Hi there.
I really like the Material Layer system. Its super efficient to work with and I would love to use it. However, using the Pathtracer those materials come out black. Maybe there is a magic CVAR that fixes this…but so far I haven’t found one. My guess is that it’s not supported. Maybe it doesn’t like specific operations.
I looked through the documentation and the list of what is and is not supported, but material layer system wasn’t mentioned. And tbh, I haven’t tried in UE 5.4 yet. It didn’t work in 5.3 and nothing was mentioned in the update notes so I guess it’s still not working.
If someone knows more, please let me know.