ExternalHeightField3d.h

//
// ExternalHeightField3d.h
//
// Copyright (c) 2010-2011 Virtual Terrain Project
// Free for all uses, see license.txt for details.
//

#pragma once

#include "vtdata/HeightField.h"
#include <osg/Node>
#ifdef USE_OSGEARTH
#include <osgEarthUtil/ElevationManager>
#endif

class vtGeode;
class vtProjection;
namespace osgTerrain
{
    class Layer;
};
namespace osgSim
{
    class HeightAboveTerrain;
};

class vtExternalHeightField3d : public vtHeightField3d, public osg::Referenced
{
public:
    vtExternalHeightField3d(void);
    ~vtExternalHeightField3d(void);

    bool Initialize(const char *external_data);
    osg::Node *CreateGeometry();

    vtProjection &GetProjection();
    const vtProjection &GetProjection() const;

    bool FindAltitudeOnEarth(const DPoint2 &p, float &fAltitude, bool bTrue = false) const;
    bool FindAltitudeAtPoint(const FPoint3 &p3, float &fAltitude, bool bTrue = false, int iCultureFlags = 0, FPoint3 *vNormal = NULL) const;
    bool CastRayToSurface(const FPoint3 &point, const FPoint3 &dir, FPoint3 &result) const;

private:
    osg::ref_ptr<osg::Node> m_pNode;
    osg::PagedLOD           *m_pLOD;
    osgTerrain::Layer       *m_pLayer;
    vtProjection            m_Projection;
    osg::Matrix             m_TransfromOSGModel2VTPWorld;
    osg::Matrix             m_TransformVTPWorld2OSGModel;
    osgSim::HeightAboveTerrain *m_pHat;
    bool                    m_bOsgEarth;

#ifdef USE_OSGEARTH
    osg::ref_ptr<osgEarth::Util::ElevationManager> m_pElevationManager;
    float                   m_ResolutionAtLevel0;
    float                   m_CompromiseResolution;
#endif
};