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diff --git a/src/mesh/assimp-master/code/AssetLib/X/XFileExporter.h b/src/mesh/assimp-master/code/AssetLib/X/XFileExporter.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.
+
+@author: Richard Steffen, 2014
+
+----------------------------------------------------------------------
+*/
+
+/** @file XFileExporter.h
+ * Declares the exporter class to write a scene to a Collada file
+ */
+#ifndef AI_XFILEEXPORTER_H_INC
+#define AI_XFILEEXPORTER_H_INC
+
+#include <assimp/ai_assert.h>
+#include <assimp/matrix4x4.h>
+#include <assimp/Exporter.hpp>
+#include <sstream>
+
+struct aiScene;
+struct aiNode;
+struct aiMesh;
+struct aiString;
+
+namespace Assimp {
+
+class IOSystem;
+
+
+/// Helper class to export a given scene to a X-file.
+/// Note: an xFile uses a left hand system. Assimp used a right hand system (OpenGL), therefore we have to transform everything
+class XFileExporter
+{
+public:
+    /// Constructor for a specific scene to export
+    XFileExporter(const aiScene* pScene, IOSystem* pIOSystem, const std::string& path, const std::string& file, const ExportProperties* pProperties);
+
+    /// Destructor
+    virtual ~XFileExporter();
+
+protected:
+    /// Starts writing the contents
+    void WriteFile();
+
+    /// Writes the asset header
+    void WriteHeader();
+
+    /// write a frame transform
+    void WriteFrameTransform(aiMatrix4x4& m);
+
+    /// Recursively writes the given node
+    void WriteNode( aiNode* pNode );
+
+    /// write a mesh entry of the scene
+    void WriteMesh( aiMesh* mesh);
+
+    /// Enters a new xml element, which increases the indentation
+    void PushTag() { startstr.append( "  "); }
+
+    /// Leaves an element, decreasing the indentation
+    void PopTag() {
+        ai_assert( startstr.length() > 1);
+        startstr.erase( startstr.length() - 2);
+    }
+
+public:
+    /// Stringstream to write all output into
+    std::stringstream mOutput;
+
+protected:
+
+    /// normalize the name to be accepted by xfile readers
+    std::string toXFileString(aiString &name);
+
+    /// hold the properties pointer
+    const ExportProperties* mProperties;
+
+    /// write a path
+    void writePath(const aiString &path);
+
+    /// 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;
+
+    /// The scene to be written
+    const aiScene* mScene;
+    bool mSceneOwned;
+
+    /// current line start string, contains the current indentation for simple stream insertion
+    std::string startstr;
+
+    /// current line end string for simple stream insertion
+    std::string endstr;
+
+};
+
+}
+
+#endif // !! AI_XFILEEXPORTER_H_INC