public void AnIntersectionWithSmoothTriangleStoresUvTest() { var r = Helper.Ray(-0.2, 0.3, -2, 0, 0, 1); var xs = tri.IntersectLocal(r); Check.That(xs[0].U).IsCloseTo(0.45, Helper.Epsilon); Check.That(xs[0].V).IsCloseTo(0.25, Helper.Epsilon); }