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diff --git a/libs/assimp/tools/assimp_view/Camera.h b/libs/assimp/tools/assimp_view/Camera.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.
+---------------------------------------------------------------------------
+*/
+
+#if (!defined AV_CAMERA_H_INCLUDED)
+#define AV_CAMERA_H_INCLUDED
+
+//-------------------------------------------------------------------------------
+/** \brief Camera class
+*/
+//-------------------------------------------------------------------------------
+class Camera
+    {
+    public:
+
+
+        Camera ()
+            :
+
+            vPos(0.0f,0.0f,-10.0f),
+            vUp(0.0f,1.0f,0.0f),
+            vLookAt(0.0f,0.0f,1.0f),
+            vRight(0.0f,1.0f,0.0f)
+            {
+
+            }
+    public:
+
+        // position of the camera
+        aiVector3D vPos;
+
+        // up-vector of the camera
+        aiVector3D vUp;
+
+        // camera's looking point is vPos + vLookAt
+        aiVector3D vLookAt;
+
+        // right vector of the camera
+        aiVector3D vRight;
+
+
+        // Equation
+        // (vRight ^ vUp) - vLookAt == 0
+        // needn't apply
+
+    } ;
+
+#endif // !!IG