I’m trying to create a big room using 400x400x20 panels for floor, ceiling and walls. I noticed if I use static meshes then various artifacts appears, like seams. But with BSPs of same size it looks much cleaner and there is no seams at all. I use lightmap resolution of 128 for static meshes and of 8 for BPS (by the looks of lightmap density view it’s pretty similar). I also applied different tricks found on answerhub like stetting UV grid spacing for SM to 1/(128-2) etc. On the attached screenshot floor, ceiling and walls are made of 400x400 blocks, BSP on the right, SM on the left. I use 4.6.0 preview.
Can anybody explain this difference?