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.