def test_translated_shape_intersection():
r = Ray(Point(0, 0, -5), Vector(0, 0, 1))
s = _TestShape()
s.set_transform(Translation(5, 0, 0))
_ = s.intersect(r)
assert s.saved_ray.origin == Point(-5, 0, -5)
assert s.saved_ray.direction == Vector(0, 0, 1)
def test_scaled_shape_intersection():
r = Ray(Point(0, 0, -5), Vector(0, 0, 1))
s = _TestShape()
s.set_transform(Scaling(2, 2, 2))
_ = s.intersect(r)
assert s.saved_ray.origin == Point(0, 0, -2.5)
assert s.saved_ray.direction == Vector(0, 0, 0.5)
def test_add_child():
g = Group()
s = _TestShape()
g.add_child(s)
assert len(g.objects) > 0
assert s.parent == g
def test_shape_has_parent():
s = _TestShape()
assert s.parent is None
def test_transformed_shape_normal():
s = _TestShape()
t = Scaling(1, 0.5, 1) * RotationZ(math.pi / 5)
s.set_transform(t)
n = s.normal_at(Point(0, math.sqrt(2) / 2, -math.sqrt(2) / 2))
assert n == Vector(0, 0.97014, -0.24254)
def test_translated_shape_normal():
s = _TestShape()
s.set_transform(Translation(0, 1, 0))
n = s.normal_at(Point(0, 1.70711, -0.70711))
assert n == Vector(0, 0.70711, -0.70711)
def test_assign_material():
s = _TestShape()
m = Material()
m.ambient = 1
s.set_material(m)
assert s.material == m
def test_default_material():
s = _TestShape()
assert s.material == Material()
def test_assign_transform():
s = _TestShape()
s.set_transform(Translation(2, 3, 4))
assert s.transform == Translation(2, 3, 4)
def test_default_transform():
s = _TestShape()
assert s.transform == Identity()