Looking for a Shader

I am absolutely no shader writer so what I am trying to find is one which "removes" a mesh when passing thru the shader. I know, it's tough to describe, so I'll tell you what I'm trying to do.
I have a holographic map and I would like to simulate movement of the map by sliding it across the table. But when buildings, et. al. pass over the boundaries of the table, they disappear. Since the table is only so large.
I have seen this shader on the Asset store, just not sure what it was called.

If you understand this post, let me know.

 

In case anyone is interested, I came across this [ https://codeburst.io/unity-cross-section-shader-using-shader-graph-31c3fed0fa4f ] which may do the trick.