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diff --git a/thirdparty/assimp/code/FBXMaterial.cpp b/thirdparty/assimp/code/FBXMaterial.cpp
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+++ b/thirdparty/assimp/code/FBXMaterial.cpp
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+/*
+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  FBXMaterial.cpp
+ *  @brief Assimp::FBX::Material and Assimp::FBX::Texture implementation
+ */
+
+#ifndef ASSIMP_BUILD_NO_FBX_IMPORTER
+
+#include "FBXParser.h"
+#include "FBXDocument.h"
+#include "FBXImporter.h"
+#include "FBXImportSettings.h"
+#include "FBXDocumentUtil.h"
+#include "FBXProperties.h"
+#include <assimp/ByteSwapper.h>
+
+#include <algorithm> // std::transform
+
+namespace Assimp {
+namespace FBX {
+
+    using namespace Util;
+
+// ------------------------------------------------------------------------------------------------
+Material::Material(uint64_t id, const Element& element, const Document& doc, const std::string& name)
+: Object(id,element,name)
+{
+    const Scope& sc = GetRequiredScope(element);
+
+    const Element* const ShadingModel = sc["ShadingModel"];
+    const Element* const MultiLayer = sc["MultiLayer"];
+
+    if(MultiLayer) {
+        multilayer = !!ParseTokenAsInt(GetRequiredToken(*MultiLayer,0));
+    }
+
+    if(ShadingModel) {
+        shading = ParseTokenAsString(GetRequiredToken(*ShadingModel,0));
+    }
+    else {
+        DOMWarning("shading mode not specified, assuming phong",&element);
+        shading = "phong";
+    }
+
+    std::string templateName;
+
+    // lower-case shading because Blender (for example) writes "Phong"
+    std::transform(shading.begin(), shading.end(), shading.begin(), ::tolower);
+    if(shading == "phong") {
+        templateName = "Material.FbxSurfacePhong";
+    }
+    else if(shading == "lambert") {
+        templateName = "Material.FbxSurfaceLambert";
+    }
+    else {
+        DOMWarning("shading mode not recognized: " + shading,&element);
+    }
+
+    props = GetPropertyTable(doc,templateName,element,sc);
+
+    // resolve texture links
+    const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced(ID());
+    for(const Connection* con : conns) {
+
+        // texture link to properties, not objects
+        if (!con->PropertyName().length()) {
+            continue;
+        }
+
+        const Object* const ob = con->SourceObject();
+        if(!ob) {
+            DOMWarning("failed to read source object for texture link, ignoring",&element);
+            continue;
+        }
+
+        const Texture* const tex = dynamic_cast<const Texture*>(ob);
+        if(!tex) {
+            const LayeredTexture* const layeredTexture = dynamic_cast<const LayeredTexture*>(ob);
+            if(!layeredTexture) {
+                DOMWarning("source object for texture link is not a texture or layered texture, ignoring",&element);
+                continue;
+            }
+            const std::string& prop = con->PropertyName();
+            if (layeredTextures.find(prop) != layeredTextures.end()) {
+                DOMWarning("duplicate layered texture link: " + prop,&element);
+            }
+
+            layeredTextures[prop] = layeredTexture;
+            ((LayeredTexture*)layeredTexture)->fillTexture(doc);
+        }
+        else
+        {
+            const std::string& prop = con->PropertyName();
+            if (textures.find(prop) != textures.end()) {
+                DOMWarning("duplicate texture link: " + prop,&element);
+            }
+
+            textures[prop] = tex;
+        }
+
+    }
+}
+
+
+// ------------------------------------------------------------------------------------------------
+Material::~Material()
+{
+}
+
+
+// ------------------------------------------------------------------------------------------------
+Texture::Texture(uint64_t id, const Element& element, const Document& doc, const std::string& name)
+: Object(id,element,name)
+, uvScaling(1.0f,1.0f)
+, media(0)
+{
+    const Scope& sc = GetRequiredScope(element);
+
+    const Element* const Type = sc["Type"];
+    const Element* const FileName = sc["FileName"];
+    const Element* const RelativeFilename = sc["RelativeFilename"];
+    const Element* const ModelUVTranslation = sc["ModelUVTranslation"];
+    const Element* const ModelUVScaling = sc["ModelUVScaling"];
+    const Element* const Texture_Alpha_Source = sc["Texture_Alpha_Source"];
+    const Element* const Cropping = sc["Cropping"];
+
+    if(Type) {
+        type = ParseTokenAsString(GetRequiredToken(*Type,0));
+    }
+
+    if(FileName) {
+        fileName = ParseTokenAsString(GetRequiredToken(*FileName,0));
+    }
+
+    if(RelativeFilename) {
+        relativeFileName = ParseTokenAsString(GetRequiredToken(*RelativeFilename,0));
+    }
+
+    if(ModelUVTranslation) {
+        uvTrans = aiVector2D(ParseTokenAsFloat(GetRequiredToken(*ModelUVTranslation,0)),
+            ParseTokenAsFloat(GetRequiredToken(*ModelUVTranslation,1))
+        );
+    }
+
+    if(ModelUVScaling) {
+        uvScaling = aiVector2D(ParseTokenAsFloat(GetRequiredToken(*ModelUVScaling,0)),
+            ParseTokenAsFloat(GetRequiredToken(*ModelUVScaling,1))
+        );
+    }
+
+    if(Cropping) {
+        crop[0] = ParseTokenAsInt(GetRequiredToken(*Cropping,0));
+        crop[1] = ParseTokenAsInt(GetRequiredToken(*Cropping,1));
+        crop[2] = ParseTokenAsInt(GetRequiredToken(*Cropping,2));
+        crop[3] = ParseTokenAsInt(GetRequiredToken(*Cropping,3));
+    }
+    else {
+        // vc8 doesn't support the crop() syntax in initialization lists
+        // (and vc9 WARNS about the new (i.e. compliant) behaviour).
+        crop[0] = crop[1] = crop[2] = crop[3] = 0;
+    }
+
+    if(Texture_Alpha_Source) {
+        alphaSource = ParseTokenAsString(GetRequiredToken(*Texture_Alpha_Source,0));
+    }
+
+    props = GetPropertyTable(doc,"Texture.FbxFileTexture",element,sc);
+
+    // resolve video links
+    if(doc.Settings().readTextures) {
+        const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced(ID());
+        for(const Connection* con : conns) {
+            const Object* const ob = con->SourceObject();
+            if(!ob) {
+                DOMWarning("failed to read source object for texture link, ignoring",&element);
+                continue;
+            }
+
+            const Video* const video = dynamic_cast<const Video*>(ob);
+            if(video) {
+                media = video;
+            }
+        }
+    }
+}
+
+
+Texture::~Texture()
+{
+
+}
+
+LayeredTexture::LayeredTexture(uint64_t id, const Element& element, const Document& /*doc*/, const std::string& name)
+: Object(id,element,name)
+,blendMode(BlendMode_Modulate)
+,alpha(1)
+{
+    const Scope& sc = GetRequiredScope(element);
+
+    const Element* const BlendModes = sc["BlendModes"];
+    const Element* const Alphas = sc["Alphas"];
+
+
+    if(BlendModes!=0)
+    {
+        blendMode = (BlendMode)ParseTokenAsInt(GetRequiredToken(*BlendModes,0));
+    }
+    if(Alphas!=0)
+    {
+        alpha = ParseTokenAsFloat(GetRequiredToken(*Alphas,0));
+    }
+}
+
+LayeredTexture::~LayeredTexture()
+{
+    
+}
+
+void LayeredTexture::fillTexture(const Document& doc)
+{
+    const std::vector<const Connection*>& conns = doc.GetConnectionsByDestinationSequenced(ID());
+    for(size_t i = 0; i < conns.size();++i)
+    {
+        const Connection* con = conns.at(i);
+
+        const Object* const ob = con->SourceObject();
+        if(!ob) {
+            DOMWarning("failed to read source object for texture link, ignoring",&element);
+            continue;
+        }
+
+        const Texture* const tex = dynamic_cast<const Texture*>(ob);
+
+        textures.push_back(tex);
+    }
+}
+
+
+// ------------------------------------------------------------------------------------------------
+Video::Video(uint64_t id, const Element& element, const Document& doc, const std::string& name)
+: Object(id,element,name)
+, contentLength(0)
+, content(0)
+{
+    const Scope& sc = GetRequiredScope(element);
+
+    const Element* const Type = sc["Type"];
+    const Element* const FileName = sc.FindElementCaseInsensitive("FileName");  //some files retain the information as "Filename", others "FileName", who knows
+    const Element* const RelativeFilename = sc["RelativeFilename"];
+    const Element* const Content = sc["Content"];
+
+    if(Type) {
+        type = ParseTokenAsString(GetRequiredToken(*Type,0));
+    }
+
+    if(FileName) {
+        fileName = ParseTokenAsString(GetRequiredToken(*FileName,0));
+    }
+
+    if(RelativeFilename) {
+        relativeFileName = ParseTokenAsString(GetRequiredToken(*RelativeFilename,0));
+    }
+
+    if(Content) {
+        //this field is omitted when the embedded texture is already loaded, let's ignore if it's not found
+        try {
+            const Token& token = GetRequiredToken(*Content, 0);
+            const char* data = token.begin();
+            if (!token.IsBinary()) {
+                DOMWarning("video content is not binary data, ignoring", &element);
+            }
+            else if (static_cast<size_t>(token.end() - data) < 5) {
+                DOMError("binary data array is too short, need five (5) bytes for type signature and element count", &element);
+            }
+            else if (*data != 'R') {
+                DOMWarning("video content is not raw binary data, ignoring", &element);
+            }
+            else {
+                // read number of elements
+                uint32_t len = 0;
+                ::memcpy(&len, data + 1, sizeof(len));
+                AI_SWAP4(len);
+
+                contentLength = len;
+
+                content = new uint8_t[len];
+                ::memcpy(content, data + 5, len);
+            }
+        } catch (const runtime_error& runtimeError)
+        {
+            //we don't need the content data for contents that has already been loaded
+            ASSIMP_LOG_DEBUG_F("Caught exception in FBXMaterial (likely because content was already loaded): ",
+                    runtimeError.what());
+        }
+    }
+
+    props = GetPropertyTable(doc,"Video.FbxVideo",element,sc);
+}
+
+
+Video::~Video()
+{
+    if(content) {
+        delete[] content;
+    }
+}
+
+} //!FBX
+} //!Assimp
+
+#endif