What kind of freak would code things on Dec 31st? That’s right, it’s me.
So. Suppose you are making a game using 3D engine for graphics and 2D engine for physics (that uses convex shapes only). So, most probably, you would need to project your model onto your physics plane, find convex hull of resulting points set and create corresponding shape from that. Since today (rev 891 I think) you have one part of this done for you by sandy, namely 2D convex hull.
Check it out, and see ya’all in 2009.