zwitschi
ab9c67d266
Measure all eight exported characters and record the stylized proportion bands. All variants pass; no skeleton or mesh rescale was needed.
80 lines
3.7 KiB
Markdown
80 lines
3.7 KiB
Markdown
# NPC proportion audit
|
||
|
||
Status: audited 2026-11-02. All eight library variants are inside the stylized
|
||
proportion guide; no geometry correction was required in this pass. The report
|
||
is repeatable from the exported GLBs:
|
||
|
||
```bash
|
||
python3 tools/npc_proportions.py report
|
||
python3 tools/npc_proportions.py report --json
|
||
```
|
||
|
||
## Method
|
||
|
||
`tools/npc_proportions.py` reads the GLB meshes and rest-pose joint hierarchy:
|
||
|
||
- height from the full mesh bounds;
|
||
- head height, width and aspect from `Head`/`skin` vertices (hair excluded so
|
||
long hairstyles do not change the head measurement);
|
||
- shoulder silhouette from vertices in the upper-chest band around the
|
||
shoulder joint;
|
||
- hip width from `HipL`/`HipR` pants vertices;
|
||
- torso length from the Spine joint to the shoulder joint;
|
||
- leg length from the Spine joint to the lowest vertex;
|
||
- arm length from the shoulder joint to the Hand joint;
|
||
- foot length from the forward extent of the KneeL/KneeR shoe vertices.
|
||
|
||
All ratios are divided by total standing height except `head_aspect`
|
||
(width / head height).
|
||
|
||
## Guide
|
||
|
||
These are stylized-but-credible bands for the game's low-poly adults, not
|
||
photoreal anatomy. The broad build is allowed a larger shoulder/hip silhouette
|
||
than the slim build.
|
||
|
||
| Ratio | Target | Notes |
|
||
| --- | ---: | --- |
|
||
| `head_height` | 0.16–0.22 | deliberately larger than a realistic 0.13–0.15 |
|
||
| `head_aspect` | 0.70–1.00 | width / height; rounded heads are acceptable |
|
||
| `shoulder_width` | 0.28–0.38 | silhouette includes sleeves and build scaling |
|
||
| `hip_width` | 0.17–0.23 | pants-only width, not skirt/coat flare |
|
||
| `torso_length` | 0.28–0.38 | Spine joint to shoulder |
|
||
| `leg_length` | 0.40–0.48 | Spine joint to ground |
|
||
| `arm_length` | 0.28–0.38 | shoulder to hand |
|
||
| `foot_length` | 0.12–0.18 | shoe forward extent |
|
||
|
||
## Result
|
||
|
||
| Character | Height | Head | Aspect | Shoulder | Hip | Torso | Leg | Arm | Foot | Result |
|
||
| --- | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | ---: | --- |
|
||
| `npc_casual` | 1.824 m | 0.190 | 0.907 | 0.320 | 0.209 | 0.307 | 0.449 | 0.329 | 0.144 | PASS |
|
||
| `npc_jacket` | 1.824 m | 0.190 | 0.907 | 0.325 | 0.209 | 0.307 | 0.449 | 0.329 | 0.144 | PASS |
|
||
| `npc_coat` | 1.824 m | 0.190 | 0.907 | 0.329 | 0.209 | 0.307 | 0.449 | 0.329 | 0.144 | PASS |
|
||
| `npc_vest` | 1.819 m | 0.191 | 0.907 | 0.321 | 0.210 | 0.308 | 0.451 | 0.330 | 0.144 | PASS |
|
||
| `npc_dress` | 1.825 m | 0.190 | 0.907 | 0.287 | 0.191 | 0.307 | 0.449 | 0.329 | 0.144 | PASS |
|
||
| `npc_hoodie` | 1.856 m | 0.187 | 0.907 | 0.320 | 0.205 | 0.302 | 0.442 | 0.323 | 0.141 | PASS |
|
||
| `npc_firefighter` | 1.819 m | 0.191 | 0.907 | 0.356 | 0.225 | 0.308 | 0.451 | 0.330 | 0.148 | PASS |
|
||
| `npc_guard` | 1.819 m | 0.191 | 0.907 | 0.370 | 0.219 | 0.308 | 0.451 | 0.330 | 0.144 | PASS |
|
||
|
||
No variant is outside a band, so the body pass does not need a global skeleton
|
||
or mesh rescale. The values closest to a boundary are:
|
||
|
||
- **head height 0.190** against the 0.22 upper bound, and **head aspect 0.907**
|
||
against 1.00 — the head is deliberately large. Any head-size change must be
|
||
coordinated with the face/headgear pass and its gear-fit measurements.
|
||
- **guard shoulder 0.370** and **firefighter hip 0.225** against the broad-build
|
||
upper bounds — these are the intended uniform/turnout silhouettes, not
|
||
outliers.
|
||
- **leg length 0.449** and **torso 0.307** sit inside the guide for all variants;
|
||
the earlier short-leg impression came from the hip joint position, not the
|
||
visible pelvis line.
|
||
|
||
## Follow-up
|
||
|
||
The proportion audit does not replace the visual criteria in
|
||
[`npc-visual-review.md`](npc-visual-review.md): neck/shoulder/hip transitions,
|
||
face depth, hand grips, clothing hems and shoes still need the appearance pass.
|
||
Re-run the audit after any body mesh or skeleton change and record the new
|
||
ratios here.
|