Build normalized Xbot character and label developing grips

[a-baran-orhan]

What changed

• make a normalized Mixamo Xbot the default playground and landing-page character
• add a reproducible prepare:xbot asset pipeline for Mixamo FBX exports
• collapse Xbot's duplicated nested skeletons into one canonical 65-bone rig
• rebind both Beta_Surface and Beta_Joints meshes to that shared skeleton
• bake Mixamo centimeter units into meter-scale vertices, bones, and inverse binds
• optimize the runtime asset from 147,336 to 28,372 vertices and about 1.9 MB
• add an automated asset regression test for mesh count, skeleton sharing, units, and geometry budget
• remove the hard-coded wrist orientation that degraded grip poses
• label grip/finger-heavy movements In development while keeping them selectable

Why

The original Xbot export contains two separate skinned meshes with duplicated nested skeletons and centimeter-scale bind data. Passing it through the existing character wrapper caused the skin to collapse or disappear. The normalization pipeline now produces a stable web asset whose two visible meshes share one unambiguous, meter-scale Mixamo skeleton.

Grip fidelity remains a separate animation-system milestone. The current positional IK reaches the bar, but semantic wrist orientation and finger contact still require character-calibrated contact frames; affected movements are clearly labeled in the library.

Validation

• npm run typecheck
• npm test -- --run — 246 tests passed
• npm run build
• automated Xbot asset validation: 2 meshes, 1 shared 65-bone skeleton, 1.7–1.8 m height, under 30k vertices
• visually verified Xbot on jumping jacks, forward lunge, pull-up hang, and open/closed fist poses
• no browser console errors or warnings

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Project	Deployment	Actions	Updated (UTC)
posecode	Ready	Preview, Comment	Jul 12, 2026 9:23pm