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+//
+//  Filename         : OccluderSource.h
+//  Author(s)        : Alexander Beels
+//  Purpose          : Class to define a cell grid surrounding
+//                     the projected image of a scene
+//  Date of creation : 2010-12-21
+//
+///////////////////////////////////////////////////////////////////////////////
+
+
+//
+//  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 OCCLUDERSOURCE_H
+#define OCCLUDERSOURCE_H
+
+#include "../winged_edge/WEdge.h"
+#include "../geometry/GridHelpers.h"
+
+class OccluderSource {
+	// Disallow copying and assignment
+	OccluderSource (const OccluderSource& other);
+	OccluderSource& operator= (const OccluderSource& other);
+
+public:
+	OccluderSource (const GridHelpers::Transform& transform, WingedEdge& we);
+	virtual ~OccluderSource();
+
+	void begin();
+	virtual bool next();
+	bool isValid();
+
+	WFace* getWFace();
+	Polygon3r getCameraSpacePolygon();
+	Polygon3r& getGridSpacePolygon();
+
+	virtual void getOccluderProscenium(real proscenium[4]);
+	virtual real averageOccluderArea();
+
+protected:
+	WingedEdge& wingedEdge;
+	vector<WShape*>::const_iterator currentShape, shapesEnd;
+	vector<WFace*>::const_iterator currentFace, facesEnd;
+
+	bool valid;
+
+	Polygon3r cachedPolygon;
+	const GridHelpers::Transform& transform;
+
+	void buildCachedPolygon();
+};
+
+#endif // OCCLUDERSOURCE_H