This is copy of my post [forums.odforce.net] odforce forum.

Hello,

How do you make sure that non-simulating geometry is hidden (in Render and Viewport) until it becomes active and then stay visible as well simulated once activated?

I am trying to make the geo visible only when it's inside active group.
I have attached a file to show intentions.

As advised on ODForum, I tried to use a material in SOP Solver after Active node in DOP. But that doesn't work. And even if that worked. It would mean that I need to somehow do the same for each material ID?

Also, Alpha in point and/or primitive SOP works in viewport but not in Render.

Thanks