came across sort of a cheat code to drawing multiple materials onto objects
there's a node to split out your vertex paint into RBG values, which can then be used as the input to the mixer. Usually one would have to make an alpha layer that has black and white only, and stack those on top of each other--this makes things a little quicker (if you're using fewer than three materials on an object
https://gamefaqs.gamespot.com/a/forum/d/dd497d80.jpg
https://gamefaqs.gamespot.com/a/forum/8/8a1b7ab6.jpg
https://gamefaqs.gamespot.com/a/forum/7/7633f2e3.jpg
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