Hope your code takes into account that 3d faces can have the two parallel lines shown, and the others hidden. I did a code like the one you are talking about a long time ago, but I did it with lines because of that reason.
Uhhh, ... No. I didn't know you could do that with 3DFace objects. Wow, talk about opening a can, I'm learn'n all kinds of new stuff with this post.
So how can these objects become invisible, or partially invisible ?? Obviously from what you and Lee have said, there must be a way to manipulate each face of a 3D Face object, and appearently make the whole thing invisible. But how would a user do it ?? There has to some other way besides just using code to manipulate it. Or is it a long drawn out process and that is why the lack of comments regarding the manipulation is being made ??
Actually, perhaps my code does take into account a partial invisible object, I simply get the four corners (10, 11, 12, 13) and draw a rectangle, then delete the 3D face. Could I be possibly causing more problems than I'm worth doing it this way ??
Thank you all for you input and help with this ... interesting find of mine.