Strange blocks on the model after finished lightmass build

Hello everyone,

I’m having a problem with my models. After finished Lightmass build I see blocks… blocks everywhere.

Probably it might have something to do with UV, but I have no idea what causes the issue.

I’ve been texturing the object with Texture Atlas blender add-on.

Ok the texture atlas addon in blender creates a 2nd UV map for the Atlas. Unreal seems to be using that UV for lightmaps. In my experience try to delete the additional UV map in blender and have unreal generate lightmaps as a quick fix.