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diff --git a/libs/assimp/tools/assimp_view/Background.h b/libs/assimp/tools/assimp_view/Background.h
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+++ b/libs/assimp/tools/assimp_view/Background.h
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+/*
+---------------------------------------------------------------------------
+Open Asset Import Library (assimp)
+---------------------------------------------------------------------------
+
+Copyright (c) 2006-2020, 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.
+---------------------------------------------------------------------------
+*/
+#pragma once
+
+namespace AssimpView
+{
+
+    class CBackgroundPainter
+    {
+        CBackgroundPainter()
+            :
+            clrColor( D3DCOLOR_ARGB( 0xFF, 100, 100, 100 ) ),
+            pcTexture( NULL ),
+            piSkyBoxEffect( NULL ),
+            eMode( SIMPLE_COLOR )
+        {}
+
+    public:
+
+        // Supported background draw modi
+        enum MODE { SIMPLE_COLOR, TEXTURE_2D, TEXTURE_CUBE };
+
+        // Singleton accessors
+        static CBackgroundPainter s_cInstance;
+        inline static CBackgroundPainter& Instance()
+        {
+            return s_cInstance;
+        }
+
+        // set the current background color
+        // (this removes any textures loaded)
+        void SetColor( D3DCOLOR p_clrNew );
+
+        // Setup a cubemap/a 2d texture as background
+        void SetCubeMapBG( const char* p_szPath );
+        void SetTextureBG( const char* p_szPath );
+
+        // Called by the render loop
+        void OnPreRender();
+        void OnPostRender();
+
+        // Release any native resources associated with the instance
+        void ReleaseNativeResource();
+
+        // Recreate any native resources associated with the instance
+        void RecreateNativeResource();
+
+        // Rotate the skybox
+        void RotateSB( const aiMatrix4x4* pm );
+
+        // Reset the state of the skybox
+        void ResetSB();
+
+        inline MODE GetMode() const
+        {
+            return this->eMode;
+        }
+
+        inline IDirect3DBaseTexture9* GetTexture()
+        {
+            return this->pcTexture;
+        }
+
+        inline ID3DXBaseEffect* GetEffect()
+        {
+            return this->piSkyBoxEffect;
+        }
+
+    private:
+
+        void RemoveSBDeps();
+
+        // current background color
+        D3DCOLOR clrColor;
+
+        // current background texture
+        IDirect3DBaseTexture9* pcTexture;
+        ID3DXEffect* piSkyBoxEffect;
+
+        // current background mode
+        MODE eMode;
+
+        // path to the texture
+        std::string szPath;
+
+        // transformation matrix for the skybox
+        aiMatrix4x4 mMatrix;
+    };
+
+}