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diff --git a/src/mesh/assimp-master/include/assimp/SmoothingGroups.h b/src/mesh/assimp-master/include/assimp/SmoothingGroups.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 Defines the helper data structures for importing 3DS files.
+http://www.jalix.org/ressources/graphics/3DS/_unofficials/3ds-unofficial.txt */
+
+#pragma once
+#ifndef AI_SMOOTHINGGROUPS_H_INC
+#define AI_SMOOTHINGGROUPS_H_INC
+
+#ifdef __GNUC__
+#   pragma GCC system_header
+#endif
+
+#include <assimp/vector3.h>
+
+#include <stdint.h>
+#include <vector>
+
+// ---------------------------------------------------------------------------
+/** Helper structure representing a face with smoothing groups assigned */
+struct FaceWithSmoothingGroup {
+    FaceWithSmoothingGroup() AI_NO_EXCEPT
+    : mIndices()
+    , iSmoothGroup(0) {
+        // in debug builds set all indices to a common magic value
+#ifdef ASSIMP_BUILD_DEBUG
+        this->mIndices[0] = 0xffffffff;
+        this->mIndices[1] = 0xffffffff;
+        this->mIndices[2] = 0xffffffff;
+#endif
+    }
+
+
+    //! Indices. .3ds is using uint16. However, after
+    //! an unique vertex set has been generated,
+    //! individual index values might exceed 2^16
+    uint32_t mIndices[3];
+
+    //! specifies to which smoothing group the face belongs to
+    uint32_t iSmoothGroup;
+};
+
+// ---------------------------------------------------------------------------
+/** Helper structure representing a mesh whose faces have smoothing
+    groups assigned. This allows us to reuse the code for normal computations
+    from smoothings groups for several loaders (3DS, ASE). All of them
+    use face structures which inherit from #FaceWithSmoothingGroup,
+    but as they add extra members and need to be copied by value we
+    need to use a template here.
+    */
+template <class T>
+struct MeshWithSmoothingGroups
+{
+    //! Vertex positions
+    std::vector<aiVector3D> mPositions;
+
+    //! Face lists
+    std::vector<T> mFaces;
+
+    //! List of normal vectors
+    std::vector<aiVector3D> mNormals;
+};
+
+// ---------------------------------------------------------------------------
+/** Computes normal vectors for the mesh
+ */
+template <class T>
+void ComputeNormalsWithSmoothingsGroups(MeshWithSmoothingGroups<T>& sMesh);
+
+
+// include implementations
+#include "SmoothingGroups.inl"
+
+#endif // !! AI_SMOOTHINGGROUPS_H_INC