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diff --git a/thirdparty/assimp/code/ScenePreprocessor.h b/thirdparty/assimp/code/ScenePreprocessor.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 search all meshes for
+  degenerated faces */
+#ifndef AI_SCENE_PREPROCESSOR_H_INC
+#define AI_SCENE_PREPROCESSOR_H_INC
+
+#include <assimp/defs.h>
+#include <stddef.h>
+
+struct aiScene;
+struct aiAnimation;
+struct aiMesh;
+
+class ScenePreprocessorTest;
+namespace Assimp    {
+
+// ----------------------------------------------------------------------------------
+/** ScenePreprocessor: Preprocess a scene before any post-processing
+ *  steps are executed.
+ *
+ *  The step computes data that needn't necessarily be provided by the
+ *  importer, such as aiMesh::mPrimitiveTypes.
+*/
+// ----------------------------------------------------------------------------------
+class ASSIMP_API ScenePreprocessor
+{
+    // Make ourselves a friend of the corresponding test unit.
+    friend class ::ScenePreprocessorTest;
+public:
+
+    // ----------------------------------------------------------------
+    /** Default c'tpr. Use SetScene() to assign a scene to the object.
+     */
+    ScenePreprocessor()
+        :   scene   (NULL)
+    {}
+
+    /** Constructs the object and assigns a specific scene to it
+     */
+    ScenePreprocessor(aiScene* _scene)
+        :   scene   (_scene)
+    {}
+
+    // ----------------------------------------------------------------
+    /** Assign a (new) scene to the object.
+     *
+     *  One 'SceneProcessor' can be used for multiple scenes.
+     *  Call ProcessScene to have the scene preprocessed.
+     *  @param sc Scene to be processed.
+     */
+    void SetScene (aiScene* sc) {
+        scene = sc;
+    }
+
+    // ----------------------------------------------------------------
+    /** Preprocess the current scene
+     */
+    void ProcessScene ();
+
+protected:
+
+    // ----------------------------------------------------------------
+    /** Preprocess an animation in the scene
+     *  @param anim Anim to be preprocessed.
+     */
+    void ProcessAnimation (aiAnimation* anim);
+
+
+    // ----------------------------------------------------------------
+    /** Preprocess a mesh in the scene
+     *  @param mesh Mesh to be preprocessed.
+     */
+    void ProcessMesh (aiMesh* mesh);
+
+protected:
+
+    //! Scene we're currently working on
+    aiScene* scene;
+};
+
+
+} // ! end namespace Assimp
+
+#endif // include guard