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diff --git a/src/mesh/assimp-master/code/Pbrt/PbrtExporter.h b/src/mesh/assimp-master/code/Pbrt/PbrtExporter.h
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, 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 PbrtExporter.h
+* Declares the exporter class to write a scene to a pbrt file
+*/
+#ifndef AI_PBRTEXPORTER_H_INC
+#define AI_PBRTEXPORTER_H_INC
+
+#ifndef ASSIMP_BUILD_NO_PBRT_EXPORTER
+
+#include <assimp/types.h>
+#include <assimp/StreamWriter.h>
+#include <assimp/Exceptional.h>
+
+#include <map>
+#include <set>
+#include <string>
+#include <sstream>
+
+struct aiScene;
+struct aiNode;
+struct aiMaterial;
+struct aiMesh;
+
+namespace Assimp {
+
+class IOSystem;
+class IOStream;
+class ExportProperties;
+
+// ---------------------------------------------------------------------
+/** Helper class to export a given scene to a Pbrt file. */
+// ---------------------------------------------------------------------
+class PbrtExporter
+{
+public:
+    /// Constructor for a specific scene to export
+    PbrtExporter(const aiScene *pScene, IOSystem *pIOSystem,
+            const std::string &path, const std::string &file);
+
+    /// Destructor
+    virtual ~PbrtExporter();
+
+private:
+    // the scene to export
+    const aiScene* mScene;
+
+    /// Stringstream to write all output into
+    std::stringstream mOutput;
+
+    /// The IOSystem for output
+    IOSystem* mIOSystem;
+
+    /// Path of the directory where the scene will be exported
+    const std::string mPath;
+
+    /// Name of the file (without extension) where the scene will be exported
+    const std::string mFile;
+
+private:
+    //  A private set to keep track of which textures have been declared
+    std::set<std::string> mTextureSet;
+
+    aiMatrix4x4 GetNodeTransform(const aiString& name) const;
+    static std::string TransformAsString(const aiMatrix4x4& m);
+
+    static std::string RemoveSuffix(std::string filename);
+    std::string CleanTextureFilename(const aiString &f, bool rewriteExtension = true) const;
+
+    void WriteMetaData();
+
+    void WriteWorldDefinition();
+
+    void WriteCameras();
+    void WriteCamera(int i);
+
+    void WriteLights();
+
+    void WriteTextures();
+    static bool TextureHasAlphaMask(const std::string &filename);
+
+    void WriteMaterials();
+    void WriteMaterial(int i);
+
+    void WriteMesh(aiMesh* mesh);
+
+    void WriteInstanceDefinition(int i);
+    void WriteGeometricObjects(aiNode* node, aiMatrix4x4 parentTransform,
+                               std::map<int, int> &meshUses);
+};
+
+} // namespace Assimp
+
+#endif // ASSIMP_BUILD_NO_PBRT_EXPORTER
+
+#endif // AI_PBRTEXPORTER_H_INC