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diff --git a/include/drawinglayer/primitive3d/sdrextrudelathetools3d.hxx b/include/drawinglayer/primitive3d/sdrextrudelathetools3d.hxx
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+++ b/include/drawinglayer/primitive3d/sdrextrudelathetools3d.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 INCLUDED_DRAWINGLAYER_PRIMITIVE3D_SDREXTRUDELATHETOOLS3D_HXX
+#define INCLUDED_DRAWINGLAYER_PRIMITIVE3D_SDREXTRUDELATHETOOLS3D_HXX
+
+#include <drawinglayer/drawinglayerdllapi.h>
+
+#include <basegfx/polygon/b3dpolypolygon.hxx>
+#include <basegfx/polygon/b2dpolypolygontools.hxx>
+#include <vector>
+
+
+// predefines
+
+namespace drawinglayer::geometry {
+    class ViewInformation3D;
+}
+
+
+namespace drawinglayer::primitive3d
+    {
+        /** SliceType3D definition */
+        enum SliceType3D
+        {
+            SLICETYPE3D_REGULAR,        // normal geometry Slice3D
+            SLICETYPE3D_FRONTCAP,       // front cap
+            SLICETYPE3D_BACKCAP         // back cap
+        };
+
+        /// class to hold one Slice3D
+        class DRAWINGLAYER_DLLPUBLIC Slice3D final
+        {
+            basegfx::B3DPolyPolygon                 maPolyPolygon;
+            SliceType3D                             maSliceType;
+
+        public:
+            Slice3D(
+                const basegfx::B2DPolyPolygon& rPolyPolygon,
+                const basegfx::B3DHomMatrix& aTransform,
+                SliceType3D aSliceType = SLICETYPE3D_REGULAR)
+            :   maPolyPolygon(basegfx::utils::createB3DPolyPolygonFromB2DPolyPolygon(rPolyPolygon)),
+                maSliceType(aSliceType)
+            {
+                maPolyPolygon.transform(aTransform);
+            }
+
+            // data access
+            const basegfx::B3DPolyPolygon& getB3DPolyPolygon() const { return maPolyPolygon; }
+            SliceType3D getSliceType() const { return maSliceType; }
+        };
+
+        /// typedef for a group of Slice3Ds
+        typedef ::std::vector< Slice3D > Slice3DVector;
+
+        /// helpers for creation
+        void DRAWINGLAYER_DLLPUBLIC createLatheSlices(
+            Slice3DVector& rSliceVector,
+            const basegfx::B2DPolyPolygon& rSource,
+            double fBackScale,
+            double fDiagonal,
+            double fRotation,
+            sal_uInt32 nSteps,
+            bool bCharacterMode,
+            bool bCloseFront,
+            bool bCloseBack);
+
+        void DRAWINGLAYER_DLLPUBLIC createExtrudeSlices(
+            Slice3DVector& rSliceVector,
+            const basegfx::B2DPolyPolygon& rSource,
+            double fBackScale,
+            double fDiagonal,
+            double fDepth,
+            bool bCharacterMode,
+            bool bCloseFront,
+            bool bCloseBack);
+
+        /// helpers for geometry extraction
+        basegfx::B3DPolyPolygon DRAWINGLAYER_DLLPUBLIC extractHorizontalLinesFromSlice(const Slice3DVector& rSliceVector, bool bCloseHorLines);
+        basegfx::B3DPolyPolygon DRAWINGLAYER_DLLPUBLIC extractVerticalLinesFromSlice(const Slice3DVector& rSliceVector);
+
+        void DRAWINGLAYER_DLLPUBLIC extractPlanesFromSlice(
+            ::std::vector< basegfx::B3DPolyPolygon >& rFill,
+            const Slice3DVector& rSliceVector,
+            bool bCreateNormals,
+            bool bSmoothNormals,
+            bool bSmoothLids,
+            bool bClosed,
+            double fSmoothNormalsMix,
+            double fSmoothLidsMix,
+            bool bCreateTextureCoordinates,
+            const basegfx::B2DHomMatrix& rTexTransform);
+
+        void DRAWINGLAYER_DLLPUBLIC createReducedOutlines(
+            const geometry::ViewInformation3D& rViewInformation,
+            const basegfx::B3DHomMatrix& rObjectTransform,
+            const basegfx::B3DPolygon& rLoopA,
+            const basegfx::B3DPolygon& rLoopB,
+            basegfx::B3DPolyPolygon& rTarget);
+
+} // end of namespace drawinglayer::overlay
+
+
+#endif //_DRAWINGLAYER_PRIMITIVE3D_SDREXTRUDELATHETOOLS3D_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */