Not another overlapping UV thread

[PaleoNeo]

Hi guys,
do you have any idea why do I get the overlapping UV error message even if the lightmap UVs are perfect, made first in max and then with built in unwrapper?
Cheers

[ZacD]

What do the UV’s for the lightmap look like within UE4 (from withing the Static Mesh Editor)?

[Construc]

If your mesh has enough polygons + the automated UV unwrapper isn’t set to the right ‘min lightmap resolution’, then you will get UV islands that are smaller than 1 lightmap pixel, which causes the editor to throw the ‘lightmaps are overlapping’ issue.
to fix this, go in to the alt-0 viewmode and check that the resolution for your mesh is large enough for the lightmap. you need at least 3 pixels around each island for the lightmap padding to work. then, go in to the build options and set the ‘min lightmap resolution’ to the right size and rebuild.

[macoll]

@Construc_;558412

If your mesh has enough polygons + the automated UV unwrapper isn’t set to the right ‘min lightmap resolution’, then you will get UV islands that are smaller than 1 lightmap pixel, which causes the editor to throw the ‘lightmaps are overlapping’ issue.
to fix this, go in to the alt-0 viewmode and check that the resolution for your mesh is large enough for the lightmap. you need at least 3 pixels around each island for the lightmap padding to work. then, go in to the build options and set the ‘min lightmap resolution’ to the right size and rebuild.

I second that

Plus, sometimes in max i have the same problem even if my UVs are perfect…Solution: before exporting i make a ‘Turn to poly’ and put 3 at the ‘Limit Polygon Size’ and voilà…