Create a rotating wheel

[Rawlyn]

I've made a very similar shape when messing around with chipmunk in the past, but with only three shapes attached to a body... I've attached an image to show the arrangement of shapes I used.
From what I understand, if shapes are attached to the same body they don't generate collisions, so any amount of overlapping should be fine. (Please someone correct me if this is a horrible mistake!)

It's only a very, very minor optimisation... but every little counts! (I've never coded for the iPhone before, but I imagine it helps to squeeze everything you can out of it.)

[slembcke]

Yep, you can attach as many overlapping shapes as you want to a body. There is an early exit for this, so it shouldn't use very much CPU considering these non-collisions.