private static void TestCase03()
{
// An intersection can encapsulate 'u' and 'v'
Shape s = new Triangle(Tuple.Point(0, 1, 0), Tuple.Point(-1, 0, 0), Tuple.Point(1, 0, 0));
Intersection i = new IntersectionWithUV(3.5f, s, 0.2f, 0.4f);
Assert.Equal(0.2f, i.U);
Assert.Equal(0.4f, i.V);
}
private static void TestCase05()
{
// A smooth triangle uses u/v to interpolate the normal
Shape tri = ConstructSmoothTriangle();
Intersection i = new IntersectionWithUV(1, tri, 0.45f, 0.25f);
Tuple n = tri.NormalAt(Tuple.Point(0, 0, 0), i);
Assert.Equal(Tuple.Vector(-0.5547f, 0.83205f, 0), n);
}
private static void TestCase06()
{
// Preparing the normal on smooth triangle
Shape tri = ConstructSmoothTriangle();
Intersection i = new IntersectionWithUV(1, tri, 0.45f, 0.25f);
Ray r = new Ray(Tuple.Point(-0.2f, 0.3f, -2), Tuple.Vector(0, 0, 1));
List <Intersection> xs = tri.Intersect(r);
Computation comps = new Computation(i, r, xs);
Assert.Equal(comps.Normalv, Tuple.Vector(-0.5547f, 0.83205f, 0));
}
