PhongReflection.cc

Go to the documentation of this file.

#include <gra/reflection/PhongReflection.h>
#include <gra/reflection/LocalReflection.h>
#include <esg/brdf/PhongBRDF.h>
#include <esg/brdf/BlinnBRDF.h>
#include <esg/brdf/LambertianBRDF.h>
#include <esg/SceneGraphObject.h>

using namespace gra;

PhongReflection::PhongReflection(Emittance     * e,
                                 SpecularEval    s,
                                 const Color3f&  c)
    : LocalReflection(NULL, NULL, e), _globalAmbient(c)
{
    switch (s) {
    case PHONG:
        _pDiffuseBRDF  = new LambertianBRDF();
        _pSpecularBRDF = new PhongBRDF();
        break;
    case BLINN:
        _pDiffuseBRDF  = new LambertianBRDF();
        _pSpecularBRDF = new BlinnBRDF();
        break;
    default:
        fprintf(stderr,"PhongReflection: Uknown BRDF, using Phong + Lambert\n");
        _pDiffuseBRDF  = new LambertianBRDF();
        _pSpecularBRDF = new PhongBRDF();
    }
}

PhongReflection::~PhongReflection()
{
    if (_pSpecularBRDF) delete _pSpecularBRDF;
    if (_pDiffuseBRDF)  delete _pDiffuseBRDF;
}

Color3f* PhongReflection::illuminatePoint(PointEnv & env, MatVisitor& visitor)
{
    // compute light contributions except the global ambient
    Color3f* pColor = LocalReflection::illuminatePoint(env,visitor);
    
    // append the global ambient contribution
    Vector3 aux(visitor.ambient());
    aux.x *= _globalAmbient.x;
    aux.y *= _globalAmbient.y;
    aux.z *= _globalAmbient.z;
    if (pColor) pColor->add(aux);
    else pColor = new Color3f(aux);

    return pColor;    
}

---