Filling Cuts from Cutting Plane via Opacity Mask?

Hello Friends,

I’m currently trying to create a cutting plane for static meshes.
I’ve modified the location base opacity tutorial from ue4 (- YouTube) to clip all objects within a cube/plane volume that can be adjusted in the editor.

So far everything works well. This is probably a shot in the dark, but I was wondering… is there a way to temporarily fill the hollow spaces in the clipped materials for static meshes? See figures below

Thank you for your time!

you might be able to integrate this into your material.