# ML2 Controller Loses Tracking

**URL:** <https://forum.magicleap.cloud/t/ml2-controller-loses-tracking/7060>\
**Category:** Unity Development\
**Tags:** development, unity, openxr\
**Created:** [June 18, 2026, 6:41pm UTC](https://forum.magicleap.cloud/t/ml2-controller-loses-tracking/7060 "2026-06-18T18:41:05Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![jose.rocha](https://avatars.discourse-cdn.com/v4/letter/j/b3f665/32.png) [@jose.rocha](https://forum.magicleap.cloud/u/jose.rocha)\
**Post date:** [June 18, 2026, 6:41pm UTC](https://forum.magicleap.cloud/t/ml2-controller-loses-tracking/7060/1 "2026-06-18T18:41:05Z")

</div>

Hi.

I just noticed that ML2 Controller, in my app, loses tracking when the IR lights are not visible by the headset.

I know that the controller can do SLAM and i can see it working, for example, in the device Settings app. In this app, i put the controller behind my head, and the Pointer Ray still follows the controller movements.  
This behaviour does not work in my unity 2022 latest LTS app (MRTK3 + XRI).  
I’m not sure if this is related to the SO version, i’m not on the latest.

Any tips?

---

<div class="post-metadata">

**Author:** ![jspire](https://avatars.discourse-cdn.com/v4/letter/j/8dc957/32.png) [@jspire](https://forum.magicleap.cloud/u/jspire)\
**Post date:** [June 22, 2026, 10:28pm UTC](https://forum.magicleap.cloud/t/ml2-controller-loses-tracking/7060/2 "2026-06-22T22:28:51Z")

</div>

Hi Jose,

How long is it behind your head/out of the sensor view? I believe the ML2 can only maintain accurate tracking for a short time while it’s out of the sensor FOV.

---

<div class="post-metadata">

**Author:** ![jose.rocha](https://avatars.discourse-cdn.com/v4/letter/j/b3f665/32.png) [@jose.rocha](https://forum.magicleap.cloud/u/jose.rocha)\
**Post date:** [July 6, 2026, 4:04pm UTC](https://forum.magicleap.cloud/t/ml2-controller-loses-tracking/7060/3 "2026-07-06T16:04:55Z")

</div>

Just found out that the controller indeed works correcly in the app.  
Problem is that if i dont have the thumb finger resting on it, it stops tracking after a second.  
Is this behaviour configurable? I didnt find anthing in settings. I would like for the tracking to be active all the time.

---

<div class="post-metadata">

**Author:** ![jspire](https://avatars.discourse-cdn.com/v4/letter/j/8dc957/32.png) [@jspire](https://forum.magicleap.cloud/u/jspire)\
**Post date:** [July 9, 2026, 10:55pm UTC](https://forum.magicleap.cloud/t/ml2-controller-loses-tracking/7060/4 "2026-07-09T22:55:41Z")

</div>

That could be an issue with the controller hardware. Do you have any other ML2s to compare it to?