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diff --git a/thirdparty/assimp/code/ValidateDataStructure.h b/thirdparty/assimp/code/ValidateDataStructure.h
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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 Defines a (dummy) post processing step to validate the loader's
+ * output data structure (for debugging)
+ */
+#ifndef AI_VALIDATEPROCESS_H_INC
+#define AI_VALIDATEPROCESS_H_INC
+
+#include <assimp/types.h>
+#include <assimp/material.h>
+#include "BaseProcess.h"
+
+struct aiBone;
+struct aiMesh;
+struct aiAnimation;
+struct aiNodeAnim;
+struct aiTexture;
+struct aiMaterial;
+struct aiNode;
+struct aiString;
+struct aiCamera;
+struct aiLight;
+
+namespace Assimp    {
+
+// --------------------------------------------------------------------------------------
+/** Validates the whole ASSIMP scene data structure for correctness.
+ *  ImportErrorException is thrown of the scene is corrupt.*/
+// --------------------------------------------------------------------------------------
+class ValidateDSProcess : public BaseProcess
+{
+public:
+
+    ValidateDSProcess();
+    ~ValidateDSProcess();
+
+public:
+    // -------------------------------------------------------------------
+    bool IsActive( unsigned int pFlags) const;
+
+    // -------------------------------------------------------------------
+    void Execute( aiScene* pScene);
+
+protected:
+
+    // -------------------------------------------------------------------
+    /** Report a validation error. This will throw an exception,
+     *  control won't return.
+     * @param msg Format string for sprintf().*/
+    AI_WONT_RETURN void ReportError(const char* msg,...) AI_WONT_RETURN_SUFFIX;
+
+
+    // -------------------------------------------------------------------
+    /** Report a validation warning. This won't throw an exception,
+     *  control will return to the caller.
+     * @param msg Format string for sprintf().*/
+    void ReportWarning(const char* msg,...);
+
+
+    // -------------------------------------------------------------------
+    /** Validates a mesh
+     * @param pMesh Input mesh*/
+    void Validate( const aiMesh* pMesh);
+
+    // -------------------------------------------------------------------
+    /** Validates a bone
+     * @param pMesh Input mesh
+     * @param pBone Input bone*/
+    void Validate( const aiMesh* pMesh,const aiBone* pBone,float* afSum);
+
+    // -------------------------------------------------------------------
+    /** Validates an animation
+     * @param pAnimation Input animation*/
+    void Validate( const aiAnimation* pAnimation);
+
+    // -------------------------------------------------------------------
+    /** Validates a material
+     * @param pMaterial Input material*/
+    void Validate( const aiMaterial* pMaterial);
+
+    // -------------------------------------------------------------------
+    /** Search the material data structure for invalid or corrupt
+     *  texture keys.
+     * @param pMaterial Input material
+     * @param type Type of the texture*/
+    void SearchForInvalidTextures(const aiMaterial* pMaterial,
+        aiTextureType type);
+
+    // -------------------------------------------------------------------
+    /** Validates a texture
+     * @param pTexture Input texture*/
+    void Validate( const aiTexture* pTexture);
+
+    // -------------------------------------------------------------------
+    /** Validates a light source
+     * @param pLight Input light
+     */
+    void Validate( const aiLight* pLight);
+
+    // -------------------------------------------------------------------
+    /** Validates a camera
+     * @param pCamera Input camera*/
+    void Validate( const aiCamera* pCamera);
+
+    // -------------------------------------------------------------------
+    /** Validates a bone animation channel
+     * @param pAnimation Animation channel.
+     * @param pBoneAnim Input bone animation */
+    void Validate( const aiAnimation* pAnimation,
+        const aiNodeAnim* pBoneAnim);
+
+    // -------------------------------------------------------------------
+    /** Validates a node and all of its subnodes
+     * @param Node Input node*/
+    void Validate( const aiNode* pNode);
+
+    // -------------------------------------------------------------------
+    /** Validates a string
+     * @param pString Input string*/
+    void Validate( const aiString* pString);
+
+private:
+
+    // template to validate one of the aiScene::mXXX arrays
+    template <typename T>
+    inline void DoValidation(T** array, unsigned int size,
+        const char* firstName, const char* secondName);
+
+    // extended version: checks whether T::mName occurs twice
+    template <typename T>
+    inline void DoValidationEx(T** array, unsigned int size,
+        const char* firstName, const char* secondName);
+
+    // extension to the first template which does also search
+    // the nodegraph for an item with the same name
+    template <typename T>
+    inline void DoValidationWithNameCheck(T** array, unsigned int size,
+        const char* firstName, const char* secondName);
+
+    aiScene* mScene;
+};
+
+
+
+
+} // end of namespace Assimp
+
+#endif // AI_VALIDATEPROCESS_H_INC