- body-sleep-with-group body #!optional groupprocedure
When objects in Chipmunk sleep, they sleep as a group of all objects that are touching or jointed together. When an object is woken up, all of the objects in it’s group are woken up. this function allows you group sleeping objects together. It acts identically to (body-sleep) if you don't pass a group by starting a new group. If you pass a sleeping body for group, body will be awoken when group is awoken. You can use this to initialize levels and start stacks of objects in a pre-sleeping state.