Fix the MPFB prototype neck and ankle junctions

MEMORY.md

@@ -33,14 +33,15 @@ canonical implemented-features list in `docs/development-status.md`.
   points/weights, removes the rig, applies the helper MASK, scales to 1.81 m, retargets the A-pose
   arms to the contract wrist, cuts the neck at 1.505, decimates, bisects the clothing boundaries,
   paints the five slots, adds a short neck flare, project hands, rounded shoes and cuffs, the
-  accepted head and the 14-bone contract armature. Current output: **15,333 tris / 9,241 raw verts /
-  13,314 seam-split verts / 1.810 m / 14 bones / 10 materials**; `inspect` clean and feet grounded.
-  **Not accepted yet:** the decimated neck stub is boxy under the accepted head, the shoes are
-  block-shaped, the ankles taper to points above them, and the shirt hem forms a V at the crotch.
-  A torus collar, a cloth cylinder collar and a skin neck-blend sphere were all tried and removed:
-  they read as a brace, a shelf or a donut. The prototype uses flat slot colours because the
-  one-shot MPFB UV unwrap does not match the per-slot NPC atlases. Renders:
-  `tmp/npc-parts/mpfb_proto/renders55/`; body-only: `body_only.glb`.
+  accepted head and the 14-bone contract armature. Current output: **15,373 tris / 13,552 glTF
+  verts / 13,560 seam-split verts / 1.810 m / 14 bones / 10 materials**; `inspect` clean and feet
+  grounded. The neck is now a radial cut of the decimated column plus a wide 20-segment skin cone
+  (lower cone painted cloth, reads as a V-neck); the ankles are hidden by a 0.14 m shoe shell and a
+  0.10 m pant cuff. Earlier torus collar, cloth cylinder collar and skin neck-blend sphere attempts
+  were removed: they read as a brace, a shelf or a donut. Remaining polish: block-shaped shoes,
+  V-shaped shirt hem at the crotch, skin-tight shirt, angular thigh facets. The prototype uses flat
+  slot colours because the one-shot MPFB UV unwrap does not match the per-slot NPC atlases.
+  Renders: `tmp/npc-parts/mpfb_proto/renders60/`; body-only: `body_only.glb`.
 - **Project agent skills (2026-11-03):** two tracked skills live in `.agents/skills/`:
   `gig-line-blender-asset-contract` and `gig-line-release-qa`. They are guidance only,
   add no runtime dependency and are referenced from `tools/README.md`. The third-party

TODO.md

@@ -203,24 +203,25 @@ owner reviews the silhouette and a production integration decision is recorded.
       apply the helper MASK, scale to 1.81 m, retarget the A-pose arms to the contract wrist
       (`x=±0.27`, `z=0.78`), cut the neck at 1.505, decimate, bisect the clothing boundaries, paint
       the five slots, add a short neck flare, project hands, rounded shoe shells, cuffs, the
-      accepted head and the 14-bone armature. Current output: **15,333 tris / 9,241 raw verts /
-      13,314 seam-split verts / 1.810 m / 14 bones / 10 materials**; `inspect` clean, feet grounded.
+      accepted head and the 14-bone armature. Current output: **15,373 tris / 13,552 glTF verts /
+      13,560 seam-split verts / 1.810 m / 14 bones / 10 materials**; `inspect` clean, feet grounded.
 - [x] Replace the spiky decimated MPFB hands with the project palm/finger primitives, straighten the
       splayed MPFB feet so the shoes point forward, and use rounded shoe shells + cuffs instead of
       flat blocks. Use flat slot colours in the prototype because the one-shot MPFB UV unwrap does
       not match the per-slot NPC atlases.
-- [ ] Owner reviews the current MPFB body renders (`tmp/npc-parts/mpfb_proto/renders55/`):
-      the head/hair read well, but the decimated neck stub is boxy where the accepted head sits on
-      it, the shoes are still block-shaped, the ankles are pencil-thin where they meet the shoe
-      shells, and the shirt hem forms a V at the crotch. Earlier collar/neck-blend attempts were
-      rejected (disk shelf, neck brace, sawtooth collar); the current build ships no collar.
-- [ ] Fix the neck junction before any rollout: either cap and taper the accepted head's open
-      bottom in `makehuman_head.glb` (rebuild the source, re-review the face) or insert a welded,
-      smooth neck mass with enough poly budget to avoid the decimated square prism. Do not hide it
-      with a torus/flat disk collar; both read as a brace or shelf.
+- [x] Fix the neck junction without touching the accepted face: cut the decimated neck column
+      radially (all-vertex test inside r=0.085) so the shirt shoulder silhouette stays intact,
+      then bridge the opening with a wide 20-segment skin cone from r=0.10 to r=0.056. The lower
+      cone is painted cloth so the opening reads as a V-neck rather than bare chest. No torus,
+      disk shelf, neck brace or sawtooth collar.
+- [x] Seat the ankles in the shoes: remove the lower-leg x-narrowing, raise the shoe shell to
+      0.14 m and add a 0.10 m pant cuff at z=0.13 so the open tapered ankle is hidden.
+- [ ] Owner reviews the updated MPFB body renders (`tmp/npc-parts/mpfb_proto/renders60/`).
+      Remaining known defects: block-shaped shoe silhouette, white shirt hem forms a V at the
+      crotch, shirt still reads skin-tight, and the 2k-tri body budget leaves some angular thigh
+      facets. These are polish, not blockers for the body direction.
 - [ ] Fix the low-budget seams before any rollout: weld the torso/hip/arm components after the
-      bisects, protect the hip/knee loops during decimation (or rebalance head/body triangles), and
-      rebuild the shoes/ankles so the leg does not taper to a point above a block.
+      bisects, protect the hip/knee loops during decimation (or rebalance head/body triangles).
 - [ ] Record the production integration decision: either bake the approved MPFB body to a committed
       source GLB (CI and fresh checkouts stay MPFB-free) or keep the procedural body as the shipped
       path. Do not add the MPFB extension as a build/CI dependency.

docs/npc-model-sourcing.md

@@ -55,12 +55,14 @@ The MakeHuman body should reuse the approved local head/hand parts rather than f
 a second face implementation.
 
 The current local MPFB full-body prototype (`tmp/npc-research/build_mpfb_npc.py`) assembles the
-accepted head on an MPFB 2.0.18 body at **15,333 / 16,000 tris**, 1.810 m, 14 bones and 10
-materials, with project hands, rounded shoe shells, accessory cuffs and flat slot colours. It is a
-review candidate, not a shipped asset: the decimated neck stub is boxy under the accepted head, the
-shoes remain block-shaped, the ankles taper above the shoe shells, and the shirt hem forms a V at
-the crotch. A torus collar, cloth cylinder collar and skin neck-blend sphere were tried and removed
-because they read as a brace, shelf or donut. The production integration decision (bake a committed
+accepted head on an MPFB 2.0.18 body at **15,373 / 16,000 tris**, 1.810 m, 14 bones and 10
+materials, with project hands, rounded shoe shells, pant cuffs, accessory cuffs and flat slot
+colours. It is a review candidate, not a shipped asset. The neck is a radial cut of the decimated
+column bridged by a wide 20-segment cone (lower cone painted cloth, reading as a V-neck); the ankles
+are hidden by raised shoe shells and pant cuffs. Remaining polish: block-shaped shoes, a V-shaped
+shirt hem at the crotch, a skin-tight shirt and angular thigh facets. A torus collar, cloth cylinder
+collar and skin neck-blend sphere were tried and removed because they read as a brace, shelf or
+donut. The production integration decision (bake a committed
 source GLB or keep the procedural body) and the owner review are tracked in `TODO.md`; MPFB itself
 must not become a CI/build dependency.