Hi

Seems like a long time ago the filters and masks worked in a way that allowed for one-way collisions, meaning that only one of the bodies reacts to the physical impact.

http://www.bulletphysics.org/mediawiki-1.5.8/index.php?title=Collision_Filtering

What’s the easiest way to do this nowadays? I have a moving rigid body (A) and a bunch of other rigid bodies. They all should collide with each other, but so that body A’s motion isn’t affected by the collisions.

You set the mass of the one object to zero, then things bounce off it but it will never move from a collision.

Thanks for the reply.

Setting mass to 0 = static object, right? Problem is body A would have to move due to gravity & collide with some static bodies as usual, but there’s a certain group of dynamic rigid bodies that should not affect A’s movement upon collision.

I’ll just set the mass of those other rigid bodies close to 0 and see how far i can get with that.

Looking at the Bulletphysics Wiki, it looks like it wouldn’t be trivial even if
i had access to the source and could overwrite the collision callbacks and stuff All the code samples there deal with determining if a PAIR should collide.