According to the freedicitionary.com by Farlex ambiance refers to "a particular environment or surrounding influence." Directors intentionally create atmosphere.
In all types of theatre directors intentionally create the environment by artificially constructing the performance space or using what occurs naturally in creative ways.
Directors and Set Designers both create space and make clever use of the performance area available to the cast….
The style of theatre affects the level of intimacy that can be achieved.
Stages may be
Ambiance is partly dictated by the level of resources the director has access to but is also dependant on the kind of space available for the production.