Year 2024 I ran into this problem as well. The problem: 1. Obvious seams when Raytracing turned on while SSS applied. 2. I didn't use any UDIM scheme. My character is splitted into two meshes, one for head and one for body, each has its own single tile UV. 3. The seam appeared where the head joins the body. The solution:1.…
for human character I just auto lay out the uv's and rebake from the original at double resolution. Takes ten minutes and result is the same except less materials to fuss with setting up. Like mentioned, I was using 4 x 4k textures, baked them to a single 8k texture. No resolution loss. @Sreliata
Yeah I just realized. Did you ever experience that this might not change anything at all? My character has a second UV layer on which the Ambient Occlusion lays. If I choose the 'second' set of UV's in the UV Set option in Marmoset, nothing changes and the _O map layout remains completely scrambled. It's.. weird, somehow.…