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diff --git a/include/drawinglayer/primitive3d/sdrextrudeprimitive3d.hxx b/include/drawinglayer/primitive3d/sdrextrudeprimitive3d.hxx
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+++ b/include/drawinglayer/primitive3d/sdrextrudeprimitive3d.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_SDREXTRUDEPRIMITIVE3D_HXX
+#define INCLUDED_DRAWINGLAYER_PRIMITIVE3D_SDREXTRUDEPRIMITIVE3D_HXX
+
+#include <drawinglayer/drawinglayerdllapi.h>
+
+#include <drawinglayer/geometry/viewinformation3d.hxx>
+#include <drawinglayer/primitive3d/sdrprimitive3d.hxx>
+#include <basegfx/polygon/b2dpolypolygon.hxx>
+#include <optional>
+
+
+namespace drawinglayer::primitive3d
+    {
+        /** SdrExtrudePrimitive3D class
+
+            This 3D primitive expands the SdrPrimitive3D to a 3D extrude definition.
+            The given 2D tools::PolyPolygon geometry is imagined as lying on the XY-plane in 3D
+            and gets extruded in Z-Direction by Depth.
+
+            Various possibilities e.g. for creating diagonals (edge roudings in 3D)
+            and similar are given.
+
+            The decomposition will create all necessary 3D planes for visualisation.
+         */
+        class DRAWINGLAYER_DLLPUBLIC SdrExtrudePrimitive3D final : public SdrPrimitive3D
+        {
+        private:
+            /// geometry helper for slices
+            basegfx::B2DPolyPolygon                     maCorrectedPolyPolygon;
+            Slice3DVector                               maSlices;
+
+            /// primitive geometry data
+            basegfx::B2DPolyPolygon                     maPolyPolygon;
+            double                                      mfDepth;
+            double                                      mfDiagonal;
+            double                                      mfBackScale;
+
+            /// decomposition data when ReducedLineGeometry is used, see get3DDecomposition
+            std::optional<geometry::ViewInformation3D> mpLastRLGViewInformation;
+
+            bool                                        mbSmoothNormals : 1; // Plane self
+            bool                                        mbSmoothLids : 1; // Front/back
+            bool                                        mbCharacterMode : 1;
+            bool                                        mbCloseFront : 1;
+            bool                                        mbCloseBack : 1;
+
+            /// create slices
+            void impCreateSlices();
+
+            /// get (evtl. create) slices
+            const Slice3DVector& getSlices() const;
+
+            /// local decomposition.
+            virtual Primitive3DContainer create3DDecomposition(const geometry::ViewInformation3D& rViewInformation) const override;
+
+        public:
+            /// constructor
+            SdrExtrudePrimitive3D(
+                const basegfx::B3DHomMatrix& rTransform,
+                const basegfx::B2DVector& rTextureSize,
+                const attribute::SdrLineFillShadowAttribute3D& rSdrLFSAttribute,
+                const attribute::Sdr3DObjectAttribute& rSdr3DObjectAttribute,
+                const basegfx::B2DPolyPolygon& rPolyPolygon,
+                double fDepth,
+                double fDiagonal,
+                double fBackScale,
+                bool bSmoothNormals,
+                bool bSmoothLids,
+                bool bCharacterMode,
+                bool bCloseFront,
+                bool bCloseBack);
+            virtual ~SdrExtrudePrimitive3D() override;
+
+            /// data read access
+            const basegfx::B2DPolyPolygon& getPolyPolygon() const { return maPolyPolygon; }
+            double getDepth() const { return mfDepth; }
+            double getDiagonal() const { return mfDiagonal; }
+            double getBackScale() const { return mfBackScale; }
+            bool getSmoothNormals() const { return mbSmoothNormals; }
+            bool getSmoothLids() const { return mbSmoothLids; }
+            bool getCharacterMode() const { return mbCharacterMode; }
+            bool getCloseFront() const { return mbCloseFront; }
+            bool getCloseBack() const { return mbCloseBack; }
+
+            /// compare operator
+            virtual bool operator==(const BasePrimitive3D& rPrimitive) const override;
+
+            /// get range
+            virtual basegfx::B3DRange getB3DRange(const geometry::ViewInformation3D& rViewInformation) const override;
+
+            /// Overridden to allow for reduced line mode to decide if to buffer decomposition or not
+            virtual Primitive3DContainer get3DDecomposition(const geometry::ViewInformation3D& rViewInformation) const override;
+
+            /// provide unique ID
+            DeclPrimitive3DIDBlock()
+        };
+
+} // end of namespace drawinglayer::primitive3d
+
+
+#endif //INCLUDED_DRAWINGLAYER_PRIMITIVE3D_SDREXTRUDEPRIMITIVE3D_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */