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diff --git a/libs/assimp/code/AssetLib/M3D/M3DExporter.h b/libs/assimp/code/AssetLib/M3D/M3DExporter.h
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+Copyright (c) 2019 bzt
+
+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 M3DExporter.h
+*   @brief Declares the exporter class to write a scene to a Model 3D file
+*/
+#ifndef AI_M3DEXPORTER_H_INC
+#define AI_M3DEXPORTER_H_INC
+
+#ifndef ASSIMP_BUILD_NO_M3D_IMPORTER
+#ifndef ASSIMP_BUILD_NO_M3D_EXPORTER
+
+#include <assimp/types.h>
+#include <assimp/StreamWriter.h> // StreamWriterLE
+#include <assimp/Exceptional.h> // DeadlyExportError
+
+#include <memory> // shared_ptr
+
+struct aiScene;
+struct aiNode;
+struct aiMaterial;
+struct aiFace;
+
+namespace Assimp {
+    class IOSystem;
+    class IOStream;
+    class ExportProperties;
+
+    class M3DWrapper;
+
+    // ---------------------------------------------------------------------
+    /** Helper class to export a given scene to an M3D file. */
+    // ---------------------------------------------------------------------
+    class M3DExporter {
+    public:
+        /// Constructor for a specific scene to export
+        M3DExporter(const aiScene* pScene, const ExportProperties* pProperties);
+        // call this to do the actual export
+        void doExport(const char* pFile, IOSystem* pIOSystem, bool toAscii);
+
+    private:
+        const aiScene* mScene; // the scene to export
+        const ExportProperties* mProperties; // currently unused
+        std::shared_ptr<IOStream> outfile; // file to write to
+
+        // helper to do the recursive walking
+        void NodeWalk(const M3DWrapper &m3d, const aiNode* pNode, aiMatrix4x4 m);
+    };
+}
+
+#endif // #ifndef ASSIMP_BUILD_NO_M3D_IMPORTER
+#endif // ASSIMP_BUILD_NO_M3D_EXPORTER
+
+#endif // AI_M3DEXPORTER_H_INC