# Hand source and licence

`study-hands.glb` adapts **Rigged hand** by **Elena FF**.

- Source: https://sketchfab.com/3d-models/rigged-hand-eae97cc2a742413cb5338ab942b12c1e
- Creator: https://sketchfab.com/elenaferfor
- Licence: Creative Commons Attribution-ShareAlike 4.0 International
- Licence terms: https://creativecommons.org/licenses/by-sa/4.0/

This adapted hand asset is distributed under the same CC BY-SA 4.0 licence.
Changes: conversion from the original FBX, simplified indexed geometry, resized embedded
textures (the normal map uses lossless WebP), uniform wrist fitting with preserved finger proportions, mirrored left
hand, retained metacarpal and thumb-base joints, preserved native finger joint frames,
remapped skin weights, and runtime material colour matching. The original avatar is a separate asset and
its source bytes are unchanged.

Rebuild using `node scripts/build-study-hand.mjs node_modules/.cache/study-hand public/models/study-hands.glb --fit`.
The source package and its texture maps are checked by SHA-256 in the builder.

The body and arm bind-joint definitions derive from the existing avatar; the
hand branches retain the source hand rig under those wrists. The avatar's Ready
Player Me / Three.js source and MIT notice remain in [human-avatar.LICENSE.md](human-avatar.LICENSE.md).