def test_shading_an_intersection():
w = default_world()
r = Ray(point(0, 0, -5), vector(0, 0, 1))
shape = w[0]
i = Intersection(4, shape)
comps = i.prepare_computations(r)
c = w.shade_hit(comps)
assert(np.allclose(color(0.38066, 0.47583, 0.2855), c, atol=0.0001))
def test_the_color_with_an_intersection_behind_the_ray():
w = default_world()
outer = w[0]
outer._material._ambient = 1
inner = w[1]
inner._material._ambient = 1
r = Ray(point(0, 0, 0.75), vector(0, 0, -1))
c = w.color_at(r)
assert(np.allclose(c, inner.material.color))
def test_shading_an_intersection_from_the_inside():
w = default_world()
w._light = PointLight(point(0, 0.25, 0), color(1, 1, 1))
r = Ray(point(0, 0, 0), vector(0, 0, 1))
shape = w[1]
i = Intersection(0.5, shape)
comps = i.prepare_computations(r)
c = w.shade_hit(comps)
assert(np.allclose(color(0.90498, 0.90498, 0.90498), c))
def test_intersect_a_world_with_a_ray():
w = default_world()
r = Ray(point(0, 0, -5), vector(0, 0, 1))
xs = w.intersect(r)
assert(len(xs) == 4)
assert(xs[0].t == 4)
assert(xs[1].t == 4.5)
assert(xs[2].t == 5.5)
assert(xs[3].t == 6)
def test_rendering_a_world_with_a_camera():
w = default_world()
from_ = point(0, 0, -5)
to = point(0, 0, 0)
up = vector(0, 1, 0)
c = Camera(11, 11, math.pi/2, transform=view_transformation(from_, to, up))
image = c.render(w)
assert(np.allclose(image.pixel_at(5, 5), color(
0.38066, 0.47583, 0.2855), atol=0.00001))
def test_there_is_no_shadow_when_an_object_is_behind_the_light():
w = default_world()
p = point(-20, 20, -20)
assert(w.is_shadowed(p) == False)
def test_the_shadow_when_an_object_is_between_the_point_and_the_light():
w = default_world()
p = point(10, -10, 10)
assert(w.is_shadowed(p))
def test_there_is_no_shadow_when_nothing_is_collinear_with_point_and_light():
w = default_world()
p = point(0, 10, 0)
assert(w.is_shadowed(p) == False)
def test_the_color_when_the_ray_hits():
w = default_world()
r = Ray(point(0, 0, -5), vector(0, 0, 1))
c = w.color_at(r)
assert(np.allclose(color(0.38066, 0.47583, 0.2855), c, atol=0.0001))
def test_the_color_when_the_ray_misses():
w = default_world()
r = Ray(point(0, 0, -5), vector(0, 1, 0))
c = w.color_at(r)
assert(np.allclose(black, c))