Color3 LightShadeModel::calcPhongLighting(
Vector3D n, Vector3D v, Vector3D l,
Color3 v_color, Color3 ls_clr,
Material* obj_mat, UINT colorMask){
Color3 totalColor(0, 0, 0);
if (colorMask & MASK_AMBIENT) {
Color3 ac = v_color * ls_clr * obj_mat->ambient;
totalColor += ac;
}
Vector3D r = 2 * (l * n) * n - l;
if (colorMask & MASK_DIFFUSE) {
double diff = l*n;
if (diff < 0) diff = 0;
Color3 dc = diff * v_color * ls_clr * obj_mat->diffuse;
totalColor += dc;
}
if (colorMask & MASK_SPECULAR) {
double spec = r*v;
if (spec < 0) spec = 0;
spec = pow(spec, double(obj_mat->shininess));
Color3 sc = spec * v_color * ls_clr * obj_mat->specular;
totalColor += sc;
}
return totalColor;
}
glm::vec4 BRDF::sampleColor(FastStack<Ray> & rays, const Ray ray, const Intersection & result, Scene * scene) {
glm::vec4 position = result.surface->worldTransform * result.surface->samplePosition(result.index, result.coord);
glm::vec4 normal = glm::normalize(
result.surface->worldTransformIT * result.surface->sampleNormal(result.index, result.coord));
float p = SampleUniform();
glm::vec4 totalColor(0.f, 0.f, 0.f, 0.f);
if (p < emissiveProbability) {
totalColor = emissiveIntensity * emissiveColor / emissiveProbability;
}
else if (ray.depth < maxDepth) {
glm::vec4 strength = ray.strength * diffuseColor;
glm::vec4 outgoing = SampleHemi(normal);
Ray reflected(ray.depth + 1, position, outgoing, strength, PAC_EPSILON);
rays.push(reflected);
}
else {
totalColor.a = 1.f;
}
return totalColor * ray.strength;
}
