How to make particles cluster


How can i attract particles to each other, and create small group\clusters?
I cant use geometry and texture only the PF event.
any ideas?


Can you explain why you can´t use texture or geometry objects? Those being the obvious choices to do this…
Maybe work something simple out by first birthing low density particle and then spawning more particles from them, deleting the parent?


My goal is to create particles in random 3d space,make them randomly move in space and
after some time the particles start attracting to each other, and forming small groups.