itch.io

It has second camera that renders everything around this glass circle and then projects it onto glass

We’ve actually published source code of this project here:

https://github.com/faranlegt/r2d3

Shader you are looking for is here: https://github.com/faranlegt/r2d3/blob/main/Assets/Materials/Cabin%20Shader.shadergraph

You can download it and open it with https://shadergraph.stelabours.com/