A lot of free space on ligtmap

Hello,
I have question about creating lighmap. I baked lighmap of objects in my project. Why i have a lot of free space in it? Is it possible to use all free space of maps?

I think you can do this either by reducing your atlas size or increasing your lightmap’s resolution. This way your objects should fill more of the space.

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the UT said they will optimize lightmap atlasing in 5.2

Thank you! atlas size worked perfectly:)