It's an excellent idea to provide additional primitives like that. One of the techniques I tried was to make myself some additional primitives in Anim8or for use in Vue, but then I ran into the problem of Vue's object dimensions being relative to themselves. I understand that Vue Pro has a better mechanism for this, so perhaps I'll try again in the future when I upgrade. I kinda wish there were a modeller around that was geared specifically for CSG, but I guess nobody wants to do that and I'm just plain weird. :) Karl.