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diff --git a/include/svx/e3dsceneupdater.hxx b/include/svx/e3dsceneupdater.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef _E3D_SCENEUPDATER_HXX
+#define _E3D_SCENEUPDATER_HXX
+
+#include <svx/svxdllapi.h>
+
+//////////////////////////////////////////////////////////////////////////////
+// predeclarations
+
+class SdrObject;
+class E3dScene;
+namespace drawinglayer { namespace geometry {
+    class ViewInformation3D;
+}}
+
+//////////////////////////////////////////////////////////////////////////////
+// This class is a helper to encapsulate 3D object changes which shall change the
+// scene's 2D geometry. E.g. when moving one 3D object in a scene, the visualisation
+// would not change since the scene's 2D attributes are defined by it's 2D object
+// transformation and the changed content would be projected to the same 2D bounds
+// as before. To reflect the fact that the 2D positions may 'change' for the user's
+// imagination, it is necessary to calculate a new 2D object transformation of the scene
+// (the SnapRect) using the old 3D transformation stack and the eventually changed
+// 3D content and tu use it. This is only wanted if changes to the scene's
+// content are intended to change the scene's 2D geometry attributes
+
+class SVX_DLLPUBLIC E3DModifySceneSnapRectUpdater
+{
+    // the scene which may be changed. This gets set to the outmost scene
+    // of the to-be-changed 3D object when the scene has a 3d transformation
+    // stack at construction time. In all other cases it's set to zero and
+    // no action needs to be taken
+    E3dScene*                                   mpScene;
+
+    // the 3d transformation stack at the time of construction, valid when
+    // mpScene is not zero
+    drawinglayer::geometry::ViewInformation3D*  mpViewInformation3D;
+
+public:
+    // the constructor evaluates and sets the members at construction time
+    E3DModifySceneSnapRectUpdater(const SdrObject* pObject);
+
+    // the destructor will take action if mpScene is not zero and modify the
+    // 2D geomeztry of the target scene
+    ~E3DModifySceneSnapRectUpdater();
+};
+
+#endif          // _E3D_SCENEUPDATER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */