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diff --git a/thirdparty/assimp/code/FindInvalidDataProcess.h b/thirdparty/assimp/code/FindInvalidDataProcess.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 an importer's output
+ *   for data that is obviously invalid
+ */
+#ifndef AI_FINDINVALIDDATA_H_INC
+#define AI_FINDINVALIDDATA_H_INC
+
+#include "BaseProcess.h"
+#include <assimp/types.h>
+#include <assimp/anim.h>
+
+struct aiMesh;
+
+class FindInvalidDataProcessTest;
+
+namespace Assimp    {
+
+// ---------------------------------------------------------------------------
+/** The FindInvalidData post-processing step. It searches the mesh data
+ *  for parts that are obviously invalid and removes them.
+ *
+ *  Originally this was a workaround for some models written by Blender
+ *  which have zero normal vectors. */
+class ASSIMP_API FindInvalidDataProcess : public BaseProcess {
+public:
+    FindInvalidDataProcess();
+    ~FindInvalidDataProcess();
+
+    // -------------------------------------------------------------------
+    //
+    bool IsActive( unsigned int pFlags) const;
+
+    // -------------------------------------------------------------------
+    // Setup import settings
+    void SetupProperties(const Importer* pImp);
+
+    // -------------------------------------------------------------------
+    // Run the step
+    void Execute( aiScene* pScene);
+
+    // -------------------------------------------------------------------
+    /** Executes the post-processing step on the given mesh
+     * @param pMesh The mesh to process.
+     * @return 0 - nothing, 1 - removed sth, 2 - please delete me  */
+    int ProcessMesh( aiMesh* pMesh);
+
+    // -------------------------------------------------------------------
+    /** Executes the post-processing step on the given animation
+     * @param anim The animation to process.  */
+    void ProcessAnimation (aiAnimation* anim);
+
+    // -------------------------------------------------------------------
+    /** Executes the post-processing step on the given anim channel
+     * @param anim The animation channel to process.*/
+    void ProcessAnimationChannel (aiNodeAnim* anim);
+
+private:
+    ai_real configEpsilon;
+    bool mIgnoreTexCoods;
+};
+
+} // end of namespace Assimp
+
+#endif // AI_AI_FINDINVALIDDATA_H_INC