def path_push(path: Path, ray: Ray):
# update stuff appropriately
if path.direction == Direction.STORAGE.value:
# don't change anything, this is just a stack. this reduces wasted calculation and preserves first-vertex values
pass
elif path.ray is None:
# this shouldn't come up
pass
else:
G = geometry_term(path.ray, ray)
path.ray.direction = unit(ray.origin - path.ray.origin)
if path.ray.prev is None:
# pushing onto stack of 1, just propagate p and color (?)
ray.color = path.ray.color * G
ray.p = path.ray.p * G
else:
# pushing onto stack of 2 or more, do some work
brdf = BRDF_function(path.ray.material, -1 * path.ray.prev.direction, path.ray.normal, path.ray.direction,
path.direction)
ray.color = path.ray.local_color * path.ray.color * brdf * G
ray.p = path.ray.p * G * BRDF_pdf(path.ray.material, -1 * path.ray.prev.direction, path.ray.normal, path.ray.direction,
path.direction)
ray.bounces = path.ray.bounces + 1
# store new ray
ray.prev = path.ray
path.ray = ray
def path_push(path: Path, ray: Ray):
# update stuff appropriately
G = geometry_term(path.ray, ray)
path.ray.direction = unit(ray.origin - path.ray.origin)
if path.ray.prev is None:
# pushing onto stack of 1, just propagate p and color (?)
ray.color = path.ray.color * G
ray.p = path.ray.p * G
else:
# pushing onto stack of 2 or more, do some work
brdf = brdf_function(path.ray.material, -1 * path.ray.prev.direction,
path.ray.normal, path.ray.direction,
path.direction)
ray.color = path.ray.local_color * path.ray.color * brdf * G
ray.p = path.ray.p * G * brdf_pdf(
path.ray.material, -1 * path.ray.prev.direction, path.ray.normal,
path.ray.direction, path.direction)
ray.bounces = path.ray.bounces + 1
# store new ray
ray.prev = path.ray
path.ray = ray