141 lines
7.2 KiB
Markdown
141 lines
7.2 KiB
Markdown
# MakeHuman head prototype
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Status: **retained fallback; superseded as the active NPC head by the Quaternius
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base (ADR-0017).** The owner accepted the basic human head on 2026-11-04. The automated vision gate
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still records REJECT on the eye/lid region as deferred polish. The asset is a
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standalone head/neck extracted from the CC0 MakeHuman base. The assembled path
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adds hair, a hidden scalp trim and the procedural body. The 12 shipped GLBs have
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not been rebuilt with it, and the Quaternius migration replaces it as the active
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base. The development source files were removed from `tmp/` on 2026-11-05.
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## Asset
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- GLB: [`assets/models/blender_src/makehuman_head.glb`](../assets/models/blender_src/makehuman_head.glb)
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- Review sheet: [`blender_previews/sheet_makehuman_head.jpg`](blender_previews/sheet_makehuman_head.jpg)
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- Source workflow (development-only, files removed after the Quaternius pivot;
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retained here as the historical method) — extracts the MakeHuman head, cuts it at the neck, keeps the head/eye/mouth
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components, cuts an almond aperture through a skin eyelid mask, adds recessed
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eyeballs with flat iris/pupil discs, anchors brows to the face surface, renders
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front/three-quarter/profile and exports the standalone GLB.
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- Measurements (final standalone build, `inspect`): **12,641 triangles / 7,690
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split vertices**; bounds approximately `x ±0.094 m`, `y -0.180…0.042 m`,
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`z 1.530…1.803 m` in project Z-up space.
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- Assembled `npc_casual --head mh`: **14,753 triangles / 12,823 seam-split
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vertices / 14 bones / 9 materials**, `inspect` clean. All 12 variants count
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14,693–15,987 triangles with the same head.
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- Materials used: `skin`, `eye_white`, `iris`, `pupil`, `hair`. No textures are
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baked into this prototype.
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## What was done
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1. Imported the CC0 MakeHuman base OBJ and cleared the importer axis rotation.
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2. Applied the project scale/axis transform: 1.82 m body, Z-up, metres,
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front −Y.
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3. Cut the head at the neck (`z ≈ 1.53`) rather than keeping the cut shoulders;
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capped the neck opening.
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4. Built an eyelid mask by subtracting an almond aperture from a skin sphere
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centred on each eye (`solver = "EXACT"`), then recessed the globes so the
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cornea sits behind the lid plane.
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5. Added flat iris/pupil discs on the globe axis; disabled backface culling so
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the discs stay visible at three-quarter angles.
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6. Anchored brow strips to the skin with object-space ray casts and added a
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shallow supraorbital ridge so they do not float, then reduced the crown
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height to improve the profile silhouette.
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7. Fixed a material-remap bug introduced by joining the extra eye objects: the
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joined head faces were pointing at the `eye_white` slot, making the whole
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head render as white clay. The largest connected component is now forced
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back onto `skin` after the join.
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8. Rendered front/three-quarter/profile views in a neutral review studio and
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exported the standalone GLB.
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## Provenance
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- Base mesh: MakeHuman / MPFB base, CC0, from the local research set
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(development source files removed after the 2026-11-05 Quaternius pivot); see
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[`CREDITS.md`](../CREDITS.md).
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- The head is a **derived prototype**, not a shipped NPC. It does not enter
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`assets/models/blender/npc/`, `npc_base`, the runtime `NpcAvatar` path, CI, or
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a release package. It is retained as a fallback, not the active NPC base.
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- Source photographs/proportions are not used as textures here; this is a
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geometry-only head built from the researched model data.
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## Review criteria
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Accept only if:
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- the head reads as human at front/three-quarter/profile and the neck is a
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clean head/bust silhouette, not a shoulder cut;
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- eyes, brow, nose, mouth and ears are readable without spikes, holes or
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floating shells;
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- the asset is inside the character budget and has no script/contract violation;
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- the prototype remains clearly local and un-integrated until the part pipeline
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is approved.
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## Judge result
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**Owner verdict: ACCEPT (basic human head, 2026-11-04).**
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**Automated vision gate: REJECT** (vision judge `z-ai/glm-5.3-flash`, final
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standalone build render set above). The eye/lid findings below remain deferred
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polish; they are no longer a rollout blocker because the owner accepted the head.
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Blocking findings:
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- **P0 — globe depth is inconsistent across views.** The front/three-quarter
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reads still show a bead-like iris with a pale sclera halo, while the profile
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reduces the eye to a brown sliver. The judge reads this as a faked recess
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rather than a socketed globe under a lid.
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- **P0 — no convincing lid overlap.** The iris remains nearly circular in front
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and the upper lid does not visibly clip the globe; the skin lid mask reads as
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a crater around a bead.
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- **P0 — iris orientation reads decal-locked** at three-quarter, so the gaze
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appears to drift off the head axis.
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- **P0 — the aperture/lid mask is too circular** and lacks medial/lateral
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canthi, so the eye still reads as a doll eye at portrait distance.
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Should-fix findings:
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- the brow tubes are better anchored but the medial ends still detach in
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three-quarter/profile;
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- nose lacks a defined tip/wing and nostrils;
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- mouth is a faint geometric seam with no lip volume;
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- crown/back-of-skull is still faceted and egg-like in profile;
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- the catchlight is baked geometry and is not consistent between eyes.
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What passed: the skin/eye material remap is correct, the eye openings are
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closed, the standalone GLB reports **12,641 triangles / 7,690 split vertices**,
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and an assembled `npc_casual` with this head passes `inspect` at **14,753 /
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16,000 triangles, 12,823 seam-split vertices, 14 bones, no issues**.
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Known limits: bald mannequin-like presentation, stylized geometry-only
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iris/pupil, no rig, no UV texture pass, and the neck cap is a review cut rather
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than a body-welded seam.
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## Assembled prototype (2026-11-04)
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- `_makehuman_head` imports the GLB and adds a **skull-conforming hair cap**
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derived from the closed head shell (scaled shell + boolean front-sphere
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cut + decimate). Hair skips the old `hair_normal.png` because the skull UVs
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produced large dark tangent patches.
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- Head faces fully covered by the cap are deleted to recover ~950 triangles;
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boundary faces stay as a safety band, so the accepted face geometry is
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untouched. The hidden neck plug uses 12 segments.
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- The procedural body was narrowed at the neck and shoulders (chest 0.158,
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neck base 0.060, neck top 0.054, shoulder root z 1.345) and its skin decimate
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dropped to 0.21 so all 12 variants fit the 16,000 cap.
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- Local review renders were removed with the 2026-11-05 `tmp/` cleanup; the
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committed review sheet above is the retained evidence.
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## Deferred polish
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- Replace the radial lid mask with real upper/lower lid masses that fold over
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the globe, with pointed canthi, and pass the profile view.
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- Move the iris onto a curved cornea cap so its orientation follows the globe at
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three-quarter angles, and use a lighting-driven catchlight instead of baked
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white geometry.
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- Refine the hair cap silhouette (current short cap reads as a helmet) and
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improve the full-body shoulder/arm shape before the 12-variant rollout.
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- Add a clean UV/material pass and a contract armature/weights when the head
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becomes part of the shipped library characters.
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