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diff --git a/source/blender/freestyle/intern/view_map/Pow23GridDensityProvider.h b/source/blender/freestyle/intern/view_map/Pow23GridDensityProvider.h
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+//
+//  Filename         : Pow23GridDensityProvider.h
+//  Author(s)        : Alexander Beels
+//  Purpose          : Class to define a cell grid surrounding
+//                     the projected image of a scene
+//  Date of creation : 2011-2-8
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+//
+//  Copyright (C) : Please refer to the COPYRIGHT file distributed 
+//   with this source distribution. 
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License
+//  as published by the Free Software Foundation; either version 2
+//  of the License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef POW23GRIDDENSITYPROVIDER_H
+#define POW23GRIDDENSITYPROVIDER_H
+
+#include "GridDensityProvider.h"
+
+class Pow23GridDensityProvider : public GridDensityProvider {
+	// Disallow copying and assignment
+	Pow23GridDensityProvider (const Pow23GridDensityProvider& other);
+	Pow23GridDensityProvider& operator= (const Pow23GridDensityProvider& other);
+
+public:
+	Pow23GridDensityProvider(OccluderSource& source, const real proscenium[4], unsigned numFaces);
+	Pow23GridDensityProvider(OccluderSource& source, const BBox<Vec3r>& bbox, const GridHelpers::Transform& transform, unsigned numFaces);
+	Pow23GridDensityProvider(OccluderSource& source, unsigned numFaces);
+	virtual ~Pow23GridDensityProvider ();
+
+protected:
+	unsigned numFaces;
+
+private:
+	void initialize (const real proscenium[4]); 
+};
+
+class Pow23GridDensityProviderFactory : public GridDensityProviderFactory {
+public:
+	Pow23GridDensityProviderFactory(unsigned numFaces);
+	~Pow23GridDensityProviderFactory ();
+
+	auto_ptr<GridDensityProvider> newGridDensityProvider(OccluderSource& source, const real proscenium[4]);
+	auto_ptr<GridDensityProvider> newGridDensityProvider(OccluderSource& source, const BBox<Vec3r>& bbox, const GridHelpers::Transform& transform);
+	auto_ptr<GridDensityProvider> newGridDensityProvider(OccluderSource& source);
+protected:
+	unsigned numFaces;
+};
+
+#endif // POW23GRIDDENSITYPROVIDER_H
+