Ok so i have come across many “overlapping uvw” issues but they are mostly for earlier unreal engine versions which were fixed by pressing some buttons in the mesh editor that dont exist anymore.How do i get to fix that then.Can someone help me with that? I saw a picture showing “ticking” a box in the importing fbx menu but thats ticked for me so i saw no diference,same error as before.
The process changed in 4.5 (a while ago) and the new method is detailed here for how to generate a lightmap.
There are still some limitations with the lightmap generation method though. It will not create any new seams in your UV. It will only re-pack the existing texture UV (UV0 in Unreal, or UV1 in modeling programs).
It’s best to have at the very least a setup texture UV that is broken apart and flattened in order for the re-packing of the lightmap UV to work correclty without overlapping seams.