private Color shade(Intersection isect, Scene scene, double depth)
{
var d = isect.ray.dir;
var pos = Vector.plus(Vector.times(isect.dist, d), isect.ray.start);
var normal = isect.thing.normal(pos);
var reflectDir = Vector.minus(d, Vector.times(2, Vector.times(Vector.dot(normal, d), normal)));
var naturalColor = Color.plus(Color.background, this.getNaturalColor(isect.thing, pos, normal, reflectDir, scene));
var reflectedColor = (depth >= this.maxDepth) ? Color.grey : this.getReflectionColor(isect.thing, pos, normal, reflectDir, scene, depth);
return(Color.plus(naturalColor, reflectedColor));
}
Vector getPoint(double x, double y, Camera camera)
{
return(Vector.norm(Vector.plus(camera.forward, Vector.plus(Vector.times(recenterX(x), camera.right), Vector.times(recenterY(y), camera.up)))));
}