def test_ray_differential(self): r = Ray(Point(0, 0, 0), Vector(1, 2, 3)) rd = RayDifferential(Point(0, 0, 0), Vector(1, 2, 3)) # test copy constructor from Ray rd.has_differentials = True rd1 = RayDifferential.from_ray_differential(rd) self.assertTrue(isinstance(rd1, RayDifferential)) self.assertEqual(rd1.o, rd.o) self.assertEqual(rd1.d, rd.d) self.assertEqual(rd1.rx_origin, rd.rx_origin) self.assertEqual(rd1.ry_origin, rd.ry_origin) self.assertEqual(rd1.rx_direction, rd.rx_direction) self.assertEqual(rd1.ry_direction, rd.ry_direction) self.assertEqual(rd1.has_differentials, rd.has_differentials) # test copy constructor from Ray rd2 = RayDifferential.from_ray(r) self.assertTrue(isinstance(rd2, RayDifferential)) self.assertEqual(rd2.d, r.d) self.assertEqual(rd2.has_differentials, False) # test constructor from parent ray rd3 = RayDifferential.from_ray_parent(r.o, r.d, r, r.mint) self.assertTrue(isinstance(rd3, RayDifferential)) self.assertEqual(rd3.depth, r.depth+1) # test operator() p = rd(1.7) self.assertEqual(p, Point(1.7, 3.4, 5.1))
def test_ray_differential(self): r = Ray(Point(0, 0, 0), Vector(1, 2, 3)) rd = RayDifferential(Point(0, 0, 0), Vector(1, 2, 3)) # test copy constructor from Ray rd.has_differentials = True rd1 = RayDifferential.from_ray_differential(rd) self.assertTrue(isinstance(rd1, RayDifferential)) self.assertEqual(rd1.o, rd.o) self.assertEqual(rd1.d, rd.d) self.assertEqual(rd1.rx_origin, rd.rx_origin) self.assertEqual(rd1.ry_origin, rd.ry_origin) self.assertEqual(rd1.rx_direction, rd.rx_direction) self.assertEqual(rd1.ry_direction, rd.ry_direction) self.assertEqual(rd1.has_differentials, rd.has_differentials) # test copy constructor from Ray rd2 = RayDifferential.from_ray(r) self.assertTrue(isinstance(rd2, RayDifferential)) self.assertEqual(rd2.d, r.d) self.assertEqual(rd2.has_differentials, False) # test constructor from parent ray rd3 = RayDifferential.from_ray_parent(r.o, r.d, r, r.mint) self.assertTrue(isinstance(rd3, RayDifferential)) self.assertEqual(rd3.depth, r.depth + 1) # test operator() p = rd(1.7) self.assertEqual(p, Point(1.7, 3.4, 5.1))
def generate_ray_differential(self, sample): """Generate a RayDifferential from the camera.""" # Generate raster and camera samples p_ras = Point(sample.image_x, sample.image_y, 0) p_camera = self.raster_to_camera(p_ras) ray = RayDifferential(Point(0, 0, 0), normalize(Vector.from_point(p_camera)), 0.0, float('inf')) # Modify ray for depth of field if self.lens_radius > 0.0: # Sample point on lens lens_u, lens_v = concentric_sample_disk(sample.lens_u, sample.lens_v) lens_u *= self.lens_radius lens_v *= self.lens_radius # Compute point on plane of focus ft = self.focal_distance / ray.d.z p_focus = ray(ft) # Update ray for effect of lens ray.o = Point(lens_u, lens_v, 0.0) ray.d = normalize(p_focus - ray.o) ray.rx_origin = Point.from_point(ray.o) ray.ry_origin = Point.from_point(ray.o) ray.rx_direction = normalize(Vector.from_point(p_camera) + \ self.dx_camera) ray.ry_direction = normalize(Vector.from_point(p_camera) + \ self.dy_camera) ray.time = sample.time ray = self.camera_to_world(ray) ray.has_differentials = True return 1.0, ray