a quick and fast way 2 fake per poly collision detection is 2 use hit boxes. the idea is this...
calculating each and every finger in ur hand for collision detection is not likely 2 produce any noticeable difference (other than decrease the framerste).
do why not use a cube hitbos each for ur arm and hands...
even half life 1 engine of 1997 supports it. Why not 3dgs?