Postprocess "Split" under/above water.

Development Rendering
1

Hi

I was wondering if anyone knows how to “Split” PostProcess under and above water on camera.:rolleyes:
I saw something on forum using “Stencil” but I don´t know how to use that. :frowning:
This is huge problem for me and my team.

Thank you in advance for your help :slight_smile:
Bye:p

EDIT: Using blueprints.