Create panel > Helpers > Atmospheric Apparatus (from drop-down list) > BoxGizmo
Tab panels > Helpers tab > Box Gizmo (Atmospheres)
BoxGizmo lets you create a box-shaped gizmo in your scene. Clicking the BoxGizmo button displays the Box Gizmo Parameters rollout.

Box gizmo with volume fog
To add a new atmosphere:
Select the apparatus gizmo.
In the Modify panel, under the Atmospheres rollout, click Add. This displays the Add Atmosphere dialog.
Choose an atmosphere from the list.
Click OK.
This associates a new atmosphere with the apparatus.
To add an existing atmosphere:
Select the apparatus gizmo.
In the Modify panel, under the Atmospheres rollout, click Add. This displays the Add Atmosphere dialog.
In the dialog, choose Existing.
Choose an atmosphere from the list.
Click OK.
This creates a duplicate atmosphere for the apparatus. Its settings are initially identical to the atmosphere you chose. You can adjust them using Setup.
The Name and Color rollout lets you rename objects and change their wireframe color.

Length, Width, and Height—Set the dimensions of the box gizmo.
Seed—Sets a base value used to generate the atmospheric effect. Each apparatus in the scene should have a different seed. If more than one apparatus uses the same seed and same atmospheric effect, they will produce nearly identical results.
New Seed—Click to generate a random number automatically and place it in the seed field.

The Atmospheres rollout, available from the Modify panel, allows you to add and set up atmospheres directly to the gizmo.
Add—Displays the Add Atmosphere dialog from which you can add an atmosphere to the BoxGizmo.
Delete—Deletes a highlighted atmospheric effect.
Setup—Displays the Environment dialog, where you can edit the highlighted effect.
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