------------------------------------------------------------------------
-// symmetric addition
-template <typename TReal>
-inline
-aiVector2t<TReal> operator + (const aiVector2t<TReal>& v1, const aiVector2t<TReal>& v2) {
-    return aiVector2t<TReal>( v1.x + v2.x, v1.y + v2.y);
-}
-
-// ------------------------------------------------------------------------------------------------
-// symmetric subtraction
-template <typename TReal>
-inline 
-aiVector2t<TReal> operator - (const aiVector2t<TReal>& v1, const aiVector2t<TReal>& v2) {
-    return aiVector2t<TReal>( v1.x - v2.x, v1.y - v2.y);
-}
-
-// ------------------------------------------------------------------------------------------------
-// scalar product
-template <typename TReal>
-inline 
-TReal operator * (const aiVector2t<TReal>& v1, const aiVector2t<TReal>& v2) {
-    return v1.x*v2.x + v1.y*v2.y;
-}
-
-// ------------------------------------------------------------------------------------------------
-// scalar multiplication
-template <typename TReal>
-inline 
-aiVector2t<TReal> operator * ( TReal f, const aiVector2t<TReal>& v) {
-    return aiVector2t<TReal>( f*v.x, f*v.y);
-}
-
-// ------------------------------------------------------------------------------------------------
-// and the other way around
-template <typename TReal>
-inline 
-aiVector2t<TReal> operator * ( const aiVector2t<TReal>& v, TReal f) {
-    return aiVector2t<TReal>( f*v.x, f*v.y);
-}
-
-// ------------------------------------------------------------------------------------------------
-// scalar division
-template <typename TReal>
-inline 
-aiVector2t<TReal> operator / ( const aiVector2t<TReal>& v, TReal f) {
-    return v * (1/f);
-}
-
-// ------------------------------------------------------------------------------------------------
-// vector division
-template <typename TReal>
-inline 
-aiVector2t<TReal> operator / ( const aiVector2t<TReal>& v, const aiVector2t<TReal>& v2) {
-    return aiVector2t<TReal>(v.x / v2.x,v.y / v2.y);
-}
-
-// ------------------------------------------------------------------------------------------------
-// vector negation
-template <typename TReal>
-inline 
-aiVector2t<TReal> operator - ( const aiVector2t<TReal>& v) {
-    return aiVector2t<TReal>( -v.x, -v.y);
-}
-
-#endif
-
-#endif // AI_VECTOR2D_INL_INC
diff --git a/thirdparty/assimp/include/assimp/vector3.h b/thirdparty/assimp/include/assimp/vector3.h
deleted file mode 100644
index fffeb12ad7..0000000000
--- a/thirdparty/assimp/include/assimp/vector3.h
+++ /dev/null
@@ -1,146 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-/** @file vector3.h
- *  @brief 3D vector structure, including operators when compiling in C++
- */
-#pragma once
-#ifndef AI_VECTOR3D_H_INC
-#define AI_VECTOR3D_H_INC
-
-#ifdef __GNUC__
-#   pragma GCC system_header
-#endif
-
-#ifdef __cplusplus
-#   include <cmath>
-#else
-#   include <math.h>
-#endif
-
-#include <assimp/defs.h>
-
-#ifdef __cplusplus
-
-template<typename TReal> class aiMatrix3x3t;
-template<typename TReal> class aiMatrix4x4t;
-
-// ---------------------------------------------------------------------------
-/** Represents a three-dimensional vector. */
-template <typename TReal>
-class aiVector3t {
-public:
-    aiVector3t() AI_NO_EXCEPT : x(), y(), z() {}
-    aiVector3t(TReal _x, TReal _y, TReal _z) : x(_x), y(_y), z(_z) {}
-    explicit aiVector3t (TReal _xyz ) : x(_xyz), y(_xyz), z(_xyz) {}
-    aiVector3t( const aiVector3t& o ) = default;
-
-    // combined operators
-    const aiVector3t& operator += (const aiVector3t& o);
-    const aiVector3t& operator -= (const aiVector3t& o);
-    const aiVector3t& operator *= (TReal f);
-    const aiVector3t& operator /= (TReal f);
-
-    // transform vector by matrix
-    aiVector3t& operator *= (const aiMatrix3x3t<TReal>& mat);
-    aiVector3t& operator *= (const aiMatrix4x4t<TReal>& mat);
-
-    // access a single element
-    TReal operator[](unsigned int i) const;
-    TReal& operator[](unsigned int i);
-
-    // comparison
-    bool operator== (const aiVector3t& other) const;
-    bool operator!= (const aiVector3t& other) const;
-    bool operator < (const aiVector3t& other) const;
-
-    bool Equal(const aiVector3t& other, TReal epsilon = 1e-6) const;
-
-    template <typename TOther>
-    operator aiVector3t<TOther> () const;
-
-    /** @brief Set the components of a vector
-     *  @param pX X component
-     *  @param pY Y component
-     *  @param pZ Z component  */
-    void Set( TReal pX, TReal pY, TReal pZ);
-
-    /** @brief Get the squared length of the vector
-     *  @return Square length */
-    TReal SquareLength() const;
-
-    /** @brief Get the length of the vector
-     *  @return length */
-    TReal Length() const;
-
-
-    /** @brief Normalize the vector */
-    aiVector3t& Normalize();
-
-    /** @brief Normalize the vector with extra check for zero vectors */
-    aiVector3t& NormalizeSafe();
-
-    /** @brief Componentwise multiplication of two vectors
-     *
-     *  Note that vec*vec yields the dot product.
-     *  @param o Second factor */
-    const aiVector3t SymMul(const aiVector3t& o);
-
-    TReal x, y, z;
-};
-
-
-typedef aiVector3t<ai_real> aiVector3D;
-
-#else
-
-struct aiVector3D {
-    ai_real x, y, z;
-};
-
-#endif // __cplusplus
-
-#ifdef __cplusplus
-
-#endif // __cplusplus
-
-#endif // AI_VECTOR3D_H_INC
diff --git a/thirdparty/assimp/include/assimp/vector3.inl b/thirdparty/assimp/include/assimp/vector3.inl
deleted file mode 100644
index 6682d3b32c..0000000000
--- a/thirdparty/assimp/include/assimp/vector3.inl
+++ /dev/null
@@ -1,309 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  vector3.inl
- *  @brief Inline implementation of aiVector3t<TReal> operators
- */
-#pragma once
-#ifndef AI_VECTOR3D_INL_INC
-#define AI_VECTOR3D_INL_INC
-
-#ifdef __cplusplus
-#include <assimp/vector3.h>
-
-#include <cmath>
-
-// ------------------------------------------------------------------------------------------------
-/** Transformation of a vector by a 3x3 matrix */
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * (const aiMatrix3x3t<TReal>& pMatrix, const aiVector3t<TReal>& pVector) {
-    aiVector3t<TReal> res;
-    res.x = pMatrix.a1 * pVector.x + pMatrix.a2 * pVector.y + pMatrix.a3 * pVector.z;
-    res.y = pMatrix.b1 * pVector.x + pMatrix.b2 * pVector.y + pMatrix.b3 * pVector.z;
-    res.z = pMatrix.c1 * pVector.x + pMatrix.c2 * pVector.y + pMatrix.c3 * pVector.z;
-    return res;
-}
-
-// ------------------------------------------------------------------------------------------------
-/** Transformation of a vector by a 4x4 matrix */
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * (const aiMatrix4x4t<TReal>& pMatrix, const aiVector3t<TReal>& pVector) {
-    aiVector3t<TReal> res;
-    res.x = pMatrix.a1 * pVector.x + pMatrix.a2 * pVector.y + pMatrix.a3 * pVector.z + pMatrix.a4;
-    res.y = pMatrix.b1 * pVector.x + pMatrix.b2 * pVector.y + pMatrix.b3 * pVector.z + pMatrix.b4;
-    res.z = pMatrix.c1 * pVector.x + pMatrix.c2 * pVector.y + pMatrix.c3 * pVector.z + pMatrix.c4;
-    return res;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-template <typename TOther>
-aiVector3t<TReal>::operator aiVector3t<TOther> () const {
-    return aiVector3t<TOther>(static_cast<TOther>(x),static_cast<TOther>(y),static_cast<TOther>(z));
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-void aiVector3t<TReal>::Set( TReal pX, TReal pY, TReal pZ) {
-    x = pX;
-    y = pY;
-    z = pZ;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal aiVector3t<TReal>::SquareLength() const {
-    return x*x + y*y + z*z;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal aiVector3t<TReal>::Length() const {
-    return std::sqrt( SquareLength());
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::Normalize() {
-    *this /= Length();
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::NormalizeSafe() {
-    TReal len = Length();
-    if ( len > static_cast< TReal >( 0 ) ) {
-        *this /= len;
-    }
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator += (const aiVector3t<TReal>& o) {
-    x += o.x;
-    y += o.y;
-    z += o.z;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator -= (const aiVector3t<TReal>& o) {
-    x -= o.x;
-    y -= o.y;
-    z -= o.z;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator *= (TReal f) {
-    x *= f;
-    y *= f;
-    z *= f;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal>& aiVector3t<TReal>::operator /= (TReal f) {
-    const TReal invF = (TReal) 1.0 / f;
-    x *= invF;
-    y *= invF;
-    z *= invF;
-
-    return *this;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::operator *= (const aiMatrix3x3t<TReal>& mat){
-    return (*this =  mat * (*this));
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal>& aiVector3t<TReal>::operator *= (const aiMatrix4x4t<TReal>& mat){
-    return (*this = mat * (*this));
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal aiVector3t<TReal>::operator[](unsigned int i) const {
-    switch (i) {
-        case 0:
-            return x;
-        case 1:
-            return y;
-        case 2:
-            return z;
-        default:
-            break;
-    }
-    return x;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-TReal& aiVector3t<TReal>::operator[](unsigned int i) {
-//    return *(&x + i);
-    switch (i) {
-        case 0:
-            return x;
-        case 1:
-            return y;
-        case 2:
-            return z;
-        default:
-            break;
-    }
-    return x;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::operator== (const aiVector3t<TReal>& other) const {
-    return x == other.x && y == other.y && z == other.z;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::operator!= (const aiVector3t<TReal>& other) const {
-    return x != other.x || y != other.y || z != other.z;
-}
-// ---------------------------------------------------------------------------
-template<typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::Equal(const aiVector3t<TReal>& other, TReal epsilon) const {
-    return
-        std::abs(x - other.x) <= epsilon &&
-        std::abs(y - other.y) <= epsilon &&
-        std::abs(z - other.z) <= epsilon;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-bool aiVector3t<TReal>::operator < (const aiVector3t<TReal>& other) const {
-    return x != other.x ? x < other.x : y != other.y ? y < other.y : z < other.z;
-}
-// ------------------------------------------------------------------------------------------------
-template <typename TReal>
-AI_FORCE_INLINE
-const aiVector3t<TReal> aiVector3t<TReal>::SymMul(const aiVector3t<TReal>& o) {
-    return aiVector3t<TReal>(x*o.x,y*o.y,z*o.z);
-}
-// ------------------------------------------------------------------------------------------------
-// symmetric addition
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator + (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
-    return aiVector3t<TReal>( v1.x + v2.x, v1.y + v2.y, v1.z + v2.z);
-}
-// ------------------------------------------------------------------------------------------------
-// symmetric subtraction
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator - (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
-    return aiVector3t<TReal>( v1.x - v2.x, v1.y - v2.y, v1.z - v2.z);
-}
-// ------------------------------------------------------------------------------------------------
-// scalar product
-template <typename TReal>
-AI_FORCE_INLINE
-TReal operator * (const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
-    return v1.x*v2.x + v1.y*v2.y + v1.z*v2.z;
-}
-// ------------------------------------------------------------------------------------------------
-// scalar multiplication
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * ( TReal f, const aiVector3t<TReal>& v) {
-    return aiVector3t<TReal>( f*v.x, f*v.y, f*v.z);
-}
-// ------------------------------------------------------------------------------------------------
-// and the other way around
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator * ( const aiVector3t<TReal>& v, TReal f) {
-    return aiVector3t<TReal>( f*v.x, f*v.y, f*v.z);
-}
-// ------------------------------------------------------------------------------------------------
-// scalar division
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator / ( const aiVector3t<TReal>& v, TReal f) {
-    return v * (1/f);
-}
-// ------------------------------------------------------------------------------------------------
-// vector division
-template <typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator / ( const aiVector3t<TReal>& v, const aiVector3t<TReal>& v2) {
-    return aiVector3t<TReal>(v.x / v2.x,v.y / v2.y,v.z / v2.z);
-}
-// ------------------------------------------------------------------------------------------------
-// cross product
-template<typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator ^ ( const aiVector3t<TReal>& v1, const aiVector3t<TReal>& v2) {
-    return aiVector3t<TReal>( v1.y*v2.z - v1.z*v2.y, v1.z*v2.x - v1.x*v2.z, v1.x*v2.y - v1.y*v2.x);
-}
-// ------------------------------------------------------------------------------------------------
-// vector negation
-template<typename TReal>
-AI_FORCE_INLINE
-aiVector3t<TReal> operator - ( const aiVector3t<TReal>& v) {
-    return aiVector3t<TReal>( -v.x, -v.y, -v.z);
-}
-
-// ------------------------------------------------------------------------------------------------
-
-#endif // __cplusplus
-#endif // AI_VECTOR3D_INL_INC
diff --git a/thirdparty/assimp/include/assimp/version.h b/thirdparty/assimp/include/assimp/version.h
deleted file mode 100644
index 2fdd37a43c..0000000000
--- a/thirdparty/assimp/include/assimp/version.h
+++ /dev/null
@@ -1,115 +0,0 @@
-/*
----------------------------------------------------------------------------
-Open Asset Import Library (assimp)
----------------------------------------------------------------------------
-
-Copyright (c) 2006-2019, assimp team
-
-
-
-All rights reserved.
-
-Redistribution and use of this software in source and binary forms,
-with or without modification, are permitted provided that the following
-conditions are met:
-
-* Redistributions of source code must retain the above
-  copyright notice, this list of conditions and the
-  following disclaimer.
-
-* Redistributions in binary form must reproduce the above
-  copyright notice, this list of conditions and the
-  following disclaimer in the documentation and/or other
-  materials provided with the distribution.
-
-* Neither the name of the assimp team, nor the names of its
-  contributors may be used to endorse or promote products
-  derived from this software without specific prior
-  written permission of the assimp team.
-
-THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
----------------------------------------------------------------------------
-*/
-
-/** @file  version.h
- *  @brief Functions to query the version of the Assimp runtime, check
- *    compile flags, ...
- */
-#pragma once
-#ifndef AI_VERSION_H_INC
-#define AI_VERSION_H_INC
-
-#include <assimp/defs.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-// ---------------------------------------------------------------------------
-/** @brief Returns a string with legal copyright and licensing information
- *  about Assimp. The string may include multiple lines.
- *  @return Pointer to static string.
- */
-ASSIMP_API const char*  aiGetLegalString  (void);
-
-// ---------------------------------------------------------------------------
-/** @brief Returns the current minor version number of Assimp.
- *  @return Minor version of the Assimp runtime the application was
- *    linked/built against
- */
-ASSIMP_API unsigned int aiGetVersionMinor (void);
-
-// ---------------------------------------------------------------------------
-/** @brief Returns the current major version number of Assimp.
- *  @return Major version of the Assimp runtime the application was
- *    linked/built against
- */
-ASSIMP_API unsigned int aiGetVersionMajor (void);
-
-// ---------------------------------------------------------------------------
-/** @brief Returns the repository revision of the Assimp runtime.
- *  @return SVN Repository revision number of the Assimp runtime the
- *          application was linked/built against.
- */
-ASSIMP_API unsigned int aiGetVersionRevision (void);
-
-// ---------------------------------------------------------------------------
-/** @brief Returns the branchname of the Assimp runtime.
- *  @return The current branch name.
- */
-ASSIMP_API const char *aiGetBranchName();
-
-//! Assimp was compiled as a shared object (Windows: DLL)
-#define ASSIMP_CFLAGS_SHARED  0x1
-//! Assimp was compiled against STLport
-#define ASSIMP_CFLAGS_STLPORT 0x2
-//! Assimp was compiled as a debug build
-#define ASSIMP_CFLAGS_DEBUG   0x4
-
-//! Assimp was compiled with ASSIMP_BUILD_BOOST_WORKAROUND defined
-#define ASSIMP_CFLAGS_NOBOOST           0x8
-//! Assimp was compiled with ASSIMP_BUILD_SINGLETHREADED defined
-#define ASSIMP_CFLAGS_SINGLETHREADED    0x10
-
-// ---------------------------------------------------------------------------
-/** @brief Returns assimp's compile flags
- *  @return Any bitwise combination of the ASSIMP_CFLAGS_xxx constants.
- */
-ASSIMP_API unsigned int aiGetCompileFlags (void);
-
-#ifdef __cplusplus
-} // end extern "C"
-#endif
-
-#endif // !! #ifndef AI_VERSION_H_INC
-