public void Triangle_IntersectDistance_ray_intersecting_p3_gives_correct_distance()
{
Ray ray = new Ray(new Point(1.0f, 1.0f, -10.0f), new Vector(0.0f, 0.0f, 1.0f));
var p1 = new Point(0.0f, 0.0f, 0.0f);
var p2 = new Point(1.0f, 0.0f, 0.0f);
var p3 = new Point(1.0f, 1.0f, 0.0f);
var t = new Triangle(p1, p2, p3);
var distance = t.IntersectDistance(ray);
Assert.AreEqual(10.0f, distance, EPSILON);
}
public void Triangle_IntersectDistance_throws_given_null_ray()
{
Ray ray = null;
var p1 = new Point(0.0f, 0.0f, 0.0f);
var p2 = new Point(1.0f, 0.0f, 0.0f);
var p3 = new Point(1.0f, 1.0f, 0.0f);
var t = new Triangle(p1, p2, p3);
t.IntersectDistance(ray);
}
public void Triangle_IntersectDistance_negative_value_given_orthogonal_ray()
{
Ray ray = new Ray(new Point(0.0f, 0.0f, -10.0f), new Vector(1.0f, 0.0f, 0.0f));
var p1 = new Point(0.0f, 0.0f, 0.0f);
var p2 = new Point(1.0f, 0.0f, 0.0f);
var p3 = new Point(1.0f, 1.0f, 0.0f);
var t = new Triangle(p1, p2, p3);
var distance = t.IntersectDistance(ray);
Assert.IsTrue(distance < 0.0f);
}
