Let's say I have a large asset of an old stone wall. I want the wall to have moss, dirt and a stone base material. I know I need to make masks using Painter that I then use in UE4 with my tiling materials. Here's what I know... From what I understand is you make 2 UV channels. UV1 is a 0-1 layout of all the UVs with no…
UV1 (uv0 in unreal) for your tiling textures, which are scaled properly in your 3d program to the correct texel density. This can be scaled past 0-1 and overlapping/inverted etc. UV2 (uv1 in unreal) for unique unwrap within 0-1 for masks, light maps, etc. Cannot be overlapped, or inverted. You can use different or…