The floor and wall are made of boxes with no bottom face. The UV layout is one big island and the light map resolution is set to 512. The lines appear even when I build on ‘production’ setting. What else is there to look when faced with these artifacts?
thanks ZacD
I used a radius of 40 and the shadows look better now, though not perfect. The radius blurred the jagged lines and made them appear smooth. some artifacts were there but I imagine they’d disappear with a bigger light radius