Precise mapping instead of dirty

Hey everyone!
Please help me to fix this bag (on the screenshot)
I don’t understand why my shadow is so torn. I want a straight and right lightning. And furthermore it is straight in preview, but when I build my scene it changes to this.
How can I fix it? Changing shadow map resolution doesn’t help

What is the lightmap resolution at in the screenshot?

about 64 :slight_smile:

Try 256 or higher. 64 is way too low for a mesh that large if you want precise shadows.