[Algorithms] Bullets on walls

[Tiziano L. <tl...@fl...>]

Hi!
I added wallmarks in my 3d engine but when I fire on the border of a wall I would like to clip the wallmark to the wall. 

I have some ideas but I think they are a bit slow... (manual clipping, texgen, stencil?)

How do you do this?

Thanks for any help!