Completely disable position tracking

Hi everyone

I am doing a psychological research that requires me to present the visual stimulus on both Oculus Rift and HTC Vive. I am using Unity to build to experiment program, but to avoid any confounding, I have to disable position tracking.
What I mean is that I am trying to treat the headset as a simple 3D display (pretend that I stick two images in front of it) that no head movement will be tracked (the position and rotation of the camera will always be 0,0,0).
Could someone point me to which script I should modify to achieve this goal?

Thanks a lot.

 

It works, thanks a lot for the help.
I am now facing another issue. Since I am going to generate the stimulus at a specific location (i.e. (0, 0, 50f)) when a key is pressed, but it seems that it the stimulus will be created based on (0,0,0) in the scene, which it appears off the center (and I can see that it tilts when I move my head).
Is there a way for me to keep the stimulus at the center of the screen? (maybe constantly update the position of the stimulus?)

Thanks a lot for the help

 

Hi Nick,

The solution above does away with the positional tracking but also with the neck modeling. (offset from your neck to your eyes) there is no parallax anymore when rotating your head. Would be good if we could access something in VRSettings to turn off tracking but still get some head modeling on the camera.

thoughts on an intermediate solution?

T

 

Code (CSharp):

1. UnityEngine.VR.InputTracking.disablePositionalTracking = true;

 

Hi Nick, I happen do be working on something very similar to Cozywolf's project, and I was trying to get the soultion you gave to work, with no success. What exactly do you mean by "Be sure to zero out both transforms"? Any help would be appreciated.

 

in 2017.2 you can now use the Tracked Pose Driver to apply only the rotation of a given pose. (or none at all by disabling the component).

in revisions before 2017.2, using UnityEngine.VR.InputTracking.disablePositionalTracking = true; will stop position deltas being applied to the current "main" camera.

 

Ok, I upgraded to 2017.2 and tried disabling the Tracked Pose Driver, but whenever I build and run the project it still keeps tracking the head position, is there any more specific info such as what object the script should be attached to or how to get the correct Tracked Pose Driver?

Thanks!

 

When doing that, and disabling the TPD - The camera still seems to move (up and down) with a slight jitter. Do you have any idea why?

 

Hi. I am trying to disable the head rotation tracking. I came across this thread and tried adding the Tracked Pose Driver component to my camera and disabling it, but that does not prevent HMD pose from setting the camera rotation. Is that possible in any way? I also tried doing transform.rotation = Quaternion.identity; in LateUpdate() and in PreRender(), but still the HMD pose overrides whatever I try to set as the rotation. Is this because under the hood Unity sets the rotation based on the HMD pose after PreRender is executed? Is there any way to prevent this?

Im thinking maybe the rotation setting is prevented so that devs would never be able to take control over the camera rotation and therefore create a VR vomit generator 3000? =)

I know it is unusual to force the camera rotation in a VR app, but it is necessary in my case - I am developing sort of a test application where in one mode I would need to ignore the real HMD pose and artificially set the camera rotation (and position)).

 

Hey all,

I need to disable VR position tracking, but keep rotation tracking, I'm using Unity 2018.2.11f1, will any of these solutions work for this version of Unity? Would you mind explaining how to do it?

Thank you!!
Claudia

 

using UnityEngine;
using UnityEngine.XR;

public class Trackingoff : MonoBehaviour
{
void Update()
{
transform.position = -InputTracking.GetLocalPosition(XRNode.CenterEye);
//transform.rotation = Quaternion.Inverse(InputTracking.GetLocalRotation(XRNode.CenterEye));
}
}

 

Hi, just a little update on the code to work with Unity 2018 . I,m making 360 still images with 3d object added. Its handy to use the vive to test things on the go.

 

Thank you, I have tried this, but unfortunately it doesn't work - my camera still jumps up into the air by several feet

 

Now it is UnityEngine.XR.InputTracking.disablePositionalTracking = true;

 

I'm attempting the same thing as the people above. I've used:

Code (CSharp):

1.  UnityEngine.XR.InputTracking.disablePositionalTracking = true;

and also attached a Tracked Pose Driver to all three cameras in the OVRCameraRig (LeftEyeAnchor, CenterEyeAnchor, RightEyeAnchor). So far, nothing disables the position tracking. I'm trying to get this working on an HTC Vive with 2018.2.10f1. Any suggestions?

 

Hi, I have disabled for oculus quest.On OVRCameraRig prefab the OVRManager component has attached. OVRManager has provided UsePositionTracking properties. so you have to uncheck that.
simple.

 

It will reset the local rotation to 0,0,0.Is there a way to disable the tracking without resetting and have a the local rotation of the last frame

 

Code (CSharp):

1.         public void SetTrackerActive( bool active )
2.         {
3.             StartCoroutine( DisableTracker( !active ) );
4.         }
5.  
6.         private IEnumerator DisableTracker( bool disable )
7.         {
8.             XRDevice.DisableAutoXRCameraTracking( ActiveCamera, disable );
9.             yield return null;
10.  
11.             ActiveCamera.gameObject.SetActive( false );
12.             yield return null;
13.  
14.             ActiveCamera.gameObject.SetActive( true );
15.         }
16.  

 

none is working in Unity 2019.2 for HTC Vive

 

bump

 

I'm trying to simply create a mini-map for my VR game and the camera keeps getting over written, ive found the GVR cardboard emulator script has a for loop to attach itself to any and every dern camera, so even with this...

using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.VR;

public class disabletracking : MonoBehaviour
{
void Update()
{
UnityEngine.XR.InputTracking.disablePositionalTracking = true;

}
}

it still overrides my mini-map cam ive tried EVERYTHING, what am i missing?? I dont get any errors it just doesnt do what its being told (((

 

@StayTalm_Unity
Hi,

I am also doing some academic research in nuerophysiology when hampering the tracking.
XRDevice.DisableAutoXRCameraTracking works
and actually getting the tracking nodes to do my own tracking also works with the Unity 2018.3.2 TPD and Overriden BasePoseProvider.TryGetPoseFromProvider(EDIT* Verified also with a new 2019.3.9 Project with the XR legacy helpers)

But changing the BasePoseProvider to return something different that expected gives jitters.
Actually returning Pose.identity, that should have resulted in a frozen picture gives jitters when the Head is moving. stays put but jitters on movement.


my goal:
Pseudo code:
InputTracking.GetNodeStates(nodes)
foreach (XRNodeState x in nodes)
{
if (x.nodeType == XRNode.CenterEye)
{

Quaternion q;
if (x.TryGetRotation(out q))
{
pose.transform.localRotation = Quaternion.Slerp(pose.transform.localRotation, q,delay);


when delay is 1 everything is working.
when delay is 0 it stays put but jitters.
actually my main goal is the range between which appears great regarding delay manipulation except the jitters.
The view in the PC monitor is perfect.

It seems that there is something else that does further prediction which is not disabled.

Thanks In advance
(Using Vive with SteamVR)

 

Both types of reprojection are disabled on my machine; in fact, they can't *be* enabled on my headset (Quest via Virtual Desktop). But I'm still getting this jitter when I have a Tracked Pose Driver attached to my Main Camera. The only way to solve it is to *not* use the Tracked Pose Driver. XRDevice.DisableAutoXRCameraTracking(camera,true) did nothing to solve the problem.

There is clearly a bug here. Tested on OpenVR. Unity version 2019.3.15f1 using the new Input System.

 

Further info: the bug only occurs using the new Input System Tracked Pose Driver. The one in the Legacy XR Input System does *not* have the problem. Again, this is on unity version 2019.3.15f1, tested on OpenVR.

I've created a repository that exhibits the bug, it is the most basic example I could make; just look at the horizon and move your head around and you'll see a jitter. If you remove the Tracked Pose Driver, the jitter goes away and the horizon is stable when moving your head.

https://github.com/PushyPixels/UnityVRTrackedPoseBug

 

I have the same issues looks like XR is messing with any cameras projection matrix, I wrote a small script that clearly shows this.

 

Hi guys, my solution is to set original cameras false, create new one, and use code below in Start():

Code (CSharp):

1. UnityEngine.XR.InputTracking.disablePositionalTracking = true;

(FirstAnchor is a copy of CenterEyeAnchor)
BTW, DO NOT uncheck these 2 options(Use Position Tracking; Use IPD in Position Tracking) in OVR Manager, or the display in HMD will go wrong.
Then you shall have a fixed Head Camera and tracked hands

 

https://docs.unity3d.com/ScriptReference/Camera-stereoTargetEye.html

set this to StereoTargetEyeMask.None

on the camera you want to disable tracking.

 

Hello everyone, I've trying the different alternatives here with no much luck.
What I'm trying to do is avoiding the user movement (not the head tracking/rotation). I.e.: if the user takes a step, avoid that movement.
I'm Using Unity 2020.1.9f1 + Oculus Quest 2.
Any idea?

 

Hello everyone,

I'm working on a physiology experiment where I still need the head tracking data to change the camera position, just not 1-to-1.

I'm using DisableAutoXRCameraTracking in Start() as mentioned above, with 2019.4 / LTS. That works. Thanks @StayTalm_Unity
This allows me to still read the HMD coordinates, and move the camera myself.
But it's a little jumpy, any ideas?

Ex:

public Camera childCamera;



UnityEngine.XR.InputDevice ViveHDM;

UnityEngine.Vector3 ViveHMDVelocity;



void Awake()

{

XRDevice.DisableAutoXRCameraTracking(childCamera,true)

}



void Start()

{

ViveHMD = findVive(); //my own function, it works

}



void Update()

{

ViveHMD.TryGetFeatureValue(UnityEngine.XR.CommonUsages.centerEyeVelocity, out ViveHMDVelocity);



//Now move the camera yourself, but it's not smooth. Why?

transform.Rotate(RotateAmount * Time.deltaTime);

}

P.S.
I liked the negating tracking idea (from @NickAtUnity) of the parent object but had to change the code for the math to work out, but it was flickering. I don't really know how the HMD data and the Camera movement data is connected, but if someone knows, this would work:
transform.rotation = Quaternion.Inverse(ViveHMDRotation);
transform.position = -(transform.rotation * ViveHMDPosition);

 

Hey everyone,

I'm also looking to disable the positional tracking for the Oculus Rift S Headset. I'm using Unity 2020.3.4f1 and the Oculus Integration Asset version 27.0 which is the latest.

I tried almost all the posted solution above and none of them is working. My scene just contain the OVRCameraRig prefab from the oculus integration asset and a 3D cube.

The things I tried :

- Disabling the "Use Position Tracking" checkbox of the OVRManager but this cause huge rendering issue.
- Calling XRDevice.DisableAutoXRCameraTracking(centerCam, true) that did literally nothing, even with the trick of disabling and re-enabling the camera posted by @tgaldi
- Setting StereoTargetEyeMask to None on the centerCam as suggested by @Aksotroth
- Tried to call UnityEngine.XR.InputTracking.disablePositionalTracking = true; but this is deprecated in my unity version, and it did nothing.
​

There is only 1 way I managed to make it work is by editing the OVRCameraRig script of the oculus integration asset, on the line 182 in the UpdateAnchors function, I changed this :
centerEyeAnchor.localPosition = centerEyePosition;
to this :
centerEyeAnchor.localPosition = Vector3.zero;

Then the rotational tracking was working, but the positional tracking was disabled.
I don't like this way at all because I have to change things in the oculus integration asset, so if anyone has a better way of doing it, please tell me !

I guess the issue is not coming from Unity but from Oculus, they need to update their script to allow such a simple option.

 

jolanbar thank you for your tip! I used this approach to turn off rotational tracking, by replacing this row:

centerEyeAnchor.localRotation = centerEyeRotation;

to this:

centerEyeAnchor.localRotation = new Quaternion(0f, 0f, 0f, 0f);

in OVRCameraRig script.
By the way, "Use position tracking" checkbox works fine for me in OVRManager.

BTW, in OVRManager.cs you can find this code:

[HideInInspector]

public bool useRotationTracking = true;

By commenting the first row [HideInInspector] you can see this checkbox in OVRManager, but turning this off gets a lot of issues to me.

So your solution was the only working way for me. Thanx!

 

I am using the XR interaction toolkit (2.2.0). I want to disable the headset position movement but still want the controller to behave properly. Currently, my headset is working fine but my controller has a vertical offset from the actual controller.
Because the offset controller appears above my head in VR.

My setup :
- XR Origin
- Main Camera with Tracked Pose Driver, the tracking type is set to Rotation only.
- On the main camera, I also have a script with DisableAutoXRCameraTracking in the Start.

How can I fix this?

 

The controllers doesn't use the Headset as their origin, but an interpolation of the "world" calculated by the headset. so, when you set the headset to Rotation Only, it basically freeze the headset position, but the controllers are still updating from the 3D real world. (The center of that interpolated world is kinda vague as it depends on how the headset is set.)

The following method works if you work with the XR setup with Action-based controllers.

I think your best bet if you go with the Rotation only tracking method:
1) Turn off the the check mark of the "Position Action" on your controllers game object's XR Controller script.
This will turn off the default world's based tracking of the controller.

2) Write a new script that will be placed on each controller.
You got to create a reference, in that script, to the VR camera. (Camera.Main should work if you use the default VR camera.) You can get your controllers' position from the "XRI Default Input Actions". If you unsure how to set it up, open the "ActionBasedController.cs" script (it's the one which move your in-game controllers). There's a bit of workaround, but the process is relatively straight forward. The only problem with reading that file is that it covers so many things, you got to know how to trim the information.

Still, you should be able (if you know what you're doing) to extract the bits of codes that allows you to get the position from the "XRI Default Input Actions" which gives you the real-world Vector3 position of a controller from the headset perspective.

3) Before applying the the position to the controllers in-game transform, calculate the relative position between the Vector3 position of each controller and the headset Vector3 position (all in real-world by looking up the "XRI Default Input Actions" which read and store the position and rotation detected by the device.). After, this should allow you to apply the position based on the headset position and not the real world position for each individual controller.

 

Thanks!