def test_both_transform():
s = Sphere()
s.set_transform(Scaling(2, 2, 2))
pattern = _TestPattern()
pattern.set_pattern_transform(Translation(0.5, 1, 1.5))
c = pattern.pattern_at_shape(s, Point(2.5, 3, 3.5))
assert c == Color(0.75, 0.5, 0.25)
def test_refracted_color():
w = World().default()
a = w.objects[0]
a.material.ambient = 1.0
a.material.pattern = _TestPattern()
b = w.objects[1]
b.material.transparency = 1.0
b.material.refractive_index = 1.5
r = Ray(Point(0, 0, 0.1), Vector(0, 1, 0))
xs = Intersections(
Intersection(-0.9899, a),
Intersection(-0.4899, b),
Intersection(0.4899, b),
Intersection(0.9899, a),
)
comps = xs[2].prepare_computation(r, xs)
c = w.refracted_color(comps, 5)
print(c)
assert c == Color(0, 0.99888, 0.04725)
def test_pattern_transform():
s = Sphere()
p = _TestPattern()
p.set_pattern_transform(Scaling(2, 2, 2))
c = p.pattern_at_shape(s, Point(2, 3, 4))
assert c == Color(1, 1.5, 2)
def test_object_transform():
s = Sphere()
s.set_transform(Scaling(2, 2, 2))
pattern = _TestPattern()
c = pattern.pattern_at_shape(s, Point(2, 3, 4))
assert c == Color(1, 1.5, 2)
def test_assign_transform():
pattern = _TestPattern()
pattern.set_pattern_transform(Translation(1, 2, 3))
assert pattern.transform == Translation(1, 2, 3)
def test_default_transform():
pattern = _TestPattern()
assert pattern.transform == Identity()