OptionalatmosphereWhether the atmosphere should be visualized. This includes sky and haze effects.
OptionalbackgroundSpecifies how the background of the scene (which lies behind sky, stars and atmosphere) should be displayed.
OptionallightingObject containing information on how the scene is lit.
OptionalstarsWhether stars should be displayed in the sky.
OptionalweatherIndicates the type of weather visualization in the scene.
Represents settings that affect the environment in which the WebScene is displayed (such as lighting). It is part of the initial state of the WebScene as well as slides in the presentation.
See https://developers.arcgis.com/web-scene-specification/objects/environment/.