Disable a particular object-object collision

[hearsedriver]

Hey there,

I have two btRigidBodies which shall interact with the rest of the physics world, but not with each other. For the combination of these two particular objects, I want to disable collision testing because it eventually leads to calling the gContactAddedCallback (and whatever happens on Bullet-side before) much more often than I need it.

What's the best way to do this with Bullet?

Thanks
hd

[Erwin Coumans]

There are several ways to filter out collisions between particular objects.

See custom collision filtering in this wiki article:
http://www.bulletphysics.com/mediawiki- ... _Filtering

Do you have any idea why the gContactAddedCallback is called so often?
Thanks,
Erwin

[hearsedriver]

Do you have any idea why the gContactAddedCallback is called so often?

Yes, I do. I have an object which I move manually along another object, like a train on rails, and I do not want to interact train and rails but train with all other objects and rails with all other objects.

I will have a look at the Wiki page, thank you very much.

hd

[Francescu]

There are several ways to filter out collisions between particular objects.

See custom collision filtering in this wiki article:
http://www.bulletphysics.com/mediawiki- ... _Filtering

Do you have any idea why the gContactAddedCallback is called so often?
Thanks,
Erwin

Hi,

Is it possible to reset the group / mask collision filtering for a rigidbody once it has already been added to the world?

Thanks

--Frank