You can create three types of atmospheric apparatuses, or gizmos: box, cylinder, and sphere. These gizmos contain the fog or fire effect in your scene.
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Create panel > 
(Helpers) > Atmospheric Apparatus (from drop-down list)
You can create three types of atmospheric apparatuses, or gizmos: box, cylinder, and sphere. These gizmos contain the fog or fire effect in your scene.
Create panel > (Helpers) > Atmospheric Apparatus (from drop-down list)