Hi everyone, I'm trying to make each connected points(@class) being deleted overtime when they above XZ plan.

I made a bounding sphere for each @class and copy to itself with decreasing @pscale when it's above the plan.

And delete the points outside the sphere.

It works well when I set it to “single pass”

but it works totally wrong when merges all iterations together…

I have attached an example file below, it'll be fantastic if someone can help me out with this.

you can't use Solver SOP or anything else that uses DOPs inside of the For Each
It's be difficult to keep track of the individual simulations in for each especially sine you can have different number of pieces each frame, etc

what about doing it without for each?
here is an example using your technique with bounding sphere, but is easily extendable to other ways like eroding edge particles etc…

Thank you so much Tomas! It works really well just as what I need it to be