Question rig position very high in virtual desktop

it seems when I play my build on Quest 2 through the "Virtual Desktop" app, my rig is like 10 units higher than when i play via oculus link. Anyone familiar with the issue? i am using XR Interaction toolkit with OpenXR, on an Oculus Quest 2 device.

 

Try making a script that manually sets the starting Y position you wish to use when booting up your game, no matter which device / mode is being used.

 

yea i might just do that, thought maybe it was a known issue with a out of the box solution. just wondering, is that what you do? have a script for forcing the position? also did you experience what i mentioned on virtual desktop (and not on regular oculus link)?

 

Without haven't seen your issue in a video, I think I experienced the same fault a few days ago aswell. Whenever I was in "Oculus mode" and went back to play my game after I woke the headset again I would appear higher up than what I did when I took my headset off. Annoying bug

 

thanks, ill try to get a video up here at some point when i use virtual desktop again(at least for future people stumbling on this post).
One last question, I wrote a script to set the xr rig position as you suggested, and it works perfectly. Only issue i have is detecting when to call my EnsureXRRigIsProperlyPositioned() function. about 80% of the time, caling it on start does the job, but the other 20% it looks like some preconditions weren't met (like xr input or runtime related things). is there an event i could hook into? i spent hours looking and came up with nothing. i see that the xr rig's camera's position is constant for a couple of frames sometimes before it seems to jump into place. I tried different origin trackings as well.. no help

 

One solution on the top of my head would be to check if the user is wearing the headset or not. And fire an event once the user puts on the headset and the sensor ticks (or some other feature that the headsets use to see if the user has it on or not)

This page might help : https://docs.unity3d.com/ScriptReference/XR.CommonUsages-userPresence.html

 

Thank you, really appreciate it!

 

here is my solution for anyone stumbling on this thread. I initially relied on triggerring events based on user presence, but im not sure i need it, so its commented out. I found that i just need to trigger my ResetRigOrientation() logic one frame after i instantiate the XRRig. Also, if your use case is similar to mine, you dont really need to reference the userPresence at all. if you do use it, the input action reference is from the XR interaction toolkit samples hmd/UserPresence and you should tick the checkbox there for "Initial state check".

the code could be simplified i know, like the "eyes" field could be xrRig.cameraGameObject.transform, and the action.canceled event hooks are probably not necesary.

Code (CSharp):

1. using System;
2. using System.Collections;
3. using System.Collections.Generic;
4. using UnityEngine;
5. using UnityEngine.InputSystem;
6. using UnityEngine.XR.Interaction.Toolkit;
7.  
8. //resets the position and rotation (about xr rigs local up axis) of the xr rig
9. //such that {eyes} (the camera) is at relHeadPos in this's local space
10. //and eye's forward is in this's local yz plane
11. public class ResetRigOnPresence : MonoBehaviour
12. {
13.     [SerializeField] XRRig xRRig;
14.     [SerializeField] Transform eyes;//the camera of the rig.
15.     [SerializeField] Vector3 relHeadPos;//desired position of the rigs camera in this's local space
16.     // [SerializeField] InputActionReference presenceIAR;
17.  
18.     private void Start() {
19.         StartCoroutine(ResetWhenPresent());
20.     }
21.  
22.     IEnumerator ResetWhenPresent(){
23.         // while(presenceIAR.action.ReadValue<float>() < 0.5f){
24.         //     yield return WaitCache.waitForEndOfFrame;
25.         // }
26.         yield return WaitCache.waitForEndOfFrame;
27.         ResetRigOrientation();
28.     }
29.  
30.     void OnEnable()
31.     {
32.         // presenceIAR.action.started += HandlePresenceChange;
33.         // presenceIAR.action.canceled += HandlePresenceChange;
34.     }
35.  
36.     void OnDisable()
37.     {
38.         // presenceIAR.action.started -= HandlePresenceChange;
39.         // presenceIAR.action.canceled -= HandlePresenceChange;
40.     }
41.  
42.     // private void HandlePresenceChange(InputAction.CallbackContext obj)
43.     // {
44.     //     bool isPresent = obj.ReadValueAsButton();
45.     //     if(isPresent) ResetRigOrientation();
46.     // }
47.     public void ResetRigOrientation(){
48.         Vector3 desiredHeadPos = this.transform.TransformPoint(relHeadPos);
49.         Vector3 currHeadPos = eyes.transform.position;
50.         Vector3 delta = desiredHeadPos - currHeadPos;
51.         xRRig.transform.position += delta;
52.        
53.         Vector3 eyesFlatForward = Vector3.ProjectOnPlane(eyes.forward, this.transform.up);
54.         float angleOffset = Vector3.SignedAngle(eyesFlatForward, this.transform.forward, this.transform.up);
55.         xRRig.transform.Rotate(0f, angleOffset, 0f, Space.Self);
56.     }
57. }