Flip Repel/Attract help

[noumiere]

Hi all,

I'm trying to replicate an effect that involves sourcing Red and Blue particles on a Sphere that have an @attract attribute which determines if they repel or attract.

I have run into a problem that I assume is quite simple but I have gone over the whole thing a few times without any success.

I suspect the issue is in my DOP network where I have a Sop Solver that updates the Velocity through a Volume VOP using a Gradient and Volume Sample and outputs it to a bind export 'v', however I have tried to bind export it to 'vel' but it still doesn't work.

There's a Gas Surface Tension that tries to keep the Red and Blue particles together.

I have attached the file and would appreciate if someone could point out what I am doing wrong as I'm trying to learn this effect by breaking it down.

Thanks and appreciate any insight!

FLIP_zero_gravity_v01.hip

[noumiere]

I think the issue is because the velocity is not coming in to the simulation from the sourcing.. however any insight would be welcome as I still haven't gotten it to work

[Diego A Grimaldi]

Hey @noumiere
The problem is that you are doing volume operations inside the sopsolver and the flip solver doesn't recognize what you are feeding in
If you do it with point operators should work fine

[noumiere]

Thanks a lot Diego.It had to be something frustrating that I failed to see. I appreciate the help, it works now!

[Diego A Grimaldi]

My pleasure