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diff --git a/thirdparty/assimp/code/RemoveRedundantMaterials.h b/thirdparty/assimp/code/RemoveRedundantMaterials.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 RemoveRedundantMaterials.h
+ *  @brief Defines a post processing step to remove redundant materials
+ */
+#ifndef AI_REMOVEREDUNDANTMATERIALS_H_INC
+#define AI_REMOVEREDUNDANTMATERIALS_H_INC
+
+#include "BaseProcess.h"
+#include <assimp/mesh.h>
+
+class RemoveRedundantMatsTest;
+
+namespace Assimp    {
+
+// ---------------------------------------------------------------------------
+/** RemoveRedundantMatsProcess: Post-processing step to remove redundant
+ *  materials from the imported scene.
+ */
+class ASSIMP_API RemoveRedundantMatsProcess : public BaseProcess
+{
+public:
+    /// The default class constructor.
+    RemoveRedundantMatsProcess();
+
+    /// The class destructor.
+    ~RemoveRedundantMatsProcess();
+
+public:
+    // -------------------------------------------------------------------
+    // Check whether step is active
+    bool IsActive( unsigned int pFlags) const;
+
+    // -------------------------------------------------------------------
+    // Execute step on a given scene
+    void Execute( aiScene* pScene);
+
+    // -------------------------------------------------------------------
+    // Setup import settings
+    void SetupProperties(const Importer* pImp);
+
+
+    // -------------------------------------------------------------------
+    /** @brief Set list of fixed (unmutable) materials
+     *  @param fixed See #AI_CONFIG_PP_RRM_EXCLUDE_LIST
+     */
+    void SetFixedMaterialsString(const std::string& fixed = "") {
+        configFixedMaterials = fixed;
+    }
+
+    // -------------------------------------------------------------------
+    /** @brief Get list of fixed (unmutable) materials
+     *  @return See #AI_CONFIG_PP_RRM_EXCLUDE_LIST
+     */
+    const std::string& GetFixedMaterialsString() const {
+        return configFixedMaterials;
+    }
+
+private:
+
+    //! Configuration option: list of all fixed materials
+    std::string configFixedMaterials;
+};
+
+} // end of namespace Assimp
+
+#endif // !!AI_REMOVEREDUNDANTMATERIALS_H_INC