Build lighting quality ?

I’d like to know why the shadows of the directional light get distorted when I build the lighting. I’ve tried even the “production lighting quality” but it still turns out jagged.
When I import the fbx object and place it in the scene, the shadows are somewhat ok, but when I build the project they turn all distorted.

Here are some screenshots.
Any help would be welcomed :slight_smile:

You need to increase the lightmap resolution of the floor. More info here:

Thank you Jacky