I want to control two Flip Source separately. Two Pop Group nodes are used to group two sources (red nodes) as GP1 and GP2. Two groups can't be inherited after Flip Solver. Copy Data Node (yellow node) is used to copy GP1 and GP2 back. Wind Force node only affects the group,GP2. GP1 will not be affected by any force.

Actually, the network didn't work as what I expected.

So, what's wrong with the network?

I need some suggestions to hit my head.

Thank you.

Tony