Unable to detect removal of HMD with XRDevice.userPresence

[NickHitIQ]

Unity 2019.1.0b8

See: https://docs.unity3d.com/ScriptReference/XR.XRDevice-userPresence.html
Also: https://docs.unity3d.com/ScriptReference/XR.UserPresenceState.html

@""

Indicates whether the user is present and interacting with the device.

Many XR devices such as HMDs can detect whether the user is currently wearing and/or interacting with the device. This property can be used to test the state of this user interaction. The exact behavior of this property will vary with each type of device – some devices will have a sensor specifically to detect user proximity, and users will rely on movement, but applications can reasonably infer that a user is present with the device when the property is UserPresenceState.Present.

On Oculus and Vive, XRDevice.userPresence appears to be equal to UserPresenceState.Present even when the HMD is removed from a user.

On Oculus, having no user inside the headset, but keeping the HMD visible of the base stations, results in XRDevice.userPresence remaining equal to Present. On both platforms, removing the HMD from view of their base stations for approximately 10-20 seconds will update the userPresence to NotPresent.

This seems counter to the desired functionality of XRDevice.userPresence. Both Oculus and Vive headsets have a proximity sensor, and it appears that it may be possible to detect user presence through platform specific libraries. However, is it possible to detect a user being inside a HMD using the XR library in unity?

Additional threads covering similar topics, none of which seem to resolve satisfactorily:
https://forum.unity.com/threads/xrdevice-userpresence-does-not-use-proximity-sensors-for-vive-and-wmr-headsets.689236/

XRDevice.userPresence and Samsung Odyssey

I am trying to use XRDevice.userPresence to detect when a user has put on or taken off a headset, but it seems to only work after a minute of having the headset off with no motion. Can Unity confirm that it is only motion detection used for the Samsung Odyssey and not the sensor? I would like to see if I can check immediately when the user removes or puts back on the headset if possible, like the Oculus Rift does. any other pertinent information regarding how Unity’s XRDevice.userPresence works …

Simply detecting the oculus rift's presence [SOLVED]

Hi all, Could you please help me understand why the first ‘if’ clause works but the second one returns nothing? Thanks void Start () { if ( Ovr.Hmd.Detect() > 0 ) Debug.Log ( "Rift detected!" ); if ( OVRManager.display.isPresent && OVRManager.tracker.isPresent ) Debug.Log ( "Both display and tracker are present!" ); }

Oculus Rift: How to detect if Headset is mount or not on user head?

Unity 2017.1.1f1 There are no Unity implementation, so I have to download Oculus Utility, but, OVRManager.HMDMounted and HMDUnmounted are not getting called at all. OVRPlugin.userPresent doesn’t change at all. How to get it work? And how to NOT disable vr camera when headset is not mounted? my run in background is already true.

SteamVR - ProximitySensor?

I found some code to poll the proximity sensor, to know when the HMD is on/off. However I am unsure how to implement - I keep getting the error that the proximity sensor action is not defined in default in actions. Here's the code: SteamVR_Input_Sources m_inputSourceDevice = SteamVR_Input_Sources.Any; if (!isHeadsetOn && SteamVR_Input._default.inActions.Proximity_Sensor.GetState(m_inputSourceDevice)) { Debug.Log("Headset On."); //HeadsetOn(); }…

Detecting Oculus HMD in Unity

https://www.reddit.com/r/Unity3D/comments/auham4/wmr_headset_xrdeviceuserpresence/

[joelybahh]

Unity Standalone VR Support doesn’t yet fully utilize the ‘Generic Functionality’ between HMDs (hopefully very soon).

So it currently seems like it’s not possible with unity XR library.

I’m writing a C# wrapper that gets the proximity sensor status directly from the openvr.dll (Native c++), and will release that when it’s done. However, Unity XR proximity works with Oculus for me when using userPresence, only OpenVR requires the 15second wait.

[lrb]

For those who wants a solution for Android based devices like Vive Focus 3, this thread was life saver:

[Unity3D] Get Proximity Sensor Status - VIVE Wave SDK - Community Forum (htc.com)

Because until now XRDevice.userPresence doesn’t works.