def test_intersect_cone_with_ray_parallel_to_half(self):
shape = Cone()
direction = Vector.normalize(Vector(0, 1, 1))
r = Ray(Point(0, 0, -1), direction)
xs = shape.local_intersect(r)
self.assertEqual(len(xs), 1)
self.assertAlmostEqual(xs[0].t, 0.35355, delta=Constants.epsilon)
def test_intersect_cone_end_cap(self):
shape = Cone()
shape.minimum = -0.5
shape.maximum = 0.5
shape.closed = True
RayIntersection = namedtuple("RayIntersection",
["origin", "direction", "count"])
ray_intersections = [
RayIntersection(Point(0, 0, -5), Vector(0, 1, 0), 0),
RayIntersection(Point(0, 0, -0.25), Vector(0, 1, 1), 2),
RayIntersection(Point(0, 0, -0.25), Vector(0, 1, 0), 4)
]
for ray_intersection in ray_intersections:
direction = Vector.normalize(ray_intersection.direction)
r = Ray(ray_intersection.origin, direction)
xs = shape.local_intersect(r)
self.assertEqual(len(xs), ray_intersection.count)
def test_intersect_cone_with_ray(self):
shape = Cone()
RayIntersection = namedtuple("RayIntersection",
["origin", "direction", "t0", "t1"])
ray_intersections = [
RayIntersection(Point(0, 0, -5), Vector(0, 0, 1), 5, 5),
RayIntersection(Point(0, 0, -5), Vector(1, 1, 1), 8.66025,
8.66025),
RayIntersection(Point(1, 1, -5), Vector(-0.5, -1, 1), 4.55006,
49.44994)
]
for ray_intersection in ray_intersections:
direction = Vector.normalize(ray_intersection.direction)
r = Ray(ray_intersection.origin, direction)
xs = shape.local_intersect(r)
self.assertEqual(len(xs), 2)
self.assertAlmostEqual(xs[0].t,
ray_intersection.t0,
delta=Constants.epsilon)
self.assertAlmostEqual(xs[1].t,
ray_intersection.t1,
delta=Constants.epsilon)