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diff --git a/libs/assimp/code/PostProcessing/SplitLargeMeshes.h b/libs/assimp/code/PostProcessing/SplitLargeMeshes.h
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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, 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 split large meshes into sub-meshes
+ */
+#ifndef AI_SPLITLARGEMESHES_H_INC
+#define AI_SPLITLARGEMESHES_H_INC
+
+#include <vector>
+#include "Common/BaseProcess.h"
+
+#include <assimp/mesh.h>
+#include <assimp/scene.h>
+
+// Forward declarations
+class SplitLargeMeshesTest;
+
+namespace Assimp {
+
+class SplitLargeMeshesProcess_Triangle;
+class SplitLargeMeshesProcess_Vertex;
+
+// NOTE: If you change these limits, don't forget to change the
+// corresponding values in all Assimp ports
+
+// **********************************************************
+// Java: ConfigProperty.java,
+//  ConfigProperty.DEFAULT_VERTEX_SPLIT_LIMIT
+//  ConfigProperty.DEFAULT_TRIANGLE_SPLIT_LIMIT
+// **********************************************************
+
+// default limit for vertices
+#if (!defined AI_SLM_DEFAULT_MAX_VERTICES)
+#   define AI_SLM_DEFAULT_MAX_VERTICES      1000000
+#endif
+
+// default limit for triangles
+#if (!defined AI_SLM_DEFAULT_MAX_TRIANGLES)
+#   define AI_SLM_DEFAULT_MAX_TRIANGLES     1000000
+#endif
+
+// ---------------------------------------------------------------------------
+/** Post-processing filter to split large meshes into sub-meshes
+ *
+ * Applied BEFORE the JoinVertices-Step occurs.
+ * Returns NON-UNIQUE vertices, splits by triangle number.
+*/
+class ASSIMP_API SplitLargeMeshesProcess_Triangle : public BaseProcess
+{
+    friend class SplitLargeMeshesProcess_Vertex;
+
+public:
+
+    SplitLargeMeshesProcess_Triangle();
+    ~SplitLargeMeshesProcess_Triangle();
+
+public:
+    // -------------------------------------------------------------------
+    /** 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.
+    */
+    virtual void SetupProperties(const Importer* pImp);
+
+
+    //! Set the split limit - needed for unit testing
+    inline void SetLimit(unsigned int l)
+        {LIMIT = l;}
+
+    //! Get the split limit
+    inline unsigned int GetLimit() const
+        {return LIMIT;}
+
+public:
+
+    // -------------------------------------------------------------------
+    /** 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);
+
+    // -------------------------------------------------------------------
+    //! Apply the algorithm to a given mesh
+    void SplitMesh (unsigned int a, aiMesh* pcMesh,
+        std::vector<std::pair<aiMesh*, unsigned int> >& avList);
+
+    // -------------------------------------------------------------------
+    //! Update a node in the asset after a few of its meshes
+    //! have been split
+    static void UpdateNode(aiNode* pcNode,
+        const std::vector<std::pair<aiMesh*, unsigned int> >& avList);
+
+public:
+    //! Triangle limit
+    unsigned int LIMIT;
+};
+
+
+// ---------------------------------------------------------------------------
+/** Post-processing filter to split large meshes into sub-meshes
+ *
+ * Applied AFTER the JoinVertices-Step occurs.
+ * Returns UNIQUE vertices, splits by vertex number.
+*/
+class ASSIMP_API SplitLargeMeshesProcess_Vertex : public BaseProcess
+{
+public:
+
+    SplitLargeMeshesProcess_Vertex();
+    ~SplitLargeMeshesProcess_Vertex();
+
+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;
+
+    // -------------------------------------------------------------------
+    /** Called prior to ExecuteOnScene().
+    * The function is a request to the process to update its configuration
+    * basing on the Importer's configuration property list.
+    */
+    virtual void SetupProperties(const Importer* pImp);
+
+
+    //! Set the split limit - needed for unit testing
+    inline void SetLimit(unsigned int l)
+        {LIMIT = l;}
+
+    //! Get the split limit
+    inline unsigned int GetLimit() const
+        {return LIMIT;}
+
+public:
+
+    // -------------------------------------------------------------------
+    /** 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);
+
+    // -------------------------------------------------------------------
+    //! Apply the algorithm to a given mesh
+    void SplitMesh (unsigned int a, aiMesh* pcMesh,
+        std::vector<std::pair<aiMesh*, unsigned int> >& avList);
+
+    // NOTE: Reuse SplitLargeMeshesProcess_Triangle::UpdateNode()
+
+public:
+    //! Triangle limit
+    unsigned int LIMIT;
+};
+
+} // end of namespace Assimp
+
+#endif // !!AI_SPLITLARGEMESHES_H_INC