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Help : How to improve shadow quality ?

Hi I am new to this.
This is picture from viewport before building light process.
111.png
and this is picture after building light process.
222.png

I try with this parameter.
333.png

How I make this look the same? Any suggestion?

Thank you very much

Hi!

Read this, i think it help

Your lightmap resolution is too low. It also looks like your lightmap UV’s are not very good, since the curtain is essentially a plane, it should be able to be mapped that way so that there aren’t so many seams.