ReflectionModel.h

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/* $Id: ReflectionModel.h,v 1.1 2002/12/05 15:08:03 cvs Exp $ */

#ifndef __REFLECTION_MODEL_H
#define __REFLECTION_MODEL_H

#include <gra/GRAObject.h>
#include <esg/brdf/DiffuseBRDF.h>
#include <esg/brdf/SpecularBRDF.h>
#include <esg/emittance/Emittance.h>
#include <esg/visitor/MatVisitor.h>
#include <esg/Definitions.h>
#include <esg/SceneGraphObject.h>
#include <gra/scene/Scene.h>

/*
 * Generic class for Kajyia's rendering equation estimators.
 *
 * BRDF and Emittance are common for all points of single surface (shape).
 * They are therefore maintained by separate set of methods and they are NOT
 * inspected for individial objects of illuminatePoint() function
 *
 * Protocol:
 *   reflection.setScene(scene);
 *   for each shape in scene {
 *      reflection.setBRDF(brdf);
 *      [ reflection.setEmittance(emittance); ]
 *      for each surface point {
 *         reflection.illuminatePoint(...);
 *      }
 *   }
 */

using namespace esg;

namespace gra {
    
class GRA_EXPORT ReflectionModel : public GRAObject {
protected:
    DiffuseBRDF  * _pDiffuseBRDF;
    SpecularBRDF * _pSpecularBRDF;
    Emittance    * _pEmittance;
    Scene        * _pScene;

public:
    ReflectionModel (DiffuseBRDF  * db = NULL,
                     SpecularBRDF * sb = NULL,
                     Emittance    *  e = NULL)
        : _pDiffuseBRDF(db),
          _pSpecularBRDF(sb),
          _pEmittance(e),
          _pScene(NULL) {}
    
    virtual ~ReflectionModel () {}

    virtual void setDiffuseBRDF  (DiffuseBRDF  * b) { _pDiffuseBRDF  = b; }
    virtual void setSpecularBRDF (SpecularBRDF * b) { _pSpecularBRDF = b; }
    virtual void setEmittance    (Emittance    * e) { _pEmittance    = e; }
    virtual void setScene        (Scene        * s) { _pScene        = s; }

    virtual Color3f* illuminatePoint(PointEnv& /* point of interest  */) = 0;
};
    
} // namespace

#endif // __REFLECTION_MODEL_H

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