def test_color_at_with_mutually_reflective_surfaces(self):
w = World()
w.light_source = PointLight(Point(0, 0, 0), Color.white())
lower = Plane()
lower.material.reflective = 1
lower.transformation = translation(0, -1, 0)
upper = Plane()
upper.material.reflective = 1
upper.transformation = translation(0, 1, 0)
w.add(lower, upper)
r = Ray(Point(0, 0, 0), Vector(0, 1, 0))
# Avoid Infinite Recursion
w.color_at(r)
assert True
def test_reflected_color_at_max_recursive_depth(self, default_world):
w = default_world
shape = Plane()
shape.material.reflective = 0.5
shape.transformation = translation(0, -1, 0)
w.add(shape)
r = Ray(Point(0, 0, -3), Vector(0, -sqrt(2) / 2, sqrt(2) / 2))
i = Intersection(sqrt(2), shape)
comps = i.prepare_computations(r)
color = w.reflected_color(comps, 0)
assert color == Color.black()
def test_shade_hit_with_reflective_material(self, default_world):
w = default_world
shape = Plane()
shape.material.reflective = 0.5
shape.transformation = translation(0, -1, 0)
w.add(shape)
r = Ray(Point(0, 0, -3), Vector(0, -sqrt(2) / 2, sqrt(2) / 2))
i = Intersection(sqrt(2), shape)
comps = i.prepare_computations(r)
color = w.shade_hit(comps)
assert color == Color(0.87676, 0.92434, 0.82917)
def test_reflected_color_for_reflective_material(self, default_world):
w = default_world
shape = Plane()
shape.material.reflective = 0.5
shape.transformation = translation(0, -1, 0)
w.add(shape)
r = Ray(Point(0, 0, -3), Vector(0, -sqrt(2) / 2, sqrt(2) / 2))
i = Intersection(sqrt(2), shape)
comps = i.prepare_computations(r)
color = w.reflected_color(comps)
assert color == Color(0.19033, 0.23791, 0.14274)
def test_shade_hit_with_transparent_material(self, default_world):
w = default_world
floor = Plane()
floor.transformation = translation(0, -1, 0)
floor.material.transparency = 0.5
floor.material.refractive_index = 1.5
ball = Sphere()
ball.material.color = Color(1, 0, 0)
ball.material.ambient = 0.5
ball.transformation = translation(0, -3.5, -0.5)
w.add(floor, ball)
r = Ray(Point(0, 0, -3), Vector(0, -sqrt(2) / 2, sqrt(2) / 2))
xs = Intersections(Intersection(sqrt(2), floor))
comps = xs[0].prepare_computations(r, xs)
color = w.shade_hit(comps, 5)
assert color == Color(0.93642, 0.68642, 0.68642)
floor.material.refractive_index = 1.333
under = Sphere()
under.transformation = translation(0, -.5, 0) * scaling(.25, .25, .25)
under.material.color = Color(0, .8, 0)
under.material.refractive_index = 1.5
under.material.ambient = .8
above = Sphere()
above.transformation = translation(1, .5, 0) * scaling(.5, .5, .5)
above.material.color = Color(.2, 0, 0)
above.material.diffuse = .8
above.material.ambient = .5
bottom = Plane()
bottom.transformation = translation(0, -1.25, 0)
bottom.material.pattern = StripePattern(Color.black(), Color(0, .2, .2))
bottom.material.diffuse = .25
bottom.material.ambient = .25
world = World()
world.add(floor, under, above, bottom)
world.light_source = PointLight(Point(-10, 10, -10), Color.white())
camera = Camera(300, 200, pi / 3)
camera.transformation = view_transform(Point(0, 1.5, -5), Point(0, 1, 0), Vector(0, 1, 0))
canvas = camera.render(world)
write_ppm_to_file(canvas.to_ppm(), f'..{sep}..{sep}resources{sep}reflect_refract.ppm')