CreatePlanarShadowVisitor.h

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/******************************************************************************
 *
 *  Copyright (C) 2008 Boris Iven, Max Hermann
 *
 *  This file is part of the "CEDRIC Event Display" application.
 *
 *****************************************************************************/

#ifndef CREATEPLANARSHADOWVISITOR_H
#define CREATEPLANARSHADOWVISITOR_H

#include <osg/NodeVisitor>
#include <osg/Group>
#include <osg/Geode>
#include <osg/Geometry>
#include <osg/Billboard>
#include <osg/Transform>
#include <osg/ref_ptr>

#include <stack>

class CreatePlanarShadowVisitor : public osg::NodeVisitor
{
public:
        enum ProjectionPlane { XY_PLANE, XZ_PLANE, YZ_PLANE };

        CreatePlanarShadowVisitor( int       projectionPlane = XZ_PLANE, 
                                   double    distance        = -1.0,
                                                           osg::Vec4 shadowColor     = osg::Vec4(0,0,0,1) );

        virtual void apply( osg::Geode& geode );

        virtual void apply( osg::Billboard& billboard );

        virtual void apply( osg::Transform& transform );

        osg::Node* getShadow() { return _shadowNode.get(); }

protected:
        osg::Geode* buildShadowFromGeometry( osg::Geometry* geom );

private:
        osg::ref_ptr<osg::Group> _shadowNode;

        osg::Vec3 _projectionAxis;
        double    _distance;
        osg::Vec4 _shadowColor;

        std::stack<osg::Matrix> _matrixStack;
};

#endif