Three.js source-promotion lab

VR handinput · cubes

Starting…Creating WebGL2 renderer and hand-input contract.

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Pinch ownership mirror

Desktop index-finger mirror

Two fingertip proxies stand in for native hand joints. Change separation while scaling is active to exercise the same-object formula.

hand 1 x-0.22

hand 1 y1.25

hand 1 z-0.45

hand 2 x0.22

hand 2 y1.25

hand 2 z-0.45

Runtime contract

Backend—

Hands—

Controllers—

Grips—

Spheres / cubes—

Hand tracking—

Grabbing—

Scaling—

Selected—

Scale—

Frames0

XR / sample— · —

RUNNING · Source path: spawn → attach → two-hand scale → scene.attach release.

Evidence boundary

Pinned official source: webxr_vr_handinput_cubes.html. This route preserves XRHandModelFactory, pinch events, indexTip.attach, scene.attach, the required hand-tracking feature, controller rays/grips, and same-object scaling. Browser QA proves the WebGL2 desktop mirror and cleanup path; native joint poses, immersive session negotiation, device tracking, and whole-example fidelity remain separate.