Sky Atmosphere is the new Atmospheric Fog, has most/all of its settings + more. Exponential Height Fog is utilized for things like light rays, volumetric fog, a thicker / more flexibly adaptable ground fog, and other things. Sky Atmosphere is for atmospheric scattering simulation to get different skies, atmosphere effects like haziness, and simulating pollution. The SunSky actor comes with a Sky Atmosphere that is connected to time-of-day functionality.
4 Likes