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diff --git a/src/mesh/assimp-master/include/assimp/Subdivision.h b/src/mesh/assimp-master/include/assimp/Subdivision.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 a helper class to evaluate subdivision surfaces.*/
+#pragma once
+#ifndef AI_SUBDISIVION_H_INC
+#define AI_SUBDISIVION_H_INC
+
+#ifdef __GNUC__
+#   pragma GCC system_header
+#endif
+
+#include <assimp/types.h>
+
+struct aiMesh;
+
+namespace Assimp    {
+
+// ------------------------------------------------------------------------------
+/** Helper class to evaluate subdivision surfaces. Different algorithms
+ *  are provided for choice. */
+// ------------------------------------------------------------------------------
+class ASSIMP_API Subdivider {
+public:
+
+    /** Enumerates all supported subvidision algorithms */
+    enum Algorithm  {
+        CATMULL_CLARKE = 0x1
+    };
+
+    virtual ~Subdivider();
+
+    // ---------------------------------------------------------------
+    /** Create a subdivider of a specific type
+     *
+     *  @param algo Algorithm to be used for subdivision
+     *  @return Subdivider instance. */
+    static Subdivider* Create (Algorithm algo);
+
+    // ---------------------------------------------------------------
+    /** Subdivide a mesh using the selected algorithm
+     *
+     *  @param mesh First mesh to be subdivided. Must be in verbose
+     *    format.
+     *  @param out Receives the output mesh, allocated by me.
+     *  @param num Number of subdivisions to perform.
+     *  @param discard_input If true is passed, the input mesh is
+     *    deleted after the subdivision is complete. This can
+     *    improve performance because it allows the optimization
+     *    to reuse the existing mesh for intermediate results.
+     *  @pre out!=mesh*/
+    virtual void Subdivide ( aiMesh* mesh,
+        aiMesh*& out, unsigned int num,
+        bool discard_input = false) = 0;
+
+    // ---------------------------------------------------------------
+    /** Subdivide multiple meshes using the selected algorithm. This
+     *  avoids erroneous smoothing on objects consisting of multiple
+     *  per-material meshes. Usually, most 3d modellers smooth on a
+     *  per-object base, regardless the materials assigned to the
+     *  meshes.
+     *
+     *  @param smesh Array of meshes to be subdivided. Must be in
+     *    verbose format.
+     *  @param nmesh Number of meshes in smesh.
+     *  @param out Receives the output meshes. The array must be
+     *    sufficiently large (at least @c nmesh elements) and may not
+     *    overlap the input array. Output meshes map one-to-one to
+     *    their corresponding input meshes. The meshes are allocated
+     *    by the function.
+     *  @param discard_input If true is passed, input meshes are
+     *    deleted after the subdivision is complete. This can
+     *    improve performance because it allows the optimization
+     *    of reusing existing meshes for intermediate results.
+     *  @param num Number of subdivisions to perform.
+     *  @pre nmesh != 0, smesh and out may not overlap*/
+    virtual void Subdivide (
+        aiMesh** smesh,
+        size_t nmesh,
+        aiMesh** out,
+        unsigned int num,
+        bool discard_input = false) = 0;
+
+};
+
+inline
+Subdivider::~Subdivider() {
+    // empty
+}
+
+} // end namespace Assimp
+
+
+#endif // !!  AI_SUBDISIVION_H_INC
+