It's not clear to me what you're trying to do but typically when you want shapes to match with other shapes like that, you'll use clustering with custom float values.
You can use groups...it just may complicate things because groups also determine collision overlap for PhysX. If you want to use groups you need to change the dropdown option from 'overlapping' to whatever criteria you want (ex: 'equal to own' - where particles will only match up with other particles that have the same group assignment).
You can use groups...it just may complicate things because groups also determine collision overlap for PhysX. If you want to use groups you need to change the dropdown option from 'overlapping' to whatever criteria you want (ex: 'equal to own' - where particles will only match up with other particles that have the same group assignment).