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diff --git a/src/mesh/assimp-master/tools/assimp_view/LogWindow.h b/src/mesh/assimp-master/tools/assimp_view/LogWindow.h
new file mode 100644
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+++ b/src/mesh/assimp-master/tools/assimp_view/LogWindow.h
@@ -0,0 +1,133 @@
+/*
+---------------------------------------------------------------------------
+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.
+---------------------------------------------------------------------------
+*/
+
+#if (!defined AV_LOG_WINDOW_H_INCLUDED)
+#define AV_LOG_WINDOW_H_INCLUDE
+
+namespace AssimpView
+{
+
+
+    //-------------------------------------------------------------------------------
+    /** \brief Subclass of Assimp::LogStream used to add all log messages to the
+     *         log window.
+     */
+    //-------------------------------------------------------------------------------
+    class CMyLogStream : public Assimp::LogStream
+    {
+    public:
+        /** @brief  Implementation of the abstract method   */
+        void write( const char* message );
+    };
+
+
+    //-------------------------------------------------------------------------------
+    /** \brief Class to display log strings in a separate window
+    */
+    //-------------------------------------------------------------------------------
+    class CLogWindow
+    {
+    private:
+
+        friend class CMyLogStream;
+        friend INT_PTR CALLBACK LogDialogProc( HWND hwndDlg, UINT uMsg,
+            WPARAM wParam, LPARAM lParam );
+
+        CLogWindow() : hwnd( NULL ), bIsVisible( false ), bUpdate( true ) {}
+
+    public:
+
+
+        // Singleton accessors
+        static CLogWindow s_cInstance;
+        inline static CLogWindow& Instance()
+        {
+            return s_cInstance;
+        }
+
+        // initializes the log window
+        void Init();
+
+        // Shows the log window
+        void Show();
+
+        // Clears the log window
+        void Clear();
+
+        // Save the log window to an user-defined file
+        void Save();
+
+        // write a line to the log window
+        void WriteLine( const char* message );
+
+        // Set the bUpdate member
+        inline void SetAutoUpdate( bool b )
+        {
+            this->bUpdate = b;
+        }
+
+        // updates the log file
+        void Update();
+
+    private:
+
+        // Window handle
+        HWND hwnd;
+
+        // current text of the window (contains RTF tags)
+        std::string szText;
+        std::string szPlainText;
+
+        // is the log window currently visible?
+        bool bIsVisible;
+
+        // Specified whether each new log message updates the log automatically
+        bool bUpdate;
+
+
+    public:
+        // associated log stream
+        CMyLogStream* pcStream;
+    };
+
+}
+
+#endif // AV_LOG_DISPLA