def test_a_helper_for_producing_a_sphere_with_a_glassy_material():
# Given
s = glass_sphere()
# Then
assert s.transform == identity_matrix()
assert s.material.transparency == 1.0
assert s.material.refractive_index == 1.5
def __init__(self, hsize, vsize, field_of_view):
self.hsize = hsize
self.vsize = vsize
self.field_of_view = field_of_view
self.transform = identity_matrix()
self._calc_pixel_size()
def test_multiplying_a_matrix_by_the_identity_matrix():
# Given
A = Matrix(0, 1, 2, 4,
1, 2, 4, 8,
2, 4, 8, 16,
4, 8, 16, 32)
# Then
assert A * identity_matrix() == A
def test_the_transformation_matrix_for_the_default_orientation():
# Given
f = Point(0, 0, 0) # from
to = Point(0, 0, -1)
up = Vector(0, 1, 0)
# When
t = view_transform(f, to, up)
# Then
assert t == identity_matrix()
def test_constructing_a_camera():
# Given
hsize = 160
vsize = 120
field_of_view = pi / 2
# When
c = Camera(hsize, vsize, field_of_view)
# Then
assert c.hsize == 160
assert c.vsize == 120
assert c.field_of_view == pi / 2
assert c.transform == identity_matrix()
def test_the_default_pattern_transformation():
# Given
pattern = MockPattern()
# Then
assert pattern.transform == identity_matrix()
def __init__(self):
super().__init__()
self.transform = identity_matrix()
self.children = []
def __init__(self):
self.transform = identity_matrix()
self.material = Material()
self.parent = None
def test_creating_a_new_group():
# Given
g = Group()
# Then
assert g.transform == identity_matrix()
assert len(g) == 0
def test_the_default_transformation():
# Given
s = MockShape()
# Then
assert s.transform == identity_matrix()
def test_transposing_the_identity_matrix():
# Given
A = identity_matrix().transpose()
# Then
assert A == identity_matrix()
def test_multiplying_the_identity_matrix_by_a_tuple():
# Given
a = Tuple(1, 2, 3, 4)
# Then
assert identity_matrix() * a == a
def test_multiplying_the_identity_matrix_by_a_matrix():
A = Matrix(0, 1, 2, 4,
1, 2, 4, 8,
2, 4, 8, 16,
4, 8, 16, 32)
assert identity_matrix() * A == A