The Add Atmosphere dialog lets you associate an atmosphere with the Atmospheric Apparatus.
Interface

- [list of atmospheres]
-
Displays the atmospheres that you can associate with the apparatus.
[display group]
Always set to Atmosphere.
[new or existing group]
These radio buttons choose between new or existing atmospheres.
- New Lists only new atmospheres.
- Existing Lists only atmospheres that have been already assigned to other apparatuses in the scene.
Adding an existing atmosphere creates a new atmosphere whose settings are initially identical to the previous one.