Hi. what I'm looking for is quite simple. I am trying to ignore/exclude the self collision between certain grains. Let's say I have blue, green and red points as grains (they need to be within the same sim)


I want the blue grains to collide with red and green but not with blue.
red grains to collide with blue and green but not with red.

green grains to collide with blue and red but not with green.

I tried adding collisiongroup and collisionignore but it only seems to work with external colliders. is there a way to do this?