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diff --git a/thirdparty/assimp/code/ScenePrivate.h b/thirdparty/assimp/code/ScenePrivate.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 Stuff to deal with aiScene::mPrivate
+ */
+#pragma once
+#ifndef AI_SCENEPRIVATE_H_INCLUDED
+#define AI_SCENEPRIVATE_H_INCLUDED
+
+#include <assimp/ai_assert.h>
+#include <assimp/scene.h>
+
+namespace Assimp {
+
+// Forward declarations
+class Importer;
+
+struct ScenePrivateData {
+    //  The struct constructor.
+    ScenePrivateData() AI_NO_EXCEPT;
+
+    // Importer that originally loaded the scene though the C-API
+    // If set, this object is owned by this private data instance.
+    Assimp::Importer* mOrigImporter;
+
+    // List of post-processing steps already applied to the scene.
+    unsigned int mPPStepsApplied;
+
+    // true if the scene is a copy made with aiCopyScene()
+    // or the corresponding C++ API. This means that user code
+    // may have made modifications to it, so mPPStepsApplied
+    // and mOrigImporter are no longer safe to rely on and only
+    // serve informative purposes.
+    bool mIsCopy;
+};
+
+inline
+ScenePrivateData::ScenePrivateData() AI_NO_EXCEPT
+: mOrigImporter( nullptr )
+, mPPStepsApplied( 0 )
+, mIsCopy( false ) {
+    // empty
+}
+
+// Access private data stored in the scene
+inline
+ScenePrivateData* ScenePriv(aiScene* in) {
+    ai_assert( nullptr != in );
+    if ( nullptr == in ) {
+        return nullptr;
+    }
+    return static_cast<ScenePrivateData*>(in->mPrivate);
+}
+
+inline
+const ScenePrivateData* ScenePriv(const aiScene* in) {
+    ai_assert( nullptr != in );
+    if ( nullptr == in ) {
+        return nullptr;
+    }
+    return static_cast<const ScenePrivateData*>(in->mPrivate);
+}
+
+} // Namespace Assimp
+
+#endif // AI_SCENEPRIVATE_H_INCLUDED