public void RefractedColorWithRefractedRay()
{
var w = new DefaultWorld();
var a = w.Objects[0];
a.Material.Ambient = 1.0;
a.Material.Pattern = new TestPattern();
var b = w.Objects[1];
b.Material.Transparency = 1.0;
b.Material.RefractiveIndex = 1.5;
var r = new Ray(
Vector4.CreatePosition(0, 0, 0.1),
Vector4.CreateDirection(0, 1, 0));
var xs = IntersectionList.Create(
new Intersection(-0.9899, a),
new Intersection(-0.4899, b),
new Intersection(0.4899, b),
new Intersection(0.9899, a));
var comps = xs[2].Precompute(r, xs);
var c = w.GetRefractedColor(comps, 5);
var expected = new Color(0, 0.99888, 0.04725);
const double eps = 0.0001;
var comparer = Color.GetEqualityComparer(eps);
Assert.Equal(expected, c, comparer);
}
public void RefractedColorWithOpaqueSurface()
{
var w = new DefaultWorld();
var shape = w.Objects[0];
var r = new Ray(Vector4.CreatePosition(0, 0, -5), Vector4.CreateDirection(0, 0, 1));
var xs = IntersectionList.Create(
new Intersection(4, shape),
new Intersection(6, shape));
var comps = xs[0].Precompute(r, xs);
var c = w.GetRefractedColor(comps, 5);
Assert.Equal(Color.Black, c);
}
public void RefractedColorUnderTotalInternalReflection()
{
var w = new DefaultWorld();
var shape = w.Objects[0];
shape.Material.Transparency = 1.0;
shape.Material.RefractiveIndex = 1.5;
var r = new Ray(
Vector4.CreatePosition(0, 0, Math.Sqrt(2) / 2),
Vector4.CreateDirection(0, 1, 0));
var xs = IntersectionList.Create(
new Intersection(-Math.Sqrt(2) / 2, shape),
new Intersection(Math.Sqrt(2) / 2, shape));
var comps = xs[1].Precompute(r, xs);
var c = w.GetRefractedColor(comps, 5);
Assert.Equal(Color.Black, c);
}
public void RefractedColorAtMaxRecursiveDepth()
{
var w = new DefaultWorld();
var shape = w.Objects[0];
shape.Material.Transparency = 1.0;
shape.Material.RefractiveIndex = 1.5;
var r = new Ray(
Vector4.CreatePosition(0, 0, -5),
Vector4.CreateDirection(0, 0, 1));
var xs = IntersectionList.Create(
new Intersection(4, shape),
new Intersection(6, shape));
var comps = xs[0].Precompute(r, xs);
var c = w.GetRefractedColor(comps, 0);
Assert.Equal(Color.Black, c);
}