Why does the stationary skylight produce artifacting/banding?

Hello,

We have noticed that the stationary sky light produces very different results (in terms of quality) from the static skylight and we would like to know if there’s a way to fix this.
We have been able to reproduce this problem also in UE 4.15, 4.14, 4.13.
We used default lightmass settings for this test.
Lightmap compression is turned off for the test.

The scene contains one skylight, and one sky sphere.
Geometry is BSP (same results with static meshes) with Lightmap res set to 1.
Thank you,

Mircea

Shame that you got no respnses, I have ths ame issue a year later :confused: