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diff --git a/src/mesh/assimp-master/include/assimp/SkeletonMeshBuilder.h b/src/mesh/assimp-master/include/assimp/SkeletonMeshBuilder.h
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+/** Helper class to construct a dummy mesh for file formats containing only motion data */
+
+/*
+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 SkeletonMeshBuilder.h
+ *  Declares SkeletonMeshBuilder, a tiny utility to build dummy meshes
+ *  for animation skeletons.
+ */
+
+#pragma once
+#ifndef AI_SKELETONMESHBUILDER_H_INC
+#define AI_SKELETONMESHBUILDER_H_INC
+
+#ifdef __GNUC__
+#pragma GCC system_header
+#endif
+
+#include <assimp/mesh.h>
+#include <vector>
+
+struct aiMaterial;
+struct aiScene;
+struct aiNode;
+
+namespace Assimp {
+
+// ---------------------------------------------------------------------------
+/**
+ * This little helper class constructs a dummy mesh for a given scene
+ * the resembles the node hierarchy. This is useful for file formats
+ * that don't carry any mesh data but only animation data.
+ */
+class ASSIMP_API SkeletonMeshBuilder {
+public:
+    // -------------------------------------------------------------------
+    /** The constructor processes the given scene and adds a mesh there.
+     *
+     * Does nothing if the scene already has mesh data.
+     * @param pScene The scene for which a skeleton mesh should be constructed.
+     * @param root The node to start with. nullptr is the scene root
+     * @param bKnobsOnly Set this to true if you don't want the connectors
+     *   between the knobs representing the nodes.
+     */
+    SkeletonMeshBuilder(aiScene *pScene, aiNode *root = nullptr,
+            bool bKnobsOnly = false);
+
+protected:
+    // -------------------------------------------------------------------
+    /** Recursively builds a simple mesh representation for the given node
+     * and also creates a joint for the node that affects this part of
+     * the mesh.
+     * @param pNode The node to build geometry for.
+     */
+    void CreateGeometry(const aiNode *pNode);
+
+    // -------------------------------------------------------------------
+    /** Creates the mesh from the internally accumulated stuff and returns it.
+     */
+    aiMesh *CreateMesh();
+
+    // -------------------------------------------------------------------
+    /** Creates a dummy material and returns it. */
+    aiMaterial *CreateMaterial();
+
+private:
+    /** space to assemble the mesh data: points */
+    std::vector<aiVector3D> mVertices;
+
+    /** faces */
+    struct Face {
+        unsigned int mIndices[3];
+        Face();
+        Face(unsigned int p0, unsigned int p1, unsigned int p2) {
+            mIndices[0] = p0;
+            mIndices[1] = p1;
+            mIndices[2] = p2;
+        }
+    };
+    std::vector<Face> mFaces;
+
+    /** bones */
+    std::vector<aiBone *> mBones;
+
+    bool mKnobsOnly;
+};
+
+} // end of namespace Assimp
+
+#endif // AI_SKELETONMESHBUILDER_H_INC