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diff --git a/libs/assimp/tools/assimp_view/MeshRenderer.h b/libs/assimp/tools/assimp_view/MeshRenderer.h
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, 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.
+---------------------------------------------------------------------------
+*/
+
+#if (!defined AV_MESH_RENDERER_H_INCLUDED)
+#define AV_MESH_RENDERER_H_INCLUDED
+
+namespace AssimpView {
+
+
+    //-------------------------------------------------------------------------------
+    /* Helper class tp render meshes
+    */
+    //-------------------------------------------------------------------------------
+    class CMeshRenderer
+    {
+    private:
+
+        // default constructor
+        CMeshRenderer()
+
+        {
+            // no other members to initialize
+        }
+
+    public:
+
+        //------------------------------------------------------------------
+        // Singleton accessors
+        static CMeshRenderer s_cInstance;
+        inline static CMeshRenderer& Instance()
+        {
+            return s_cInstance;
+        }
+
+
+        //------------------------------------------------------------------
+        // Draw a mesh in the global mesh list using the current pipeline state
+        // iIndex Index of the mesh to be drawn
+        //
+        // The function draws all faces in order, regardless of their distance
+        int DrawUnsorted( unsigned int iIndex );
+
+        //------------------------------------------------------------------
+        // Draw a mesh in the global mesh list using the current pipeline state
+        // iIndex Index of the mesh to be drawn
+        //
+        // The method sorts all vertices by their distance (back to front)
+        //
+        // mWorld World matrix for the node
+        int DrawSorted( unsigned int iIndex,
+            const aiMatrix4x4& mWorld );
+
+
+
+    private:
+
+
+    };
+
+}
+#endif //!! include guard