public void TestColorWhenRayMisses()
{
var w = new DefaultWorld();
var r = new Ray(Vector4.CreatePosition(0, 0, -5), Vector4.CreateDirection(0, 1, 0));
var c = w.Trace(r, 5);
Assert.Equal(Color.Black, c);
}
public void TestColorWhenRayHits()
{
var w = new DefaultWorld();
var r = new Ray(Vector4.CreatePosition(0, 0, -5), Vector4.CreateDirection(0, 0, 1));
var c = w.Trace(r, 5);
var expected = new Color(0.38066, 0.47583, 0.2855);
const double eps = 0.00001;
var comparer = Color.GetEqualityComparer(eps);
Assert.Equal(expected, c, comparer);
}
public void TestColorWithIntersectionBehindRay()
{
var w = new DefaultWorld();
var outer = w.Objects[0];
outer.Material.Ambient = 1;
var inner = w.Objects[1];
inner.Material.Ambient = 1;
var r = new Ray(Vector4.CreatePosition(0, 0, 0.75), Vector4.CreateDirection(0, 0, -1));
var c = w.Trace(r, 5);
const double eps = 0.00001;
var comparer = Color.GetEqualityComparer(eps);
Assert.Equal(inner.Material.Color, c, comparer);
}