lightmass blotches

Dear all

I am getting blotchy shadows using lightmass screen shots:

Whats causing them ?



Maybe we’ll need more info than that…
Which lighmass are you using (CPU or GPU)? …is your lightmass compression turned on? /if so turn it off, it can cause this kind of artifacts…/
Could you post your lightmass settings please and your lightmap uv resolution of these walls? …also what lights are you using in the scene?

It was lightmass compression ! thankyou