private static void TestCase05()
{
// The refracted color with an opaque surface
World w = new DefaultWorld();
Shape shape = w.Shapes[0];
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
List <Intersection> xs = Intersection.Aggregate(new Intersection(4, shape), new Intersection(6, shape));
Computation comps = new Computation(xs[0], r, xs);
LightingModel l = new PhongReflection();
Tuple c = l.RefractedColor(w, comps, 5);
Assert.Equal(Tuple.Color(0, 0, 0), c);
}
private static void TestCase07()
{
// The refracted color under total internal reflection
World w = new DefaultWorld();
Shape shape = w.Shapes[0];
shape.Material.Transparency = 1;
shape.Material.RefractiveIndex = 1.5f;
Ray r = new Ray(Tuple.Point(0, 0, Sqrt(2) / 2), Tuple.Vector(0, 1, 0));
List <Intersection> xs = Intersection.Aggregate(new Intersection(-Sqrt(2) / 2, shape), new Intersection(Sqrt(2) / 2, shape));
Computation comps = new Computation(xs[1], r, xs);
LightingModel l = new PhongReflection();
Tuple c = l.RefractedColor(w, comps, 5);
Assert.Equal(Tuple.Color(0, 0, 0), c);
}
private static void TestCase06()
{
// The refracted color at the maximum recursive depth
World w = new DefaultWorld();
Shape shape = w.Shapes[0];
shape.Material.Transparency = 1;
shape.Material.RefractiveIndex = 1.5f;
Ray r = new Ray(Tuple.Point(0, 0, -5), Tuple.Vector(0, 0, 1));
List <Intersection> xs = Intersection.Aggregate(new Intersection(4, shape), new Intersection(6, shape));
Computation comps = new Computation(xs[0], r, xs);
LightingModel l = new PhongReflection();
Tuple c = l.RefractedColor(w, comps, 0);
Assert.Equal(Tuple.Color(0, 0, 0), c);
}
private static void TestCase08()
{
// The refracted color with a refracted ray
World w = new DefaultWorld();
Shape A = w.Shapes[0];
A.Material.Ambient = 1;
A.Material.Pattern = new PositionPattern();
Shape B = w.Shapes[1];
B.Material.Transparency = 1;
B.Material.RefractiveIndex = 1.5f;
Ray r = new Ray(Tuple.Point(0, 0, 0.1f), Tuple.Vector(0, 1, 0));
List <Intersection> xs = Intersection.Aggregate(new Intersection(-0.9899f, A),
new Intersection(-0.4899f, B),
new Intersection(0.4899f, B),
new Intersection(0.9899f, A));
Computation comps = new Computation(xs[2], r, xs);
LightingModel l = new PhongReflection();
Tuple c = l.RefractedColor(w, comps, 5);
Assert.Equal(Tuple.Color(0, 0.99888f, 0.04725f), c);
}
