// set an outer proposed boundary for parent object(s) // allows the ray-tracer to do a quick check on the Bounding Shape, // and if outside, it skips checking this object, which can speed // up overall rendering of complex shapes. Note that this // is not a 100% guaranteed clipping shape... use the // clipped_by statement for that. bounded_by { box { <-1,-1,-1>, <1,1,1> }