Clumping Particles

[YoyoBoy]

I have a stream of particles (spheres) and I would like to be able to stop one or two on a specific frame, and make any particle that touches them stop the moment it touches them, and stop any particle that touches those, etc., piling up, creating a clump. Is this doable?

It would also be acceptable if I could stop them by hand as needed and not worry about collisions.

Thanks!

[joconnell]

If it's only pflow, I'd be inclined to set up your first system with the spheres, make them stop as you wish and then place a sphere deflector in the area where they stop. Make a second pflow system which has all of the sphere deflectors as collision objects which move your particles into a stop event which uses a keep apart event - that's designed to push particles away from each other but used with negative values to make them clump. Otherwise you're looking at some of the glue effects in particle flow box#2 which you should have built in if you're on max 2014.