I have some problem wih the shadows… i’ve tried many things, like some basics things for exemple (increase lightmap resolution).
But nothing works, it’s seems that in a certain angle, this mesh don’t work fine with shadows and i don’t know why at all !
I’ve had those concentric lines before too. There isn’t merely one fix for it, as it depends on the lighting setup, while also requiring a different fix for different types of lights (directional, skylight, point, spot, rect). One thing it could be for point / spot lights is to check whether the source radius is intersecting geometry on other sides that are not meant to receive its lighting on those sides. So, if there’s a wall and the point light is on the inside of the wall (so inside of the building), and there’s a gap from the wall to the next wall…then if the point light’s source radius extends past the outside of the wall, it is going to cast light on the wall’s outside area. Not sure if it’s the issue in your problem, but was speculating it could be causing the lines / artifacts. I was thinking it could be carrying over partially rendered lighting to the wall’s outside area if it’s extending from one side of it to the other.
What are the mesh’s Build settings in the mesh editor of UE?