DtOsgCullVisitor.h

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/******************************************************************************
** Copyright (c) 2012 MAK Technologies, Inc.
** All rights reserved.
******************************************************************************/


#pragma once

#include <vrvOsg/vrvOsg.h>
#include <vrvOsg/DtOsgCullVisitorParameters.h>
#include <osgUtil/CullVisitor>

namespace makVrv
{
   class DT_DLL_VRVOSG DtOsgCullVisitor : public osgUtil::CullVisitor
   {
   public:
      DtOsgCullVisitor();

      DtOsgCullVisitor(const DtOsgCullVisitor&);

      void initializeViewDependentSettings();

      bool orthoCulling() const;

      bool coordinateSystemChanged() const;

      virtual float getDistanceToScreenEdge(const osg::Vec3& vec) const;

      virtual float altitude2D() const;

      const DtOsgCullVisitorParameters* visitorParameters() const;

   protected:

      virtual void apply(osg::Transform& node);
      
      virtual void apply(osg::Group& group);

      virtual float getDistanceToViewPoint(const osg::Vec3& vec, bool useLOD) const;

      virtual bool isCulled( osg::Node& node, double scaleFactor ) ;
     
      DtOsgCullVisitorParameters* getVisitorParameters() const;
      
      virtual osgUtil::CullVisitor* clone() const;     

   protected:
      DtOsgCullVisitorParameters* myInfoCopy;
      double myAltitude;
      double myMaximumMagnificationAngle;
      osg::Matrix myWorldToWindowMatrix;
   };
}