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diff --git a/thirdparty/assimp/code/PostProcessing/DeboneProcess.h b/thirdparty/assimp/code/PostProcessing/DeboneProcess.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.
+
+----------------------------------------------------------------------
+*/
+
+/** Defines a post processing step to limit the number of bones affecting a single vertex. */
+#ifndef AI_DEBONEPROCESS_H_INC
+#define AI_DEBONEPROCESS_H_INC
+
+#include "Common/BaseProcess.h"
+
+#include <assimp/mesh.h>
+#include <assimp/scene.h>
+
+#include <vector>
+#include <utility>
+
+#// Forward declarations
+class DeboneTest;
+
+namespace Assimp {
+
+#if (!defined AI_DEBONE_THRESHOLD)
+#   define AI_DEBONE_THRESHOLD  1.0f
+#endif // !! AI_DEBONE_THRESHOLD
+
+// ---------------------------------------------------------------------------
+/** This post processing step removes bones nearly losslessly or according to
+* a configured threshold. In order to remove the bone, the primitives affected by
+* the bone are split from the mesh. The split off (new) mesh is boneless. At any
+* point in time, bones without affect upon a given mesh are to be removed.
+*/
+class DeboneProcess : public BaseProcess {
+public:
+    DeboneProcess();
+    ~DeboneProcess();
+
+    // -------------------------------------------------------------------
+    /** Returns whether the processing step is present in the given flag.
+    * @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;
+
+    // -------------------------------------------------------------------
+    /** Called prior to ExecuteOnScene().
+    * The function is a request to the process to update its configuration
+    * basing on the Importer's configuration property list.
+    */
+    void SetupProperties(const Importer* pImp);
+
+protected:
+    // -------------------------------------------------------------------
+    /** 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);
+
+    // -------------------------------------------------------------------
+    /** Counts bones total/removable in a given mesh.
+    * @param pMesh The mesh to process.
+    */
+    bool ConsiderMesh( const aiMesh* pMesh);
+
+    /// Splits the given mesh by bone count.
+    /// @param pMesh the Mesh to split. Is not changed at all, but might be superfluous in case it was split.
+    /// @param poNewMeshes Array of submeshes created in the process. Empty if splitting was not necessary.
+    void SplitMesh(const aiMesh* pMesh, std::vector< std::pair< aiMesh*,const aiBone* > >& poNewMeshes) const;
+
+    /// Recursively updates the node's mesh list to account for the changed mesh list
+    void UpdateNode(aiNode* pNode) const;
+
+    // -------------------------------------------------------------------
+    // Apply transformation to a mesh
+    void ApplyTransform(aiMesh* mesh, const aiMatrix4x4& mat)const;
+
+public:
+    /** Number of bones present in the scene. */
+    unsigned int mNumBones;
+    unsigned int mNumBonesCanDoWithout;
+
+    float mThreshold;
+    bool mAllOrNone;
+
+    /// Per mesh index: Array of indices of the new submeshes.
+    std::vector< std::vector< std::pair< unsigned int,aiNode* > > > mSubMeshIndices;
+};
+
+} // end of namespace Assimp
+
+#endif // AI_DEBONEPROCESS_H_INC