[ODE] Holding bodies like in HL2

[David Walters]

> in NearCallback, and cout never happens. But when I check for capsule,
> it always happens. It only collides with the first body! How to get
> other body? Can you show any code?
> Thanks.

I'm not sure exactly what you mean. The ray collision only reports one
contact for each geom - but it should occur several times for all
geoms along the ray (note that it's in a random order).

You need something outside of near_callback, as that function only
represents one geom-geom pairing.

If you were expecting a box collision and not getting one - then check
your ray is in the right direction, starts from the right place and is
long enough to reach for the contact to happen.

Regards,
Dave.