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diff --git a/libs/assimp/code/AssetLib/Blender/BlenderBMesh.h b/libs/assimp/code/AssetLib/Blender/BlenderBMesh.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  BlenderBMesh.h
+ *  @brief Conversion of Blender's new BMesh stuff
+ */
+#ifndef INCLUDED_AI_BLEND_BMESH_H
+#define INCLUDED_AI_BLEND_BMESH_H
+
+#include <assimp/LogAux.h>
+
+namespace Assimp
+{
+    // TinyFormatter.h
+    namespace Formatter
+    {
+        template < typename T,typename TR, typename A > class basic_formatter;
+        typedef class basic_formatter< char, std::char_traits< char >, std::allocator< char > > format;
+    }
+
+    // BlenderScene.h
+    namespace Blender
+    {
+        struct Mesh;
+        struct MPoly;
+        struct MLoop;
+    }
+
+    class BlenderBMeshConverter: public LogFunctions< BlenderBMeshConverter >
+    {
+    public:
+        BlenderBMeshConverter( const Blender::Mesh* mesh );
+        ~BlenderBMeshConverter( );
+
+        bool ContainsBMesh( ) const;
+
+        const Blender::Mesh* TriangulateBMesh( );
+
+    private:
+        void AssertValidMesh( );
+        void AssertValidSizes( );
+        void PrepareTriMesh( );
+        void DestroyTriMesh( );
+        void ConvertPolyToFaces( const Blender::MPoly& poly );
+        void AddFace( int v1, int v2, int v3, int v4 = 0 );
+        void AddTFace( const float* uv1, const float* uv2, const float *uv3, const float* uv4 = 0 );
+
+        const Blender::Mesh* BMesh;
+        Blender::Mesh* triMesh;
+
+        friend class BlenderTessellatorGL;
+        friend class BlenderTessellatorP2T;
+    };
+
+} // end of namespace Assimp
+
+#endif // INCLUDED_AI_BLEND_BMESH_H