//C++ header - Open Scene Graph - Copyright (C) 1998-2002 Robert Osfield
//Distributed under the terms of the GNU Library General Public License (LGPL)
//as published by the Free Software Foundation.

#ifndef OSG_OCCLUDERNODE
#define OSG_OCCLUDERNODE 1

#include <osg/Group>
#include <osg/ConvexPlanarOccluder>

namespace osg {

/** OccluderNode is a Group node which allows OccluderNodeing between children.
    Typical uses would be for objects which might need to be rendered
    differently at different times, for instance a OccluderNode could be used 
    to represent the different states of a traffic light.
*/
class SG_EXPORT OccluderNode : public Group
{
    public :
        
        OccluderNode();

        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
        OccluderNode(const OccluderNode&,const CopyOp& copyop=CopyOp::SHALLOW_COPY);

        META_Node(osg, OccluderNode);
        

        /** Attach a ConvexPlanarOccluder to an OccluderNode.*/            
        void setOccluder(ConvexPlanarOccluder* occluder) { _occluder = occluder; }
        
        /** Get the ConvexPlanarOccluder* attached to a OccluderNode. */
        ConvexPlanarOccluder* getOccluder() { return _occluder.get(); }
        
        /** Get the const ConvexPlanarOccluder* attached to a OccluderNode.*/            
        const ConvexPlanarOccluder* getOccluder() const { return _occluder.get(); }


    protected :
    
        virtual ~OccluderNode() {}
        
        /** Override's Group's computeBound.*/
        virtual bool computeBound() const;

        ref_ptr<ConvexPlanarOccluder>   _occluder;
};

}

#endif