Controllers not appearing in WebXR session via streamed PCVR (Virtual Desktop)

[samuelm2]

PlayCanvas XR input events not firing despite working native WebXR

Environment

• Chrome 143.0.7499.170 (64-bit)
• Meta Quest 3 connected to PCVR via Virtual Desktop 1.34.14
• Repro: WebXR Tracked Controllers tutorial

Steps to reproduce

1. Connect Quest 3 to PC using Virtual Desktop
2. Open the tutorial project in Chrome
3. Enter XR session — headset tracking works, VR renders correctly
4. Controllers do not appear in the scene

Expected: Controllers visible and tracked in VR

Actual: VR session starts correctly but controllers never appear

Additional context

Works in: Quest 3 native browser (controllers appear correctly)

Broken in: Chrome on PC via Virtual Desktop

Investigation

• app.xr.input.on('add', fn) callback never fires
• Controller position via native WebXR API does work
• Console shows polyfill errors (unknown if related):

Uncaught TypeError: Cannot set properties of undefined (setting 'WebXRPolyfill')
Uncaught ReferenceError: WebXRPolyfill is not defined

• [Source of failing polyfill patch](https://launch.playcanvas.com/api/assets/files/scripts/webxr-polyfill/webxr-polyfill-patch.js?id=35049907&branchId=fea7377c-8461-49a9-9673-fa8b511cea3d)

Not yet tested

• Quest Link (wired/Air Link)

[Maksims]

Please try without polyfill.

[samuelm2]

https://gist.github.com/samuelm2/05171614a7e940281bb87c14067d0b81

Here's a minimum repro, no polyfill.

Whenever you open in Quest Browser for standalone quest rendering, it works fine, hands are detected. In chrome PCVR streaming, it enters VR but the hand callbacks never fire.

[Maksims]

Do any other WebXR (non-playcanvas) show same problem with setup you have, like the ones from here: https://immersive-web.github.io/webxr-samples/ ?

[samuelm2]

https://immersive-web.github.io/webxr-samples/input-tracking.html

Controller tracking works with this demo.

But weirdly, when I do the no polyfill version of that demo ( https://immersive-web.github.io/webxr-samples/input-tracking.html?usePolyfill=0 ) tracking only seems to start after I open and close the quest menu. Not sure why

[kfarr]

Possibly related, I don't know how playcanvas initializes webxr but if it's asking for hands as well as controllers there seems to be a known issue with chrome + quest link: https://issues.chromium.org/issues/443475182#comment22

[Maksims]

@kfarr it might be related, thanks for the link.
We do by default request hands indeed. Maybe there should be a flag exposed to disable hands by default.