Vector3f shade(const Ray &ray, const Hit &hit, SceneParser * Scene )
{
Material * material=hit.getMaterial();
//need to get a specific diffuse color depending on whether or not we have triangle object
//and whether or not this triangle object contains a texture
//as default set as diffuse color
Vector3f _diffuseColor=material->getDiffuseColor();
Vector2f uv;
Texture * tex;
if(hit.hasTex())
{
if((*material).isLoaded())
cout << "texture should have been loaded" <<endl;
else
cout << "Material is not loaded!" <<endl;
uv=hit.getTexCoord();
tex=(*material).getTexture();
cout << "texture coordinates" << uv[0] << " " << uv[1] <<endl;
_diffuseColor=(*tex).getTexel(uv[0],uv[1]); //set diffuse color based on texture map
}
Vector3f _specularColor=material->getSpecularColor();
float _shininess=material->getShininess();
//first we need to figure out where this section of material is located
Vector3f n=hit.getNormal();
Vector3f dray=ray.getDirection();
Vector3f p=ray.pointAtParameter(hit.getT());
Vector3f c_amb=Scene->getAmbientLight();
int num=Scene->getNumLights();
Vector3f color=_diffuseColor*c_amb; //* is direct vector product
Light * bob;
Vector3f ldir, col,ref;
float dist,val,val2;
//iterate through light sources
for(int i=0; i<num; i++)
{
bob=Scene->getLight(i);
bob->getIllumination(p,ldir,col,dist);
//compute contribution from diffuse reflection
val=ldir.dot(ldir,n);
if(val<0) //clamp value
val=0;
color=color+_diffuseColor*col*val;
//compute contribution from specular reflection
ref=ldir-2*ldir.dot(ldir,n)*n;
val2=pow(dray.dot(dray,ref),_shininess); //as dray moves off reflection we suppress
if(dray.dot(dray,ref)<0) //clamp value
val2=0;
color=color+_specularColor*col*val2;
}
return color;
}
