CallbackPositionCallback
typealias CallbackPositionCallback = (time: JulianDate?, result: Cartesian3?) -> Cartesian3?(source)
A function that returns the value of the position property.
Parameters
time
The time for which to retrieve the value. If omitted, the current system time is used. Default value - JulianDate.now()
result
The object to store the value into. If omitted, the function must create and return a new instance.