[SOLVED] OpenXR Editor lags when I take off Headset

Unity Engine
, , ,
1

Hi guys, I’ve been looking for a solution but I haven’t found it. I am desperate.

I’m developing a windows application with OpenXR: when I take off the Oculus a scene is loaded with a video. The problem is that both in the Editor and in the build there is a huge lag (even if the scene is empty) when the Oculus is not worn.

Run in background is checked.

I have enabled OculusXR Feature and this is the script that allows to recognize if the headset is worn or not:

using UnityEditor;
using UnityEngine;
using UnityEngine.SceneManagement;
using UnityEngine.XR.OpenXR.Features;
#if UNITY_EDITOR
[UnityEditor.XR.OpenXR.Features.OpenXRFeature(UiName = "VR State Tracking",
    BuildTargetGroups = new[] { BuildTargetGroup.WSA, BuildTargetGroup.Standalone, BuildTargetGroup.Android },
    Company = "Your Company",
    Desc = "Tracks state changes.",
    Version = "0.0.1",
    FeatureId = featureId)]
#endif

public class MyOwnXRFeature : OpenXRFeature
{
    public const string featureId = "com.yourcompany.features.statetracking";


    // This is to change a number of state changes in a very granular way:
    protected override void OnSessionStateChange(int oldState, int newState)
    {
        Debug.Log($"OnSessionStateChange: {oldState} -> {newState}");
    }

    // This will happen when headset put on:
    protected override void OnSessionBegin(ulong xrSession)
    {
        Debug.Log($"Feature OnSessionBegin: {xrSession}");
        Debug.Log("Put on");

        SceneManager.LoadScene("Dashboard 2");
    }

    // This will happen when headset taken off:
    protected override void OnSessionEnd(ulong xrSession)
    {
        Debug.Log($"eatureOnSessionEnd: {xrSession}");
        Debug.Log("Put off");

        SceneManager.LoadScene("Videoloop");

    }
}

Is this lag an OpenXR problem?
Because with OVRManager I didn’t have this problem, but the HDMMounted/HDMUnmounted events didn’t work (they only worked in the editor). I can use OVRManager if you know a way to make it works in build.

I use:
Unity 2021.3.0f1
Quest 2 & Quest Pro

Thank you for your time, and sorry for my English!

2

If you have runInBackground checked, it shouldn’t be causing lag when the headset is removed. Could you submit a bug report using a simplified version of your project with this same functionality? Then link the report issue ID in this thread.

3
  1. Update Unity
  2. Update OpenXR to 1.6 (or 1.7)
  3. Update Oculus XR Plugin and/or Oculus Integration

That fixed it for me

4

Thanks for your answers, at the last I fixed my problem with OVRManager.
Long story short: With me HDMMounted/HDMUnmounted event works perfectly only with load a new scene.

For exemple in “Menu” scene, when user takes off headset:

void Start()
    {

        OVRManager.HMDUnmounted += HandleHMDUnmounted;

        void HandleHMDUnmounted()
        {
            SceneManager.LoadScene("screensaverScene");
        }

    }

In “screensaverScene”, when user puts on headset:

    void Start()
    {

        OVRManager.HMDMounted += HandleHMDMounted;

        void HandleHMDMounted()
        {
            SceneManager.LoadScene("Menu");
        }
    }
5

Maybe use application focus instead