Simple-time

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Simple-time tries to ensure that FlightGear multiplayer sessions see a consistent and smoothly-varying view of each other, regardless of frame rates or network delays.

For example in multiplayer refueling, each pilot will see the same relative position of the two aircraft.

Currently (August 2024) this is only available on the development version of FlightGear.

Using simple-time

Simple-time is enabled in the "Time Mode" dialogue from menu File/Time Mode, or from the command line with: --prop:bool:/sim/time/simple-time/enabled=true.

There are no configuration settings.

Technical details

Simple-time works by putting the UTC time of the host system in MP packets and recordings, and using extrapolation to position MP aircraft using information that is necessarily always slightly out of date.

Related content

Wiki articles

  • Real Time manual - A more customizable system that addresses some of the same issues.

Readme file

Source code