A consistent CSG model is one which is made ! up of solid objects with no dangling surfaces. In rayshade, it is quite easy to construct inconsistent models, which will usually appear incorrect in the final images. ! In rayshade, CSG is implemented by maintaining the tree structure of the CSG operations. This tree is traversed, and the operators therein applied, on a per-ray basis. It is therefore difficult to verify the consistency of — 313,322 —-