How to make the back of a cube dashed?
Hello,
I try to make some kind of 3D-geometric software for my open-source-cross-platform project. The problem is how to make the back of a cube (which unseen in real world) keep dashed, even when it was rotated. I try to search in many math books, and try to find by myself, but I can't find the solution yet.
With many respect, where can I find some reference in this problem?
Thank you very much
Best regards,



