Environment - Arnold User Guide
These settings provide control over the background and atmosphere (Fog or Atmosphere_Volume).
Atmosphere
There are two types of atmosphere in Arnold, Fog, and Atmosphere Volume. Fog simulates the effect of light scattering, which causes more distant objects to appear lower in contrast, especially in outdoor environments. Atmosphere Volume simulates light scattered by a thin, uniform atmosphere. It produces shafts of light and volumetric shadows cast from geometric objects.
Note:
It is not possible to render both Fog and Atmosphere Volume in the same scene.
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| fog used for under water effect | atmosphere volume used to simulate rays of sunlight |
Background
Use this setting to create a Background shader.
Important:
Background is considered deprecated and will be removed in a future release.