/**
* Shades a point with the same algorithm used by the {@link <a
* href="http://surf.sourceforge.net">surf raytracer</a>}.
*
* @param hitPoint Intersection point.
* @param v View vector (from intersection point to eye).
* @param n Surface normal.
* @param material Surface material.
* @return
*/
protected Color3f shadeWithMaterial(
Point3d hitPoint,
Vector3d v,
Vector3d n,
Color3f ambientColor,
LightProducts[] lightProducts) {
Vector3d l = new Vector3d();
Vector3d h = new Vector3d();
Color3f color = new Color3f(ambientColor);
for (int i = 0; i < dcsd.lightSources.length; i++) {
LightSource lightSource = dcsd.lightSources[i];
l.sub(lightSource.getPosition(), hitPoint);
l.normalize();
float lambertTerm = (float) n.dot(l);
if (lambertTerm > 0.0f) {
// compute diffuse color component
color.scaleAdd(lambertTerm, lightProducts[i].getDiffuseProduct(), color);
// compute specular color component
h.add(l, v);
h.normalize();
color.scaleAdd(
(float)
Math.pow(Math.max(0.0f, n.dot(h)), lightProducts[i].getMaterial().getShininess()),
lightProducts[i].getSpecularProduct(),
color);
}
}
color.clampMax(1.0f);
return color;
}