[ODE] Empty bodies crash with trimesh

[Jeff Kershner]

My physics geometry for a non-moveable test world is a single node in OSG
with 4 "geometries."   I create these 4 geometries as trimeshes and do not
associate bodies with them.

 

The problem is that in the NearCallback function, dBodyID b1 and dBodyID b2
are both NULL and dCollide crashes.

 

I think this has to do with a wall intersecting a floor and both don't have
bBodyIDs.

 

Do I need to check for b1 and b2 both being null and exit that collision
callback function?

 

Or is there something else wrong?

 

 

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