For something static it's easy . Just render a picture of whats behind , a cube map projection maybe, and distort /displace it by a normal map with vector warp node .if you want time of day changing and something moving behind the glass you need a special render target in the engine. A dynamic cube map maybe or have this…
I'm having a bit of trouble understanding this. I'm not sure how to make the tiles transparent, and I can't see the entire graph, which makes it hard to understand how everything is connected. Do you happen to have a graph you could share with me? It would really help me see all the nodes involved.