/home/cube/sources/osgearth/src/osgEarthUtil/ClampCallback

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/* -*-c++-*- */
/* osgEarth - Dynamic map generation toolkit for OpenSceneGraph
* Copyright 2008-2010 Pelican Mapping
* http://osgearth.org
*
* osgEarth is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program.  If not, see <http://www.gnu.org/licenses/>
*/

#ifndef OSGEARTHUTIL_CLAMPCALLBACK
#define OSGEARTHUTIL_CLAMPCALLBACK

#include <osg/NodeCallback>
#include <osg/CoordinateSystemNode>


#include <osgEarth/FindNode>
#include <osgEarth/MapNode>

#include <osgEarthUtil/Common>

namespace osgEarth { namespace Util
{       

        class OSGEARTHUTIL_EXPORT ClampCallback : public osg::NodeCallback
        {
        public:
        ClampCallback(osg::Node* terrainNode = NULL);

        void setTerrainNode(osg::Node* terrainNode);

        osg::Node* getTerrainNode() const { return _terrainNode.get(); }

        double getOffset() const { return _offset;}

        void setOffset(double offset);

        void setIntersectionMask(unsigned int intersectionMask);

        unsigned int getIntersectionMask() const;

                virtual void operator()(osg::Node* node, osg::NodeVisitor* nv);

        private:

        bool clamp(const osg::Vec3d& pos, osg::Vec3d& out) const;
        bool clampGeometry(osg::Geometry* geom, const osg::Matrixd& localToWorld, const osg::Matrixd& worldToLocal) const;

        unsigned int _intersectionMask;

        osg::observer_ptr<osg::CoordinateSystemNode> _csn;

        osg::ref_ptr< osg::Node > _terrainNode;

        int _lastCulledFrame;

        double _offset;


        };

} } // namespace osgEarth::Util

#endif //OSGEARTHUTIL_CLAMPCALLBACK