I literally took my old material.. and removed its dirt material from the chain and instead did it substrate way and made it a layer above the rest of the original material..
ANd substrate turned it into a massive instruction count that i mentioned…
And to add insult to injury… it does not make my dirt over metal look THAT much better. Its barely perceptible.
And also you may not be following.. 800 was the original material originally. 2500-3000 was the substrate version method. Doesnt make much sense to me… seems like a dumb idea thats too early to implement before everyones on a super comptuer. So to clarify its 2 layers with all these instructions.
I personally deleted all my substrate changes and went back to source control to get the old version of my material back. Substrate seems like an idea thats more geared to special fx for movies at this point… Not real time rendering. Unless an instruction in substrate is somehow cheaper.
But, yes, substrate is a new layering method, which apparently is pretty costly.
It does look much better is some very particular cases, but I don’t think dirt on metal is one of them. It’s more for layers that can interlace in some way.