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Thanks very much for the responses! I clearly have a lot to learn about shaders. (And normal maps). Someone else told me it was likely a 5-way...
I hope this is the right forum; I couldn't find a better place to ask a game-art question, and I am working in Unity, hopefully this isn't too...
Thanks for the reply, and for the ideas! Never thought I'd study fluid dynamics for a video game but I might just take a crack at it! :) I'm sure...
TLDR: Thanks. I just wanted to say thank you for making this. I spent 2 days searching the internet for this exact thing and it didn't even dawn...