Hello, your question is vague... here is what I found: https://en.wikipedia.org/wiki/Clipping_(computer_graphics) it seems to be related to 3D. Could you elaborate on your question, what are you trying to do?
Sure bro. I know this question is related of the computer graphic, but moreover, my friend tells me do you know Clipping Algorithms, first time I think it's may be similar Adobe photoshop pen tool that's why I ask here. But your source is good and you're