Trying to Render a mesh or material inside of a growing volume.

I’m trying to only render a static mesh or material inside of a volume or on the other side of a material.
The idea is that when you throw down your “surveying tool” is will measure things out.

Right now the blue measurements are part of a blueprint that toggles on once the circular mesh(measured area) has scaled all the way up.
I can’t seem to figure out how to render an object differently if it’s inside a volume.

If anyone has any idea of where to even start looking for a similar effect I would really appreciate it.

Here’s a video example of what I have:


I think what you’re looking for is ‘CustomDepth’. Not sure exactly how it all works, but someone posted a lengthy tutorial series experiementing with it. Give it a search, and you should do just fine.