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diff --git a/src/mesh/assimp-master/code/AssetLib/DXF/DXFLoader.h b/src/mesh/assimp-master/code/AssetLib/DXF/DXFLoader.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  DXFLoader.h
+ *  @brief Declaration of the .dxf importer class.
+ */
+#pragma once
+#ifndef AI_DXFLOADER_H_INCLUDED
+#define AI_DXFLOADER_H_INCLUDED
+
+#include <assimp/BaseImporter.h>
+#include <map>
+
+namespace Assimp    {
+
+// Forward declarations
+namespace DXF {
+    class LineReader;
+    struct FileData;
+    struct PolyLine;
+    struct Block;
+    struct InsertBlock;
+
+    using BlockMap = std::map<std::string, const DXF::Block*>;
+}
+
+// ---------------------------------------------------------------------------
+/**
+ *  @brief  DXF importer implementation.
+ */
+class DXFImporter : public BaseImporter {
+public:
+    DXFImporter();
+    ~DXFImporter() override;
+
+    // -------------------------------------------------------------------
+    /** Returns whether the class can handle the format of the given file.
+    * See BaseImporter::CanRead() for details.  */
+    bool CanRead( const std::string& pFile, IOSystem* pIOHandler,
+        bool checkSig) const override;
+
+protected:
+    // -------------------------------------------------------------------
+    /** Return importer meta information.
+     * See #BaseImporter::GetInfo for the details*/
+    const aiImporterDesc* GetInfo () const override;
+
+    // -------------------------------------------------------------------
+    /** Imports the given file into the given scene structure.
+     * See BaseImporter::InternReadFile() for details */
+    void InternReadFile( const std::string& pFile, aiScene* pScene, IOSystem* pIOHandler) override;
+
+private:
+    // -----------------------------------------------------
+    void SkipSection(DXF::LineReader& reader);
+
+    // -----------------------------------------------------
+    void ParseHeader(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseEntities(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseBlocks(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseBlock(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParseInsertion(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParsePolyLine(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ParsePolyLineVertex(DXF::LineReader& reader,
+        DXF::PolyLine& line);
+
+    // -----------------------------------------------------
+    void Parse3DFace(DXF::LineReader& reader,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ConvertMeshes(aiScene* pScene,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void GenerateHierarchy(aiScene* pScene,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void GenerateMaterials(aiScene* pScene,
+        DXF::FileData& output);
+
+    // -----------------------------------------------------
+    void ExpandBlockReferences(DXF::Block& bl,
+        const DXF::BlockMap& blocks_by_name);
+};
+
+} // end of namespace Assimp
+
+#endif // AI_3DSIMPORTER_H_INC