The following attributes allow you to control the contribution that the atmosphere makes to different types of rays in Arnold - camera rays, diffuse GI rays, and reflection rays.

Affect Camera

Controls the degree to which the atmosphere_volume affects camera rays.

Affect Diffuse

Controls the degree to which atmosphere_volume affects GI_diffuse_rays. 

Thin volumetric spotlight with a small cone angle

Care should be used when enabling these settings. Non-zero values means slower renders because the GI rays now need to also do volume calculations, and most of the time this effect is subtle and not worth the extra effort.

Affect Reflection

Controls the degree to which atmosphere volume affects specular rays.

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