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diff --git a/thirdparty/assimp/code/TriangulateProcess.h b/thirdparty/assimp/code/TriangulateProcess.h
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2019, 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 post processing step to triangulate all faces
+          with more than three vertices.
+ */
+#ifndef AI_TRIANGULATEPROCESS_H_INC
+#define AI_TRIANGULATEPROCESS_H_INC
+
+#include "BaseProcess.h"
+
+struct aiMesh;
+
+class TriangulateProcessTest;
+
+namespace Assimp {
+
+// ---------------------------------------------------------------------------
+/** The TriangulateProcess splits up all faces with more than three indices
+ * into triangles. You usually want this to happen because the graphics cards
+ * need their data as triangles.
+ */
+class ASSIMP_API TriangulateProcess : public BaseProcess
+{
+public:
+
+    TriangulateProcess();
+    ~TriangulateProcess();
+
+public:
+    // -------------------------------------------------------------------
+    /** Returns whether the processing step is present in the given flag field.
+     * @param pFlags The processing flags the importer was called with. A bitwise
+     *   combination of #aiPostProcessSteps.
+     * @return true if the process is present in this flag fields, false if not.
+    */
+    bool IsActive( unsigned int pFlags) const;
+
+    // -------------------------------------------------------------------
+    /** Executes the post processing step on the given imported data.
+    * At the moment a process is not supposed to fail.
+    * @param pScene The imported data to work at.
+    */
+    void Execute( aiScene* pScene);
+
+public:
+    // -------------------------------------------------------------------
+    /** Triangulates the given mesh.
+     * @param pMesh The mesh to triangulate.
+     */
+    bool TriangulateMesh( aiMesh* pMesh);
+};
+
+} // end of namespace Assimp
+
+#endif // AI_TRIANGULATEPROCESS_H_INC