def test_light_directly_behind_surface_and_eye(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 = lighting(m, light, position, eyev, normalv)
self.assertEqual(result, Color(0.1, 0.1, 0.1))
def test_light_and_eye_perpendicular(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 = lighting(m, light, position, eyev, normalv)
self.assertEqual(result, Color(1.9, 1.9, 1.9))
def test_light_perpendicular_and_eye_at_45(self):
r = math.sqrt(2) / 2
m = Material()
position = Point(0, 0, 0)
eyev = Vector(0, r, -r)
normalv = Vector(0, 0, -1)
light = PointLight(Point(0, 0, -10), Color(1, 1, 1))
result = lighting(m, light, position, eyev, normalv)
self.assertEqual(result, Color(1.0, 1.0, 1.0))
def test_light_at_45_and_eye_at_neg_45(self):
r = math.sqrt(2) / 2
m = Material()
position = Point(0, 0, 0)
eyev = Vector(0, -r, -r)
normalv = Vector(0, 0, -1)
light = PointLight(Point(0, 10, -10), Color(1, 1, 1))
result = lighting(m, light, position, eyev, normalv)
x = 1.6363961
self.assertColorEqual(result, Color(x, x, x))
for y in range(H):
p = m * Point(x, y, 0)
ray = Ray(eye, (p - eye).norm())
xs = sphere.intersect(ray)
if xs:
dprint(f"\nSphere hit at {x}, {y}...")
dprint("p: {}".format(p))
dprint("ray: {}".format(ray))
dprint("xs: {}".format(str(xs)))
hit = intersection.hit(xs)
dprint("hit: {}".format(hit))
point = ray.position(hit.t)
dprint("point: {}".format(point))
normal = hit.object.normal(point)
dprint("normal: {}".format(normal))
eyev = -ray.direction
dprint("eyev: {}".format(eyev))
c = lighting(hit.object.material,
light,
point,
eyev,
normal,
components=True)
dprint("color: {}".format(c))
color = c[0] + c[1] + c[2]
pix[x, y] = color.rgb()
pause()
print(x)
im.show()