Occludes light cast by a Light2D, casting shadows. Occludes light cast by a Light2D, casting shadows. The LightOccluder2D must be provided with an [OccluderPolygon2D] in order for the shadow to be computed. Return the light mask of the LightOccluder2D. Return the OccluderPolygon2D that defines the LightOccluder2D. Set the LightOccluder2D light mask. The LightOccluder2D will cast shadows only from Light2Ds that belong to the same light mask(s). Set the OccluderPolygon2D that defines the LightOccluder2D. The LightOccluder2D's light mask. The LightOccluder2D will cast shadows only from Light2D(s) that have the same light mask(s). The [OccluderPolygon2D] used to compute the shadow.