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diff --git a/src/mesh/assimp-master/include/assimp/MathFunctions.h b/src/mesh/assimp-master/include/assimp/MathFunctions.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.
+---------------------------------------------------------------------------
+*/
+
+#pragma once
+
+#ifdef __GNUC__
+#   pragma GCC system_header
+#endif
+
+/** @file  MathFunctions.h
+*  @brief Implementation of math utility functions.
+ *
+*/
+
+#include <limits>
+
+namespace Assimp {
+namespace Math {
+
+/// @brief  Will return the greatest common divisor.
+/// @param  a   [in] Value a.
+/// @param  b   [in] Value b.
+/// @return The greatest common divisor.
+template <typename IntegerType>
+inline IntegerType gcd( IntegerType a, IntegerType b ) {
+	const IntegerType zero = (IntegerType)0;
+	while ( true ) {
+		if ( a == zero ) {
+			return b;
+        }
+		b %= a;
+
+		if ( b == zero ) {
+			return a;
+        }
+		a %= b;
+	}
+}
+
+/// @brief  Will return the greatest common divisor.
+/// @param  a   [in] Value a.
+/// @param  b   [in] Value b.
+/// @return The greatest common divisor.
+template < typename IntegerType >
+inline IntegerType lcm( IntegerType a, IntegerType b ) {
+	const IntegerType t = gcd (a,b);
+	if (!t) {
+        return t;
+    }
+	return a / t * b;
+}
+/// @brief  Will return the smallest epsilon-value for the requested type.
+/// @return The numercical limit epsilon depending on its type.
+template<class T>
+inline T getEpsilon() {
+    return std::numeric_limits<T>::epsilon();
+}
+
+/// @brief  Will return the constant PI for the requested type.
+/// @return Pi
+template<class T>
+inline T aiPi() {
+    return static_cast<T>(3.14159265358979323846);
+}
+
+} // namespace Math
+} // namespace Assimp