PathTracing.h

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/* $Id:$ */

#ifndef __PATH_TRACING_H
#define __PATH_TRACING_H

#include <gra/reflection/RayTracing.h>
#include <esg/visitor/MatVisitor.h>

/*
 * Global reflection model solving the rendering equation employing
 * the Monte-Carlo ray tracing.
 *
 * Default medium refraction is refraction of surrounding environment.
 * This is the refraction of air by default (RERF_AIR) but arbitrary value can
 * be used, e.g. refraction of water for underwater scenes (REFR_WATER_20C).
 */

using namespace esg;

namespace gra {

class GRA_EXPORT PathTracing : public RayTracing {
protected:
    unsigned _photonsPerSurface;
    
protected:
    virtual void _cast_the_ray (PointEnv&, unsigned, bool, Color3f&,
                                const Vector3&, const Vector3&);
    
    virtual void _cast_secondary_rays (PointEnv&, unsigned, bool, Color3f&,
                                       MatVisitor&);

public:
    PathTracing (AutoPtr<LocalReflection> * r = NULL,
                 const Color3f            & bg= Color3f(0,0,0),/*Background  */
                 Intersector              * i = NULL,
                 unsigned                   d = 1,  /*Max depth of recursion */
                 float                      w = .001,/*Minimal weight of rays*/
                 float                      f = REFR_AIR,/*default refraction*/
                 unsigned                   p = 1 /* photons per surface */)
        : RayTracing(r, bg, i, d, w, f), _photonsPerSurface(p) {}
};

} // namespace

#endif // __PATH_TRACING_H

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