RGBColor Matte::shade(Hit& h){
msgfx::Vector3f wo = -h.ray.Direction();
RGBColor L = _ambientBRDF->rho(h, wo) * h.scenePtr->ambientLight;
int numLights = h.scenePtr->myNumberOfLights;
msgfx::Vector3f wi;
for(int i = 0; i < numLights; ++i)
{
wi = h.scenePtr->myLights[i]->Position() - h.Position();
float d = wi.length();
wi.normalize();
float ndotwi = h.normal.dot(wi);
if(ndotwi > 0.0){
// Calculate attenuation factor
if(h.scenePtr->isPointVisibleToLight(h.Position(), h.scenePtr->myLights[i]))
{
float attenuation = 1 / (d*d*h.scenePtr->myLights[i]->Attenuation().r + d*h.scenePtr->myLights[i]->Attenuation().g + h.scenePtr->myLights[i]->Attenuation().b);
L = L + _diffuseBRDF->f(h, wo, wi) * h.scenePtr->myLights[i]->Color() * ndotwi * attenuation;
}
}
}
return L;
}
