toggle between 2d and Google Cardboard (2020 Unity XR)

ToggleGoogleVROnOff.cs

https://forum.unity.com/threads/toggle-between-2d-and-google-cardboard.902378/#post-6959573

Coroutine StartVR()
{
    return StartCoroutine(startVRRoutine());
    IEnumerator startVRRoutine()
    {
        // Add error handlers for both Instance and Manager
        var xrManager = XRGeneralSettings.Instance.Manager;
        if (!xrManager.isInitializationComplete)
            yield return xrManager.InitializeLoader();
        if (xrManager.activeLoader != null)
            xrManager.StartSubsystems();
        // Add else with error handling
    }
}


void StopXR()
{
  var xrManager = XRGeneralSettings.Instance.Manager;
  if (!xrManager.isInitializationComplete)
    return; // Safety check
  xrManager.StopSubsystems();
  xrManager.DeinitializeLoader();
}

// And perhaps this too, if you are experiencig a distorted or stretched screen after exiting VR:
camera.ResetAspect();
camera.fieldOfView = defaultFov;
camera.ResetProjectionMatrix();
camera.ResetWorldToCameraMatrix();

tips googlevr/cardboard#140