/* -*-c++-*- OpenSceneGraph - Copyright (C) 1998-2006 Robert Osfield 
 *
 * This library is open source and may be redistributed and/or modified under  
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or 
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 * 
 * This library 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 
 * OpenSceneGraph Public License for more details.
*/

#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 OSG_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(); }

        /** Overrides Group's computeBound.*/
        virtual BoundingSphere computeBound() const;

    protected :
    
        virtual ~OccluderNode() {}
        
        ref_ptr<ConvexPlanarOccluder>   _occluder;
};

}

#endif
