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Particle Fluid Surface Masking


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I'm having a bit of a problem trying to mask out part of the fluid surface that's underneath the top surface in a narrowband flip fluid simulation.

I have a whale breaching the surface, but I don't want the surface underneath to be there... just all the top parts with splashes... nothing underneath... not even the surface that surrounds the whale's body below the top water surface. I remember seeing this done in older versions of Houdini using some sorta VDB masking using camera or whatever... but can't figure it out. So how is this done please? :) thanks!

Edited by Syrena
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