Question Enable/Disable VR at runtime using OpenXR

I'm using XR Plugin Management 4.2.1 and OpenXR 1.5.3 on Unity 2020.3.39f1.
I'm using only OpenXRLoader, that's why i'm using index 0.

Code (CSharp):

1.  
2.         if (m_SelectedXRLoader == null)
3.         {
4.             m_SelectedXRLoader = XRGeneralSettings.Instance.Manager.activeLoaders[0];
5.         }
6.  
7.         var initSuccess = m_SelectedXRLoader.Initialize();
8.         if (!initSuccess)
9.         {
10.             Debug.LogWarning("Error initializing selected loader.");
11.         }
12.  

When i call the Initialize(), if my device is not connected i got the warning as i want, but also a log from
OpenXRRestarter saying "Please make sure the device is connected. Will try to restart xr periodically".
Then a loop starts giving always same error:

Code (CSharp):

1. Failure to restart OpenXRLoader after shutdown.
2. UnityEngine.SetupCoroutine:InvokeMoveNext (System.Collections.IEnumerator,intptr)

Is there a way to avoid this loop?
Thank you.

 

This error will loop as long as no HMD is active.
As far as I know there is no easy way around it, unless you dig into the source code.
You can file a bug report for it, since for usecases like you this loop can be very annoying

 

yeah this began with the previous version of unity and it is annoying because it does a CPU spike on your game every 5 seconds

 

Maybe disable 'enable xr on startup' and only enable it when you want to start VR?

 

That's what we are doing, so is not a solution, the issue occuring everytime we try to start vr service while the device is not connected. If we set "enable xr on startup" to true, the loop starts when the app starts.

 

I've written a small workaround for the issue while waiting for a proper fix being release. The bug report I wrote was marked as a duplicate unfortunately so who knows the status of it.

Simply drop this class into an editor script folder of your choice:
https://gist.github.com/Kroporo/f7201d7c9ce6dd015a461992c62cb946

You'll need to modify how it hooks if you want this behavior in a build, but it works fine in the editor.
I also fully expect this script to break with updates to OpenXR, but then we hopefully won't need it anymore.
Tested with Unity 2021.3.13f1

 

1.6 also will have this fixed!
Got a reply from the QA team

 

any mention on when 1.6 will be out? this CPU spike is pretty annoying

 

Sadly not. I asked but no reply yet

 

Having the same issue but I found that you can revert back to OpenXR 1.4.2 to solve this issue.

Just close your project and go to "Packages" folder and edit both manifest and packages-lock file to change version of OpenXR plugin back to 1.4.2.

 

1.6 was not listed in the package manager so I manually changed the version in the manifest, and the errors disappeared indeed. Dynamically loading the XR seems to be finally working (no headset to test at the moment but at least not crashing anymore)

 

same here, the update doesn't show up, i had to manually modify the manifest