def test_intersection__sphere_center_elsewhere__given_ray_that_intersects_at_no_points__return_true(
):
assert (intersection(Ray((-2, 1.5, 0), (1, 0, 0)), Sphere((1, 1, 1),
1.0)) == None)
def test_intersection__sphere_center_elsewhere__given_ray_that_originates_inside_sphere__return_true(
):
assert (intersection(Ray((1, 1, 1), (0, 0, 1)), Sphere(
(1, 1, 1), 1.0)) == Point([1, 1, 2]))
def test_intersection__sphere_center_elsewhere__given_ray_that_intersects_at_two_points__return_true(
):
assert array_equal(
intersection(Ray((-2, 1, 1), (1, 0, 0)), Sphere((1, 1, 1), 1.0)),
[Point([0, 1, 1]), Point([2, 1, 1])]) is True
def test_intersection__sphere_center_elsewhere__given_tangent_ray__return_true(
):
assert (intersection(Ray((-3, 1, 0), (1, 0, 0)), Sphere(
(1, 1, 1), 1.0)) == Point([1, 1, 0]))
def test_intersection__sphere_center_at_origin__given_ray_that_originates_inside_sphere__return_true(
):
assert (intersection(Ray((-0.5, 0, 0), (1, 0, 0)), Sphere(
(0, 0, 0), 1.0)) == Point([1, 0, 0]))
def test_intersection__sphere_center_at_origin__given_ray_that_intersects_at_two_points__return_true(
):
assert array_equal(
intersection(Ray((-2, 0, 0), (1, 0, 0)), Sphere((0, 0, 0), 1.0)),
[Point([-1, 0, 0]), Point([1, 0, 0])]) is True
def test_intersection__sphere_center_at_origin__given_tangent_ray__return_true(
):
assert (intersection(Ray((-3, 1, 0), (1, 0, 0)), Sphere(
(0, 0, 0), 1.0)) == Point([0, 1, 0]))
