[ODE] Camera should be a body with zero mass?

[andresch at cox.net]

> Why not just make the camera weigh 1 millionth of what the guy weighs?
Hooking proportionally big masses to small ones is bad according to the docs...(I tried it, it wasn't pretty)

> Is there any reason why you need the camera to be modelled as a
>physical body? If there isn't then it's probably best not to.
No "reason" except that ODE can do the work of figuring out where the camera should be, and if I'm going to "collide" the camera with stuff to keep it from passing through walls and such it needs to have a geom and body, right?

> Just don't give it a rigid body.
Wouldn't this have the opposite affect? a geom without a body is an "infanatly masive" object, like the "floor" in all the demos. If my camera has no body, it won't it be stuck in one place forever?