def scatter(self, r_in, rec):
condition = (rec.t > 0) & rec.front_face
scatter_direction = Vec3.random_in_hemisphere(rec.normal)
scattered = RayList(rec.p.mul_ndarray(condition),
scatter_direction.mul_ndarray(condition))
attenuation = Vec3List.from_array(condition) * self.albedo
return scattered, attenuation
def scatter(self, r_in: Ray, rec: HitRecord) \
-> Optional[Tuple[Ray, Color]]:
scatter_direction: Vec3 = Vec3.random_in_hemisphere(rec.normal)
scattered = Ray(rec.p, scatter_direction)
attenuation = self.albedo
return scattered, attenuation