threejs-webxr

When to use this skill

ALWAYS use this skill when the user mentions:

• Entering VR/AR, navigator.xr, reference spaces, session requestAnimationFrame loop via renderer
• VRButton, ARButton, XRButton creation patterns from examples
• Controller models, hand tracking meshes, estimated real-world lighting probes

IMPORTANT: webxr vs renderers vs camera

Topic	Skill
Enable XR on renderer, sizing	threejs-renderers (basics) + threejs-webxr (session)
Desktop projection	threejs-camera

Trigger phrases include:

• "WebXR", "VRButton", "ARButton", "XRControllerModelFactory", "hand tracking"
• "Virtual Reality", "Augmented Reality", "Immersive"

How to use this skill

1. HTTPS requirement and feature detection for XR availability.
2. Buttons: use official button factories to create DOM entry points; handle session end.
3. Renderer: call renderer.xr.enabled = true patterns per docs; prefer setAnimationLoop for XR loops.
4. Controllers: attach models via factories; read gamepad axes/buttons carefully with fallbacks.
5. Hands: opt-in hand models when runtime supports; performance implications.
6. Lighting: XREstimatedLight for AR realism—combine with threejs-lights cautiously.
7. Exit: restore non-XR render loop and resize handling on session end.

See examples/workflow-xr-button.md.

Doc map (official)

Docs section	Representative links
Renderer XR	https://threejs.org/docs/WebXRManager.html
Webxr addons	https://threejs.org/docs/VRButton.html
Webxr addons	https://threejs.org/docs/ARButton.html
Webxr addons	https://threejs.org/docs/XRControllerModelFactory.html

Scope

• In scope: Documented WebXR manager + listed addons for buttons/controllers/hands/planes.
• Out of scope: Store submission, OpenXR runtime specifics, custom native layers.

Common pitfalls and best practices

• Desktop testing requires XR emulation or hardware; fail gracefully.
• Mismatched reference space causes floor offset—validate stage vs local-floor.
• Heavy post chains may not meet VR frame time—profile aggressively.

Documentation and version

WebXR entry points span Addons → Webxr and renderer WebXRManager in three.js docs. Browser and device capabilities vary—answers should cite the official example name and three.js version when possible.

Agent response checklist

When answering under this skill, prefer responses that:

1. Link WebXRManager, VRButton, ARButton, or controller factories as relevant.
2. Use setAnimationLoop patterns with threejs-renderers for XR render loops.
3. Avoid duplicating desktop threejs-camera projection advice for XR eyes.
4. Mention reference space choice (local-floor, etc.) at a high level with docs link.
5. Flag performance interaction with threejs-postprocessing in VR.

References

• https://threejs.org/docs/WebXRManager.html
• https://threejs.org/docs/VRButton.html
• https://threejs.org/docs/ARButton.html
• https://threejs.org/docs/XRControllerModelFactory.html

Keywords

English: webxr, vr, ar, xr session, controller, hand tracking, three.js

Chinese: WebXR, VR, AR, VRButton, controllers, hand tracking, immersive, three.js