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diff --git a/src/mesh/assimp-master/include/assimp/vector2.h b/src/mesh/assimp-master/include/assimp/vector2.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 vector2.h
+ *  @brief 2D vector structure, including operators when compiling in C++
+ */
+#pragma once
+#ifndef AI_VECTOR2D_H_INC
+#define AI_VECTOR2D_H_INC
+
+#ifdef __GNUC__
+#   pragma GCC system_header
+#endif
+
+#ifdef __cplusplus
+#   include <cmath>
+#else
+#   include <math.h>
+#endif
+
+#include "defs.h"
+
+// ----------------------------------------------------------------------------------
+/** Represents a two-dimensional vector.
+ */
+
+#ifdef __cplusplus
+template <typename TReal>
+class aiVector2t {
+public:
+    aiVector2t () : x(), y() {}
+    aiVector2t (TReal _x, TReal _y) : x(_x), y(_y) {}
+    explicit aiVector2t (TReal _xyz) : x(_xyz), y(_xyz) {}
+    aiVector2t (const aiVector2t& o) = default;
+
+    void Set( TReal pX, TReal pY);
+    TReal SquareLength() const ;
+    TReal Length() const ;
+    aiVector2t& Normalize();
+
+    const aiVector2t& operator += (const aiVector2t& o);
+    const aiVector2t& operator -= (const aiVector2t& o);
+    const aiVector2t& operator *= (TReal f);
+    const aiVector2t& operator /= (TReal f);
+
+    TReal operator[](unsigned int i) const;
+
+    bool operator== (const aiVector2t& other) const;
+    bool operator!= (const aiVector2t& other) const;
+
+    bool Equal(const aiVector2t &other, TReal epsilon = ai_epsilon) const;
+
+    aiVector2t& operator= (TReal f);
+    const aiVector2t SymMul(const aiVector2t& o);
+
+    template <typename TOther>
+    operator aiVector2t<TOther> () const;
+
+    TReal x, y;
+};
+
+typedef aiVector2t<ai_real> aiVector2D;
+
+#else
+
+struct aiVector2D {
+    ai_real x, y;
+};
+
+#endif // __cplusplus
+
+#endif // AI_VECTOR2D_H_INC