Oh yes I’ve heard about render target too ! as @Frenetic mentionned too
Render targets looks like a powerfull but very complex tool to make many things, if i understand correctly, render target can be used to get the UV’s of a mesh and then draw on it ?
Also it’s confusing to know if it’s possible to make this system with vertex painting, some people seems to say it is not, some says it is, i found this tutorial that mixes layered material with vertex paint https://www.youtube.com/watch?v=FF5HZ6Cq8GY&t=24s so i don’t see why it shouldn’t work
Thank you again