OptionalcameraThe camera defines the position, tilt, and heading of the point from which the SceneView's visible extent is observed.
OptionalrotationThe rotation of due north in relation to the top of the view in degrees.
OptionalscaleThe scale of the viewpoint.
OptionaltargetThe target geometry framed by the viewpoint.
Describes a point of view for a 2D or 3D view. In a 2D view, the viewpoint is determined using a center point and scale value. In a 3D view, it is determined using a camera position. The Viewpoint can be bookmarked for later use, or used for navigation purposes.
See https://developers.arcgis.com/web-map-specification/objects/viewpoint/ https://developers.arcgis.com/web-scene-specification/objects/viewpoint/.