private Color TraceRay(Ray ray, Scene scene, int depth)
{
ISect isect = IntersectRay(ray, scene);
if (isect == null)
{
return(Color.Background);
}
return(Shade(isect, scene, depth));
}
private double TestRay(Ray ray, Scene scene)
{
ISect isect = IntersectRay(ray, scene);
if (isect == null)
{
return(0);
}
return(isect.Dist);
}
private Color Shade(ISect isect, Scene scene, int depth)
{
var d = isect.Ray.Dir;
var pos = Vector.Plus(Vector.Times(isect.Dist, isect.Ray.Dir), isect.Ray.Start);
var normal = isect.Thing.Normal(pos);
var reflectDir = Vector.Minus(d, Vector.Times(2 * Vector.Dot(normal, d), normal));
Color ret = Color.DefaultColor;
ret = Color.Plus(ret, GetNaturalColor(isect.Thing, pos, normal, reflectDir, scene));
if (depth >= MaxDepth)
{
return(Color.Plus(ret, Color.Make(.5, .5, .5)));
}
return(Color.Plus(ret, GetReflectionColor(isect.Thing, Vector.Plus(pos, Vector.Times(.001, reflectDir)), normal, reflectDir, scene, depth)));
}
private ISect IntersectRay(Ray ray, Scene scene)
{
ISect best = null;
foreach (SceneObject obj in scene.Things)
{
ISect isect = obj.Intersect(ray);
if (isect != null)
{
if (best == null || isect.Dist < best.Dist)
{
best = isect;
}
}
}
return(best);
}