These settings provide control over the background and atmosphere (fog or volume scattering).
Use this field to define a 'Background' shader for the scene. Create a shader (eg. Sky, Physical Sky or Ray Switch shader) and drag and drop it onto the 'Background' shader slot. Once connected you can double click the shader ball icon to the right of the slot, in order to select the shader and show its parameters in the attribute manager.
Background is considered deprecated and will be removed in a future release.
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. Volumetric Scattering simulates light scattered by a thin, uniform atmosphere. It produces shafts of light and volumetric shadows cast from geometric objects.
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It is not possible to render both fog and volume scattering in the same scene.