I made this, because I had to do something waiting for the retro results. It's not very impressive, so don't expect too much. I believe it can be used if an enemy (with an ellipsoid like shape) is hit by you in a shooter. With this you can also calculate the exact point of intersection to do some blood effect.
Anyway, it's not much, but it can be useful. It only works in DB, I think.

Kevil

And here is one with a triangle.

This could be useful for placing bulletholes in your levels, because you will get the exact location.

Kevil