This shader is based on a unity asset I bought and dissected for Subzero Heroes (it no longer resembles the original asset cause I had to rewrite all the code. Credit to Solunar Productions nevertheless). It allows you to overlay several image layers per section and has a lot of customizable variables for different effects. If you've played Subzero Heroes: This is what rendered all the backgrounds in the final level.
All documentation is at the top of the lua file, including an usage example.
