Switching between WebXR and XrHands crashes game

🧑‍💻 Technical Support
, ,
1

Howdy,

I’m using code similar to the template project for switching between XR modules, but I’m getting errors when doing so. Is there anything I can do to get this working? I really need to for a client project XD

Code:

// Tracking system management
enableImageTracking() {
  if (!this.isImageTrackingEnabled) {
    console.log('🔍 Enabling image tracking')

    // Ensure hand tracking is removed first
    if (this.isHandTrackingEnabled) {
      this.sceneEl.removeAttribute('xrhand')
      this.isHandTrackingEnabled = false
    }

    this.sceneEl.setAttribute('xrweb', {
      allowedDevices: 'any',
    })
    this.isImageTrackingEnabled = true
  }
}

enableHandTracking() {
  if (!this.isHandTrackingEnabled) {
    console.log('👋 Enabling hand tracking')

    // Ensure image tracking is removed first
    if (this.isImageTrackingEnabled) {
      this.sceneEl.removeAttribute('xrweb')
      this.isImageTrackingEnabled = false
    }

    this.sceneEl.setAttribute('xrhand', {
      allowedDevices: 'any',
      cameraDirection: 'back',
      mirroredDisplay: false,
      enableWrists: true,
    })
    this.isHandTrackingEnabled = true
  }
}

Error Logs:

[RuntimeError] XR caught an error; stopping. TypeError: undefined is not an object (evaluating ‘o.processCpuInput.frameStartResult’)
at (anonymous) bundle.tracing.replay.min.js
at onException xrextras.js
at forEach [native code]
at K xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at IA xr-simd-27.4.8.427.js
at tick xr-simd-27.4.8.427.js
at tick 8frame-1.4.1.min.js
at render 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at r 8frame-1.4.1.min.js
at (anonymous) xr-simd-27.4.8.427.js
at sentryWrapped bundle.tracing.replay.min.js
18:27:37
▼ [XR] Pause cannot be called at this time.
at (anonymous) bundle.tracing.replay.min.js
at lA xr-simd-27.4.8.427.js
at onException xrextras.js
at forEach [native code]
at K xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at IA xr-simd-27.4.8.427.js
at tick xr-simd-27.4.8.427.js
at tick 8frame-1.4.1.min.js
at render 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at r 8frame-1.4.1.min.js
at (anonymous) xr-simd-27.4.8.427.js
at sentryWrapped bundle.tracing.replay.min.js
18:27:37
▼ XR threw an exception TypeError: undefined is not an object (evaluating ‘o.processCpuInput.frameStartResult’)
at (anonymous) bundle.tracing.replay.min.js
at onException xr-simd-27.4.8.427.js
at forEach [native code]
at K xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at IA xr-simd-27.4.8.427.js
at tick xr-simd-27.4.8.427.js
at tick 8frame-1.4.1.min.js
at render 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at r 8frame-1.4.1.min.js
at (anonymous) xr-simd-27.4.8.427.js
at sentryWrapped bundle.tracing.replay.min.js
18:27:37
▼ @https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:78608
@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:76694
@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:79495
@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:76694
IA@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:79605
tick@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:249400
tick@https://cdn.8thwall.com/web/aframe/8frame-1.4.1.min.js:1:431868
render@https://cdn.8thwall.com/web/aframe/8frame-1.4.1.min.js:1:432366
@https://cdn.8thwall.com/web/aframe/8frame-1.4.1.min.js:1:1239080
@https://cdn.8thwall.com/web/aframe/8frame-1.4.1.min.js:1:876887
r@https://cdn.8thwall.com/web/aframe/8frame-1.4.1.min.js:1:593080
@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:59934
sentryWrapped@https://browser.sentry-cdn.com/8.55.0/bundle.tracing.replay.min.js:2:67246
at (anonymous) bundle.tracing.replay.min.js
at onException xr-simd-27.4.8.427.js
at forEach [native code]
at K xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at IA xr-simd-27.4.8.427.js
at tick xr-simd-27.4.8.427.js
at tick 8frame-1.4.1.min.js
at render 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at (anonymous) 8frame-1.4.1.min.js
at r 8frame-1.4.1.min.js
at (anonymous) xr-simd-27.4.8.427.js
at sentryWrapped bundle.tracing.replay.min.js
18:27:37
▼ XR threw an exception TypeError: null is not an object (evaluating ‘A.PIXEL_PACK_BUFFER’)
at (anonymous) bundle.tracing.replay.min.js
at onException xr-simd-27.4.8.427.js
at forEach [native code]
at K xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at e xr-simd-27.4.8.427.js
18:27:38
▼ Y@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:75713
@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:80792
nA@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:81299
@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:18:85034
e@https://cdn.8thwall.com/xr-simd-27.4.8.427.js:1:1935
at (anonymous) bundle.tracing.replay.min.js
at onException xr-simd-27.4.8.427.js
at forEach [native code]
at K xr-simd-27.4.8.427.js
at (anonymous) xr-simd-27.4.8.427.js
at e xr-simd-27.4.8.427.js

2

I can take a look. Can you land your changes and share the project with the support workspace?

1 Like
3

Ah, ok I resolved it.

Trying to switch from image targets to hand tracking inside a callback being executed by image targets was probably not the smartest idea. I added a timeout within the callstack so that it can swap (hopefully) after the image targets code as finished.

4

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