Defines the amount of particles in the air. The higher the density, the more particles and the more in-game objects/terrain will be obscured by them. Note that density does not directly affect the skybox — it merely affects in-game objects/terrain and visibility of the skybox through them.
articles/Atmosphere|Atmosphere Controls article for property comparisons and example environments.
articles/Custom Skyboxes|Custom Skyboxes, outlines how to change the default skybox for games and customize the lighting
articles/Post Processing Effects|Post-Processing Effects, outlines how post-processing effects can quickly improve a game’s visuals with a variety of customizable filters