def __init__(self, intersection, ray: rays.Ray, all_intersections=None):
self.t = intersection.t
self.object = intersection.shape
self.point = ray.position(self.t)
self.eyev = -ray.direction
self.normalv = intersection.shape.normal_at(self.point)
self.inside = False
if self.normalv.dot(self.eyev) < 0:
# If the dot product of the eye vector and normal is negative, they
# are pointing away from each other, which means you're inside of
# the object.
self.inside = True
self.normalv = -self.normalv
# This is the point just a tiny bit above the surface, used to avoid
# rounding errors
self.over_point = self.point + self.normalv * EPSILON
# And this one is a tiny bit under the surface to avoid rounding errors
self.under_point = self.point - self.normalv * EPSILON
self.reflectv = ray.direction.reflect(self.normalv)
self.n1 = 1.0
self.n2 = 1.0
if all_intersections is not None:
containers: List[Any] = []
for isection in all_intersections.intersections:
if isection == intersection:
if len(containers) == 0:
self.n1 = 1.0
else:
self.n1 = containers[-1].material.refractive_index
if isection.shape in containers:
containers.remove(isection.shape)
else:
containers.append(isection.shape)
if isection == intersection:
if len(containers) == 0:
self.n2 = 1.0
else:
self.n2 = containers[-1].material.refractive_index
break
self.schlick = self.compute_schlick()
