PhotonTracing.h

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/* $Id:$ */

#ifndef __PHOTON_TRACING_H
#define __PHOTON_TRACING_H

#include <gra/reflection/PathTracing.h>
#include <esg/energy/PhotonMap.h>
#include <gra/scene/Scene.h>

/*
 * Traces photon from its first point of impact. Energy of photon falled on
 * diffuse surface is stored in the scene for later photon maps creation.
 */

using namespace esg;

namespace gra {

class GRA_EXPORT PhotonTracing : public PathTracing {
protected:
            void _store_photon (PointEnv&, bool);
    virtual void _illuminate   (PointEnv&, unsigned, bool, Color3f&);
    
public:
    PhotonTracing (Intersector * i = NULL,
                   unsigned      d = 1,   /* Max depth of recursion */
                   float         w = .001 /* Minimal photon energy  */)
        : PathTracing(NULL, Color3f(0.,0.,0.), i, d, w, REFR_AIR, 1) {}

    /*
     * Required input parametters:
     *   PointEnv.intersection()    = first impact point of the photon (PoI)
     *   PointEnv.visitableObject() = object with PoI
     *   PointEnv.normal()          = surface normal at PoI
     *   PointEnv.energy()          = power of photon
     *   PointEnv.viewerDir()       = direction to the photon emission location
     *  [PointEnv.trMat             = possible transformation ]
     */
    virtual Color3f* illuminatePoint(PointEnv & /* point of interest */);
};
    
} // namespace

#endif // __PHOTON_TRACING_H

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