lua.wetgenes.bullet.body.cmask
body:cmask(bits)
bits=body:cmask()
body:cmask(0x7fffffff)
Set or get body cmask bits. You have 31 bits, so use 0x7fffffff to set all. This body will only colide with another body if the other bodys cgroup has a bit set that is also set in our cmask.
cgroup bits are all the groups this body belongs to.
cmask bits are all the groups this body colides with.