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diff --git a/libs/assimp/code/AssetLib/Obj/ObjFileMtlImporter.h b/libs/assimp/code/AssetLib/Obj/ObjFileMtlImporter.h
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+++ b/libs/assimp/code/AssetLib/Obj/ObjFileMtlImporter.h
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2020, 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.
+
+----------------------------------------------------------------------*/
+#ifndef OBJFILEMTLIMPORTER_H_INC
+#define OBJFILEMTLIMPORTER_H_INC
+
+#include <assimp/defs.h>
+#include <string>
+#include <vector>
+
+struct aiColor3D;
+struct aiString;
+
+namespace Assimp {
+
+namespace ObjFile {
+struct Model;
+struct Material;
+} // namespace ObjFile
+
+/**
+ *  @class  ObjFileMtlImporter
+ *  @brief  Loads the material description from a mtl file.
+ */
+class ObjFileMtlImporter {
+public:
+    static const size_t BUFFERSIZE = 2048;
+    using DataArray = std::vector<char>;
+    using DataArrayIt = std::vector<char>::iterator;
+    using ConstDataArrayIt = std::vector<char>::const_iterator;
+
+    //! \brief  The class default constructor
+    ObjFileMtlImporter(std::vector<char> &buffer, const std::string &strAbsPath,
+            ObjFile::Model *pModel);
+
+    //! \brief  The class destructor
+    ~ObjFileMtlImporter();
+
+    ObjFileMtlImporter(const ObjFileMtlImporter &rOther) = delete;
+    ObjFileMtlImporter &operator=(const ObjFileMtlImporter &rOther) = delete;
+
+private:
+    /// Copy constructor, empty.
+    /// Load the whole material description
+    void load();
+    /// Get color data.
+    void getColorRGBA(aiColor3D *pColor);
+    /// Get illumination model from loaded data
+    void getIlluminationModel(int &illum_model);
+    /// Gets a float value from data.
+    void getFloatValue(ai_real &value);
+    /// Creates a new material from loaded data.
+    void createMaterial();
+    /// Get texture name from loaded data.
+    void getTexture();
+    void getTextureOption(bool &clamp, int &clampIndex, aiString *&out);
+
+private:
+    //! Absolute pathname
+    std::string m_strAbsPath;
+    //! Data iterator showing to the current position in data buffer
+    DataArrayIt m_DataIt;
+    //! Data iterator to end of buffer
+    DataArrayIt m_DataItEnd;
+    //! USed model instance
+    ObjFile::Model *m_pModel;
+    //! Current line in file
+    unsigned int m_uiLine;
+    //! Helper buffer
+    std::vector<char> m_buffer;
+};
+
+// ------------------------------------------------------------------------------------------------
+
+} // Namespace Assimp
+
+#endif // OBJFILEMTLIMPORTER_H_INC