private double TestRay(Ray ray, Scene scene)
{
ISect isect = MinIntersection(ray, scene);
if (ISect.IsNull(isect))
{
return(0);
}
return(isect.Dist);
}
private Color TraceRay(Ray ray, Scene scene, int depth)
{
ISect isect = MinIntersection(ray, scene);
if (ISect.IsNull(isect))
{
return(Color.Background);
}
return(Shade(isect, scene, depth));
}
private Color Shade(ISect isect, Scene scene, int depth)
{
Vector d = isect.Ray.Dir;
Vector pos = Vector.Plus(Vector.Times(isect.Dist, isect.Ray.Dir), isect.Ray.Start);
Vector normal = isect.Thing.Normal(pos);
Vector 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, new Color(.5, .5, .5)));
}
return(Color.Plus(ret, GetReflectionColor(isect.Thing, Vector.Plus(pos, Vector.Times(.001, reflectDir)), normal, reflectDir, scene, depth)));
}
private ISect MinIntersection(Ray ray, Scene scene)
{
ISect min = ISect.Null;
foreach (SceneObject obj in scene.Things)
{
ISect isect = obj.Intersect(ray);
if (!ISect.IsNull(isect))
{
if (ISect.IsNull(min) || min.Dist > isect.Dist)
{
min = isect;
}
}
}
return(min);
}
