@Override
public Spectrum shade(HitRecord hit, Light light) {
Spectrum spectrum = new Spectrum(0.f, 0.f, 0.f);
Vector3f hitPoint = hit.getIntersectionPoint();
Vector3f normal = hit.getNormal();
normal.normalize();
Spectrum cl = light.getCl(hitPoint);
Vector3f L = light.getL(hitPoint);
Vector3f rayDir = hit.getRayDir();
rayDir.normalize();
// Diffuse reflectance term
float nDotL = normal.dot(L);
if (nDotL >= 0) {
spectrum.append(cl.multipliedBy(diffuse).multipliedBy(nDotL));
// Specular reflectance term
Vector3f h = new Vector3f(L);
h.sub(rayDir);
h.normalize();
float hDotN = (float) Math.pow(h.dot(normal), shininess);
spectrum.append(specular.multipliedBy(cl).multipliedBy(hDotN));
}
// Ambient reflectance term
cl = light.getCl(hitPoint);
Spectrum amb = ambient.multipliedBy(cl);
spectrum.append(amb);
spectrum.clampMax(1.f);
spectrum.clampMin(0.f);
return spectrum;
}
