AtmosphereObject
From Odwiki
The Atmosphere Object
This is a node available in the Objects Context.
This Object merely holds a reference to an Atmosphere (Fog) Shader. You may have as many of these in the scene as you like. When Mantra or RenderMan renders a fog shader the order that these are executed in is not defined.
Fog shaders can be used for VolumetricRendering.



