def test_schlick_perpendicular():
s = GlassSphere()
r = Ray(Point(0, 0, 0), Vector(0, 1, 0))
xs = Intersections(Intersection(-1, s), Intersection(1, s))
comps = xs[1].prepare_computation(r, xs)
reflectance = comps.schlick()
assert equal(reflectance, 0.04)
def test_schlick_small_angle():
s = GlassSphere()
r = Ray(Point(0, 0.99, -2), Vector(0, 0, 1))
xs = Intersections(Intersection(1.8589, s))
comps = xs[0].prepare_computation(r, xs)
reflectance = comps.schlick()
assert equal(reflectance, 0.48873)
def test_cone_parallel_ray():
s = Cone()
direction = Vector(0, 1, 1).normalize()
r = Ray(Point(0, 0, -1), direction)
xs = s.local_intersect(r)
assert len(xs) == 1
assert equal(xs[0].t, 0.35355)
def test_ray_hit_3():
t0, t1 = ray_hit_helper(Point(0.5, 0, -5), Vector(0.1, 1, 1))
assert equal(6.80798, t0)
assert equal(7.08872, t1)
def test_cone_ray_3():
t0, t1 = cone_ray_helper(Point(1, 1, -5), Vector(-0.5, -1, 1))
assert equal(t0, 4.55006)
assert equal(t1, 49.44994)
def test_cone_ray_2():
t0, t1 = cone_ray_helper(Point(0, 0, -5), Vector(1, 1, 1))
assert equal(t0, 8.66025)
assert equal(t1, 8.66025)
def test_v_pixel_size():
c = Camera(125, 200, math.pi / 2)
assert equal(c.pixel_size, 0.01)
def test_h_pixel_size():
c = Camera(200, 125, math.pi / 2)
assert equal(c.pixel_size, 0.01)