cam_y = cam_x.cross(gaze).normalize() * fov
Ls = [None] * w * h
for i in range(w * h):
Ls[i] = Vector3()
for y in range(h):
# pixel row
print('\rRendering ({0} spp) {1:0.2f}%'.format(nb_samples,
100.0 * y / (h - 1)))
for x in range(w):
# pixel column
i = (h - 1 - y) * w + x
for s in range(nb_samples):
# samples per pixel
dx = rng.uniform_float()
dy = rng.uniform_float()
#create camera vector multipliers that range between screen-space coordinates of -0.5 to 0.5
cam_x_multiplier = (dx + x) / w - 0.5
cam_y_multiplier = (dy + y) / h - 0.5
directional_vec = cam_x * cam_x_multiplier + cam_y * cam_y_multiplier + gaze
L = Vector3()
ray = Ray(eye + directional_vec * 130,
directional_vec.normalize())
if args.passtype == "direct":
L = shadow_ray_pass(ray, rng)
elif args.passtype == "albedo":
L = albedo_pass(ray, rng)
Ls[i] = Vector3()
for y in range(h):
# pixel row
print('\rRendering ({0} spp) {1:0.2f}%'.format(nb_samples * 4,
100.0 * y / (h - 1)))
for x in range(w):
# pixel column
for sy in range(2):
i = (h - 1 - y) * w + x
# 2 subpixel row
for sx in range(2):
# 2 subpixel column
L = Vector3()
for s in range(nb_samples):
# samples per subpixel
u1 = 2.0 * rng.uniform_float()
u2 = 2.0 * rng.uniform_float()
dx = sqrt(u1) - 1.0 if u1 < 1 else 1.0 - sqrt(2.0 - u1)
dy = sqrt(u2) - 1.0 if u2 < 1 else 1.0 - sqrt(2.0 - u2)
d = cx * (((sx + 0.5 + dx) / 2.0 + x) / w - 0.5) + \
cy * (((sy + 0.5 + dy) / 2.0 + y) / h - 0.5) + gaze
L += radiance(
Ray(eye + d * 130,
d.normalize(),
tmin=Sphere.EPSILON_SPHERE),
rng) * (1.0 / nb_samples)
Ls[i] += 0.25 * Vector3.clamp(L)
write_ppm(w, h, Ls)