[ODE] Another question about contact joints

[Jon Watte (ODE)]

Most users expect both geoms to be non-NULL, because a contact is (by 
definition) between two geoms -- else there can't be a contact. To know 
that the geom is immovable, users usually check for the body ID of the 
geom, and if it's NULL, it's immovable.

If you only use your contacts yourself, and this code is not intended 
for others, and your nearcallback/collision code knows how to deal with 
NULL g1/g2 fields, then I don't think you need to fill them out.

Cheers,

			/ h+

Guru2012 wrote:

> My question is if those values can be set to NULL or 0. More 
> specifically, I am creating a contact joint with an immovable object, so 
> I'm leaving the contact joint's second body null, but in that case, can 
> I leave g2 null? In addition, can I simply leave both values in the 
> dContactGeom null?
>  
> -Andrew