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diff --git a/thirdparty/assimp/code/PostProcessing/FindInstancesProcess.h b/thirdparty/assimp/code/PostProcessing/FindInstancesProcess.h
deleted file mode 100644
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--- a/thirdparty/assimp/code/PostProcessing/FindInstancesProcess.h
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@@ -1,137 +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  FindInstancesProcess.h
- *  @brief Declares the aiProcess_FindInstances post-process step
- */
-#ifndef AI_FINDINSTANCES_H_INC
-#define AI_FINDINSTANCES_H_INC
-
-#include "Common/BaseProcess.h"
-#include "PostProcessing/ProcessHelper.h"
-
-class FindInstancesProcessTest;
-namespace Assimp    {
-
-// -------------------------------------------------------------------------------
-/** @brief Get a pseudo(!)-hash representing a mesh.
- *
- *  The hash is built from number of vertices, faces, primitive types,
- *  .... but *not* from the real mesh data. The funcction is not a perfect hash.
- *  @param in Input mesh
- *  @return Hash.
- */
-inline
-uint64_t GetMeshHash(aiMesh* in) {
-    ai_assert(nullptr != in);
-
-    // ... get an unique value representing the vertex format of the mesh
-    const unsigned int fhash = GetMeshVFormatUnique(in);
-
-    // and bake it with number of vertices/faces/bones/matidx/ptypes
-    return ((uint64_t)fhash << 32u) | ((
-        (in->mNumBones << 16u) ^  (in->mNumVertices)       ^
-        (in->mNumFaces<<4u)    ^  (in->mMaterialIndex<<15) ^
-        (in->mPrimitiveTypes<<28)) & 0xffffffff );
-}
-
-// -------------------------------------------------------------------------------
-/** @brief Perform a component-wise comparison of two arrays
- *
- *  @param first First array
- *  @param second Second array
- *  @param size Size of both arrays
- *  @param e Epsilon
- *  @return true if the arrays are identical
- */
-inline
-bool CompareArrays(const aiVector3D* first, const aiVector3D* second,
-        unsigned int size, float e) {
-    for (const aiVector3D* end = first+size; first != end; ++first,++second) {
-        if ( (*first - *second).SquareLength() >= e)
-            return false;
-    }
-    return true;
-}
-
-// and the same for colors ...
-inline bool CompareArrays(const aiColor4D* first, const aiColor4D* second,
-    unsigned int size, float e)
-{
-    for (const aiColor4D* end = first+size; first != end; ++first,++second) {
-        if ( GetColorDifference(*first,*second) >= e)
-            return false;
-    }
-    return true;
-}
-
-// ---------------------------------------------------------------------------
-/** @brief A post-processing steps to search for instanced meshes
-*/
-class FindInstancesProcess : public BaseProcess
-{
-public:
-
-    FindInstancesProcess();
-    ~FindInstancesProcess();
-
-public:
-    // -------------------------------------------------------------------
-    // Check whether step is active in given flags combination
-    bool IsActive( unsigned int pFlags) const;
-
-    // -------------------------------------------------------------------
-    // Execute step on a given scene
-    void Execute( aiScene* pScene);
-
-    // -------------------------------------------------------------------
-    // Setup properties prior to executing the process
-    void SetupProperties(const Importer* pImp);
-
-private:
-
-    bool configSpeedFlag;
-
-}; // ! end class FindInstancesProcess
-}  // ! end namespace Assimp
-
-#endif // !! AI_FINDINSTANCES_H_INC