PhongReflection.h

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

#ifndef __PHONG_REFLECTION_H
#define __PHONG_REFLECTION_H

#include <gra/reflection/LocalReflection.h>

/*
 * Phong reflection model extends the generic local reflection
 * with a global ambient contribution.
 * It employs either Phong or Blinn BRDF together with Lambertian diffuse BRDF.
 */

using namespace esg;

namespace gra {

class GRA_EXPORT PhongReflection : public LocalReflection {
public:
    enum SpecularEval { PHONG, BLINN };
    
protected:
    Color3f _globalAmbient;

public:
    PhongReflection (Emittance    * e  /* emittance      */ = NULL,
                     SpecularEval   s  /* Diffuse eval.  */ = PHONG,
                     const Color3f& c  /* global ambient */ = Color3f(0,0,0));

    virtual ~PhongReflection ();
    
    virtual void setDiffuseBRDF   (DiffuseBRDF*)  {}
    virtual void setSpecularBRDF  (SpecularBRDF*) {}
    virtual void setGlobalAmbient (const Color3f& c) { _globalAmbient.set(c); }

    /*
     * Required input parametters,
     * viwerDir() and distance() have to be defined together:
     *   PointEnv.intersection()    = point of interest (PoI)
     *   PointEnv.normal()          = surface normal at PoI
     * [ PointEnv.viewerDir()       = normalized direction from PoI to viewer
     *   PointEnv.distance()        = distance between PoI and viewer ]
     */
    virtual Color3f* illuminatePoint(PointEnv   & /* point of interest  */,
                                     MatVisitor & /* intialized visitor */);
};
    
} // namespace

#endif // __PHONG_REFLECTION_H

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