private static void TestCase02()
{
// The Schlick approximation with a perpendicular viewing angle
Shape shape = new GlassSphere();
Ray r = new Ray(Tuple.Point(0, 0, 0), Tuple.Vector(0, 1, 0));
List <Intersection> xs = Intersection.Aggregate(new Intersection(-1, shape), new Intersection(1, shape));
Computation comps = new Computation(xs[1], r, xs);
float reflectance = Fresnel.Schlick(comps);
Assert.Equal(0.04f, reflectance, 5);
}
private static void TestCase03()
{
// The Schlick approximation with small angle and n2 > n1
Shape shape = new GlassSphere();
Ray r = new Ray(Tuple.Point(0, 0.99f, -2), Tuple.Vector(0, 0, 1));
List <Intersection> xs = Intersection.Aggregate(new Intersection(1.8589f, shape));
Computation comps = new Computation(xs[0], r, xs);
float reflectance = Fresnel.Schlick(comps);
Assert.Equal(0.48873f, reflectance, 5);
}
private static void TestCase01()
{
// The Schlick approximation under total internal reflection
Shape shape = new GlassSphere();
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);
float reflectance = Fresnel.Schlick(comps);
Assert.Equal(1, reflectance);
}
