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Question [SOLVED] OpenXR Editor lags when I take off Headset

Discussion in 'VR' started by unity_keywe, Mar 29, 2023.

  1. unity_keywe

    unity_keywe

    Joined:
    Dec 9, 2019
    Posts:
    2
    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:

    Code (CSharp):
    1. using UnityEditor;
    2. using UnityEngine;
    3. using UnityEngine.SceneManagement;
    4. using UnityEngine.XR.OpenXR.Features;
    5. #if UNITY_EDITOR
    6. [UnityEditor.XR.OpenXR.Features.OpenXRFeature(UiName = "VR State Tracking",
    7.     BuildTargetGroups = new[] { BuildTargetGroup.WSA, BuildTargetGroup.Standalone, BuildTargetGroup.Android },
    8.     Company = "Your Company",
    9.     Desc = "Tracks state changes.",
    10.     Version = "0.0.1",
    11.     FeatureId = featureId)]
    12. #endif
    13.  
    14. public class MyOwnXRFeature : OpenXRFeature
    15. {
    16.     public const string featureId = "com.yourcompany.features.statetracking";
    17.  
    18.  
    19.     // This is to change a number of state changes in a very granular way:
    20.     protected override void OnSessionStateChange(int oldState, int newState)
    21.     {
    22.         Debug.Log($"OnSessionStateChange: {oldState} -> {newState}");
    23.     }
    24.  
    25.     // This will happen when headset put on:
    26.     protected override void OnSessionBegin(ulong xrSession)
    27.     {
    28.         Debug.Log($"Feature OnSessionBegin: {xrSession}");
    29.         Debug.Log("Put on");
    30.  
    31.         SceneManager.LoadScene("Dashboard 2");
    32.     }
    33.  
    34.     // This will happen when headset taken off:
    35.     protected override void OnSessionEnd(ulong xrSession)
    36.     {
    37.         Debug.Log($"eatureOnSessionEnd: {xrSession}");
    38.         Debug.Log("Put off");
    39.  
    40.         SceneManager.LoadScene("Videoloop");
    41.  
    42.     }
    43. }

    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. EdBlais

    EdBlais

    Unity Technologies

    Joined:
    Nov 18, 2013
    Posts:
    311
    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. DevDunk

    DevDunk

    Joined:
    Feb 13, 2020
    Posts:
    5,136
    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. unity_keywe

    unity_keywe

    Joined:
    Dec 9, 2019
    Posts:
    2
    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:
    Code (CSharp):
    1. void Start()
    2.     {
    3.  
    4.         OVRManager.HMDUnmounted += HandleHMDUnmounted;
    5.  
    6.         void HandleHMDUnmounted()
    7.         {
    8.             SceneManager.LoadScene("screensaverScene");
    9.         }
    10.  
    11.     }
    In "screensaverScene", when user puts on headset:

    Code (CSharp):
    1.     void Start()
    2.     {
    3.  
    4.         OVRManager.HMDMounted += HandleHMDMounted;
    5.  
    6.         void HandleHMDMounted()
    7.         {
    8.             SceneManager.LoadScene("Menu");
    9.         }
    10.     }
     
  5. DevDunk

    DevDunk

    Joined:
    Feb 13, 2020
    Posts:
    5,136
    Maybe use application focus instead