Thank you very much Ivan for that detailed answer! SRP is not an issue - for my current project everything is in SRP yet and I do have Amplify Shader Editor. The latest version supports URP and I converted last week another shader with it to URP so probably it'll work too if I go for it. For the walls I just make separate invisible objects (that aren't related to the effect) with RB's and colliders. Well performance is allways a bitch but I'll test it out by myself.