def test_lighting_with_pattern(self):
m = Material()
m.pattern = Stripe(Color(1, 1, 1), Color(0, 0, 0))
m.ambient = 1
m.diffuse = 0
m.specular = 0
eyev = Vector(0, 0, -1)
normalv = Vector(0, 0, -1)
light = PointLight(Point(0, 0, -10), Color(1, 1, 1))
c1 = PointLight.lighting(m, Sphere(), light, Point(0.9, 0, 0), eyev, normalv, False)
c2 = PointLight.lighting(m, Sphere(), light, Point(1.1, 0, 0), eyev, normalv, False)
self.assertEqual(c1, Color(1, 1, 1))
self.assertEqual(c2, Color(0, 0, 0))
def test_light_eye_reflection(self):
m = Material()
position = Point(0, 0, 0)
eyev = Vector(0, -math.sqrt(2) / 2, -math.sqrt(2) / 2)
normalv = Vector(0, 0, -1)
light = PointLight(Point(0, 10, -10), Color(1, 1, 1))
result = PointLight.lighting(m, Sphere(), light, position, eyev, normalv, False)
self.assertEqual(result, Color(1.6364, 1.6364, 1.6364))
def test_light_behind_surface(self):
m = Material()
position = Point(0, 0, 0)
eyev = Vector(0, 0, -1)
normalv = Vector(0, 0, -1)
light = PointLight(Point(0, 0, 10), Color(1, 1, 1))
result = PointLight.lighting(m, Sphere(), light, position, eyev, normalv, False)
self.assertEqual(result, Color(0.1, 0.1, 0.1))
def test_lighting_surface_in_shadow(self):
m = Material()
position = Point(0, 0, 0)
eyev = Vector(0, 0, -1)
normalv = Vector(0, 0, -1)
light = PointLight(Point(0, 0, -10), Color(1, 1, 1))
in_shadow = True
result = PointLight.lighting(m, Sphere(), light, position, eyev, normalv, in_shadow)
self.assertEqual(result, Color(0.1, 0.1, 0.1))
for x in range(canvas_pixels):
world_x = -half + pixel_size * x
position = Point(world_x, world_y, wall_z)
r = Ray(ray_origin, Vector.normalize(position - ray_origin))
# shrink along y-axis
# r = r.transform(Transformations.scaling(1, 0.5, 1))
# shrink along x-axis
# r = r.transform(Transformations.scaling(0.5, 1, 1))
# shrink and rotate
# r = r.transform(Transformations.rotation_z(math.pi / 4)).transform(Transformations.scaling(0.5, 1, 1))
# shrink and skew
# r = r.transform(Transformations.shearing(1, 0, 0, 0, 0, 0)).transform(Transformations.scaling(0.5, 1, 1))
xs = shape.intersect(r)
hit = Intersection.hit(xs)
if hit is not None:
point = Ray.position(r, hit.t)
normal = shape.normal_at(point)
eye = -r.direction
color = PointLight.lighting(hit.object.material, hit.object,
light, point, eye, normal, False)
canvas.write_pixel(x, y, color)
canvas.canvas_to_ppm()