# V343 — Mesh-derived collision proxy rebuild

Rebuilt only the central lower-leg collision geometry.

- Source: actual skinned `Body` mesh from Nex FBX, rest pose.
- Bone-weight segmentation: CalfTwist01/02 + KneeShareBone.
- Axis: `Calf -> Foot` = knee -> ankle.
- Shape: 11 tapered, offset elliptical cross-sections per side.
- Central collision inflation: 1.10.
- Actual selected skin vertex coverage: L 95.25%, R 94.91%.
- No per-exercise radius is needed by this geometry.
- Added reusable `assets/nex/collision/nex-collision-surface.v1.mjs`.

Important rig truth:
`Calf -> Thigh` is not proximal shin; it runs through the thigh.

STOP:
The Figure Four grip solver has NOT been re-run and has NOT been modified here.
Next step is generic integration: receiver surface lookup should consume this central proxy instead of `capsuleRadiusMeters`.