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diff --git a/src/mesh/assimp-master/code/AssetLib/STL/STLLoader.h b/src/mesh/assimp-master/code/AssetLib/STL/STLLoader.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 STLLoader.h
+ *  Declaration of the STL importer class.
+ */
+#ifndef AI_STLLOADER_H_INCLUDED
+#define AI_STLLOADER_H_INCLUDED
+
+#include <assimp/BaseImporter.h>
+#include <assimp/types.h>
+
+// Forward declarations
+struct aiNode;
+
+namespace Assimp {
+
+// ---------------------------------------------------------------------------
+/**
+ * @brief   Importer class for the sterolithography STL file format.
+ */
+class STLImporter : public BaseImporter {
+public:
+    /**
+     * @brief STLImporter, the class default constructor.
+     */
+    STLImporter();
+
+    /**
+     * @brief   The class destructor.
+     */
+    ~STLImporter() override;
+
+    /**
+     * @brief   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:
+
+    /**
+     * @brief   Return importer meta information.
+     *  See #BaseImporter::GetInfo for the details
+     */
+    const aiImporterDesc* GetInfo () const override;
+
+    /**
+     * @brief   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;
+
+    /**
+     * @brief   Loads a binary .stl file
+     * @return true if the default vertex color must be used as material color
+     */
+    bool LoadBinaryFile();
+
+    /**
+     * @brief   Loads a ASCII text .stl file
+     */
+    void LoadASCIIFile( aiNode *root );
+
+    void pushMeshesToNode( std::vector<unsigned int> &meshIndices, aiNode *node );
+
+protected:
+
+    /** Buffer to hold the loaded file */
+    const char* mBuffer;
+
+    /** Size of the file, in bytes */
+    unsigned int mFileSize;
+
+    /** Output scene */
+    aiScene* mScene;
+
+    /** Default vertex color */
+    aiColor4D mClrColorDefault;
+};
+
+} // end of namespace Assimp
+
+#endif // AI_3DSIMPORTER_H_IN