public void When_intersecting_triangles_preserve_the_u_and_v_values_in_the_resulting_intersection()
{
var ray = new Ray(new Point(-0.2, 0.3, -2), Vector.UnitZ);
var intersections = _triangle.LocalIntersect(ray);
intersections[0].U.Should().BeApproximately(0.45, NumberExtensions.Epsilon);
intersections[0].V.Should().BeApproximately(0.25, NumberExtensions.Epsilon);
}
public void SmoothTriangleIntersection()
{
Ray r = new Ray(Tuple.Point(-0.2, 0.3, -2), Tuple.Vector(0, 0, 1));
List <Intersection> xs = tri.LocalIntersect(r);
Assert.IsTrue(Globals.EqualityOfDouble(xs[0].U, 0.45));
Assert.IsTrue(Globals.EqualityOfDouble(xs[0].V, 0.25));
}
public void An_intersection_with_a_smooth_triangle_stores_u_and_v()
{
var ray = new Ray(Tuple.Point(-0.2, 0.3, -2), Tuple.Vector(0, 0, 1));
var xs = _tri.LocalIntersect(ray);
Assert.AreEqual(1, xs.Count);
xs[0].U.Should().BeApproximately(0.45, C.Epsilon);
xs[0].V.Should().BeApproximately(0.25, C.Epsilon);
}
public void IntersectionWithSmoothTriangle_ShouldStoresUv()
{
var p1 = new Point(0, 1, 0);
var p2 = new Point(-1, 0, 0);
var p3 = new Point(1, 0, 0);
var n1 = new Vector(0, 1, 0);
var n2 = new Vector(-1, 0, 0);
var n3 = new Vector(1, 0, 0);
var tri = new SmoothTriangle(p1, p2, p3, n1, n2, n3);
var r = new Ray(new Point(-0.2, 0.3, -2), new Vector(0, 0, 1));
var xs = tri.LocalIntersect(r);
Assert.Equal(0.45, xs[0].u, 2);
Assert.Equal(0.25, xs[0].v, 2);
}
