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diff --git a/src/mesh/assimp-master/port/dAssimp/assimp/math.d b/src/mesh/assimp-master/port/dAssimp/assimp/math.d
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (ASSIMP)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, ASSIMP Development 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 Development 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.
+---------------------------------------------------------------------------
+*/
+
+/**
+ * Mathematical structures in which the imported data is stored.
+ */
+module assimp.math;
+
+extern( C ) {
+   /**
+    * Represents a two-dimensional vector.
+    */
+   struct aiVector2D {
+   align ( 1 ):
+      float x, y;
+   }
+
+   /**
+    * Represents a three-dimensional vector.
+    */
+   struct aiVector3D {
+   align ( 1 ):
+      float x, y, z;
+   }
+
+   /**
+    * Represents a quaternion.
+    */
+   struct aiQuaternion {
+      float w, x, y, z;
+   }
+
+   /**
+    * Represents a row-major 3x3 matrix
+    *
+    * There is much confusion about matrix layouts (column vs. row order). This
+    * is <em>always</em> a row-major matrix, even when using the
+    * <code>ConvertToLeftHanded</code> post processing step.
+    */
+   struct aiMatrix3x3 {
+      float a1, a2, a3;
+      float b1, b2, b3;
+      float c1, c2, c3;
+   }
+
+   /**
+    * Represents a row-major 3x3 matrix
+    *
+    * There is much confusion about matrix layouts (column vs. row order). This
+    * is <em>always</em> a row-major matrix, even when using the
+    * <code>ConvertToLeftHanded</code> post processing step.
+    */
+   struct aiMatrix4x4 {
+   align ( 1 ):
+      float a1, a2, a3, a4;
+      float b1, b2, b3, b4;
+      float c1, c2, c3, c4;
+      float d1, d2, d3, d4;
+   }
+
+   /**
+    * Represents a plane in a three-dimensional, euclidean space
+    */
+   struct aiPlane {
+   align ( 1 ):
+      /**
+       * Coefficients of the plane equation (<code>ax + by + cz = d</code>).
+       */
+      float a;
+      float b; /// ditto
+      float c; /// ditto
+      float d; /// ditto
+   }
+
+   /**
+    * Represents a ray.
+    */
+   struct aiRay {
+   align ( 1 ):
+      /**
+       * Origin of the ray.
+       */
+      aiVector3D pos;
+
+      /**
+       * Direction of the ray.
+       */
+      aiVector3D dir;
+   }
+
+   /**
+    * Represents a color in RGB space.
+    */
+   struct aiColor3D {
+   align ( 1 ):
+      /**
+       * Red, green and blue values.
+       */
+      float r;
+      float g; /// ditto
+      float b; /// ditto
+   }
+
+   /**
+    * Represents a color in RGB space including an alpha component.
+    */
+   struct aiColor4D {
+   align ( 1 ):
+      /**
+       * Red, green, blue and alpha values.
+       */
+      float r;
+      float g; /// ditto
+      float b; /// ditto
+      float a; /// ditto
+   }
+}