Environment

 

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_volumeFog 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. 

It is not possible to render both fog and atmosphere_volume in the same scene.

 

You can choose None (no atmospheric effects), fog, or atmosphere_volume. If you select fog or atmosphere_volume, the Attribute Editor will display the controls for each node.

The aiFog and aiAtmosphereVolume nodes can also be found in the Outliner by switching to 'Show Dag Objects Only':

fog and atmosphere_volume selected in the Outliner (Show Dag Objects Only).

Background

Use this setting to create a Background shader. Click and hold on the create button  to create an Environment shader.

Background is considered deprecated and will be removed in a future release.

 

 

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