Attach particles to surface of physX simmed geo?

[clasyc]

Actually, looking at the code for the family filtering, there's a slight bug where if particles have no parent and no siblings they're treated as siblings by mistake in some situations. I'll fix this for the next build.

For what you want, you don't need family filtering anyways. Use clustering. Set a custom properties operator to assign some float value to particles in event A, some different float value in the same channel to particle in event B, then choose "cluster if different" for that channel. Now particles will bind to other particles that don't share the same cluster value.

Just what I needed, never thought of that. Thanks.

A lot of useful insights in this thread