ÔÚ 06-11-20£¬sssa2000<sssa2000 at 163.com> дµÀ£º> for example, i have 2 boxes in a room.> the room is made by 4 planes.> i want there are no collisions between the 2 boxes,> how can i do it?> Thanks! hi,use dGeomSetCategoryBits and dGeomSetCollideBits. kaikai