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diff --git a/thirdparty/assimp/code/PostProcessing/OptimizeGraph.h b/thirdparty/assimp/code/PostProcessing/OptimizeGraph.h
deleted file mode 100644
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--- a/thirdparty/assimp/code/PostProcessing/OptimizeGraph.h
+++ /dev/null
@@ -1,140 +0,0 @@
-/*
-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  OptimizeGraph.h
- *  @brief Declares a post processing step to optimize the scenegraph
- */
-#ifndef AI_OPTIMIZEGRAPHPROCESS_H_INC
-#define AI_OPTIMIZEGRAPHPROCESS_H_INC
-
-#include "Common/BaseProcess.h"
-#include "PostProcessing/ProcessHelper.h"
-
-#include <assimp/types.h>
-
-#include <set>
-
-// Forward declarations
-struct aiMesh;
-
-class OptimizeGraphProcessTest;
-
-namespace Assimp    {
-
-// -----------------------------------------------------------------------------
-/** @brief Postprocessing step to optimize the scenegraph
- *
- *  The implementation tries to merge nodes, even if they use different
- *  transformations. Animations are preserved.
- *
- *  @see aiProcess_OptimizeGraph for a detailed description of the
- *  algorithm being applied.
- */
-class OptimizeGraphProcess : public BaseProcess {
-public:
-    OptimizeGraphProcess();
-    ~OptimizeGraphProcess();
-
-    // -------------------------------------------------------------------
-    bool IsActive( unsigned int pFlags) const;
-
-    // -------------------------------------------------------------------
-    void Execute( aiScene* pScene);
-
-    // -------------------------------------------------------------------
-    void SetupProperties(const Importer* pImp);
-
-    // -------------------------------------------------------------------
-    /** @brief Add a list of node names to be locked and not modified.
-     *  @param in List of nodes. See #AI_CONFIG_PP_OG_EXCLUDE_LIST for
-     *    format explanations.
-     */
-    inline void AddLockedNodeList(std::string& in) {
-        ConvertListToStrings (in,locked_nodes);
-    }
-
-    // -------------------------------------------------------------------
-    /** @brief Add another node to be locked and not modified.
-     *  @param name Name to be locked
-     */
-    inline void AddLockedNode(std::string& name) {
-        locked_nodes.push_back(name);
-    }
-
-    // -------------------------------------------------------------------
-    /** @brief Remove a node from the list of locked nodes.
-     *  @param name Name to be unlocked
-     */
-    inline void RemoveLockedNode(std::string& name) {
-        locked_nodes.remove(name);
-    }
-
-protected:
-    void CollectNewChildren(aiNode* nd, std::list<aiNode*>& nodes);
-    void FindInstancedMeshes (aiNode* pNode);
-
-private:
-#ifdef AI_OG_USE_HASHING
-    typedef std::set<unsigned int> LockedSetType;
-#else
-    typedef std::set<std::string> LockedSetType;
-#endif
-
-    //! Scene we're working with
-    aiScene* mScene;
-
-    //! List of locked names. Stored is the hash of the name
-    LockedSetType locked;
-
-    //! List of nodes to be locked in addition to those with animations, lights or cameras assigned.
-    std::list<std::string> locked_nodes;
-
-    //! Node counters for logging purposes
-    unsigned int nodes_in,nodes_out, count_merged;
-
-    //! Reference counters for meshes
-    std::vector<unsigned int> meshes;
-};
-
-} // end of namespace Assimp
-
-#endif // AI_OPTIMIZEGRAPHPROCESS_H_INC