Meta XR Simulator Multiplayer

1. Start a Synthetic Environment Server and keep it running in the background (see Getting Started with Meta XR Simulator for detailed instructions).
2. Launch multiple simulator instances at the same time. The following approaches are recommended:
   • Option 1: Configure multiple PIE (Play In Editor) clients. In Editor Preferences > Level Editor > Play > Multiplayer Options, set Run Under One Process to False and HMD For Primary Process Only to False. Set Play Number of Clients to the desired number of players, then launch VR Preview.
   • Option 2: Package your project for Windows via File > Package Project, and set the system’s active OpenXR runtime to Meta XR Simulator:
     • In Windows Registry Editor, navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenXR\1 and create a field named “ActiveRuntime” with type REG_SZ.
     • Find meta_openxr_simulator.json under your project folder, and set the registry value to /path/to/meta_openxr_simulator.json.
     • Then, you can run your game in the simulator from outside of the Unreal Editor.
3. Coordinate the input for all players.
   • Option 1: Provide input to each simulator manually, one by one.
   • Option 2: Use the Record and Replay functionality (see Meta XR Simulator Session Capture for more details) for simultaneous action playback.