Rendering priority

[delnian]

what you would do is give the actors you want to take account in your postprocess volum a custam Stencil and then its completley dynamic. Think of it like a realtime rendered mask.
If it should always render above everything this could possibly also be done in a Material.

Maybe you tell us a little bit about what you wanna archive, maybe there are other ways as well.

In my scene, there are different Opaque dynamics actors and only one transparent one. I want this transparent actor to render always higher than just one of the Opaque dynamics actors and render it by default on all other actors.