# Licence: 3D anatomy models (`skin.glb`, `bone.glb`, `hazard.glb`)

These three files are **adapted from BodyParts3D** and are licensed under the
**Creative Commons Attribution 4.0 International** licence (CC BY 4.0),
<https://creativecommons.org/licenses/by/4.0/>.

## Attribution

> BodyParts3D, © The Database Center for Life Science licensed under CC Attribution 4.0 International

That is the wording the licensor asks for. Each file also carries it in its
glTF `asset.copyright` field, and the viewer shows it beside the model and in
the text alternative.

- Title: BodyParts3D, Release 4.0 (2013), `part_of` polygon data
  (`partof_BP3D_4.0_obj_99.zip`, sha256
  `9fbc713fffeee924a5a657d9813d84d7eb957bded63adb854931dd5e3eb61c97`)
- Author / licensor: The Database Center for Life Science (DBCLS), Research
  Organization of Information and Systems, Japan
- Source: <https://dbarchive.biosciencedbc.jp/en/bodyparts3d/download.html>

## Which licence applies: the sources disagree

The upstream sources do not all say the same thing, so both readings are recorded here.

| Source | Fetched | Says |
| --- | --- | --- |
| Licence page, <https://dbarchive.biosciencedbc.jp/en/bodyparts3d/lic.html> ("Last updated: 2025/02/27") | 2026-10-10 | **CC BY 4.0**, with the credit line quoted above |
| `README_e.html` §3 License ("Last updated: 2025/02/25") | 2026-10-10 | CC BY 4.0, with the same credit line. Its "summary" link, however, still points to the CC BY-SA 2.1 JP deed. |
| Header comment in every OBJ in the 2013 archive | 2026-10-10 | "Creative Commons Attribution-Share Alike 2.1 Japan" |

**CC BY 4.0 governs.** The OBJ headers do not name a licence on their own
authority: they refer the reader to
`http://dbarchive.biosciencedbc.jp/en/bodyparts3d/lic.html` for the licence,
and that page now specifies CC BY 4.0 for the same Release 4.0 data. Creative
Commons licences are non-exclusive, so the licensor's later, more permissive
grant is available to us alongside the older one.

Snapshot of the licence page (fetched 2026-10-10; sha256 of the fetched HTML
`62a90421202ae548299e2acf9781ee7126e311b5861dc1d68766670ce234215e`):

> Last updated : 2025/02/27 … The license for this database is specified in
> the Creative Commons Attribution 4.0 International. If you use data from
> this database, please be sure attribute this database as follows:
> "BodyParts3D, © The Database Center for Life Science licensed under CC
> Attribution 4.0 International".

We follow the licensor's current licence page, **CC BY 4.0**. Under the older
**CC BY-SA 2.1 Japan** terms in the OBJ headers, commercial use and adaptation
are also permitted. The only difference would be share-alike: these three
adapted files would then have to be offered under BY-SA. Nothing else on this
site is an adaptation of the meshes, so share-alike would not reach the site's
code or its point data in either reading.

## Changes made (CC BY 4.0 §3(a)(1)(B))

Produced by `phoenix/tools/anatomy3d/` (`select.mjs`, `build.mjs`). The
`manifest.json` beside these files records the exact inputs, tool versions,
arguments and output hashes.

- **Subset.** Only the elements listed in `tools/anatomy3d/structures.json`:
  - `skin.glb`: the skin (FMA7163).
  - `bone.glb`: 216 elements, i.e. the bones, the sternum parts and the costal
    cartilages.
  - `hazard.glb`: trachea, common carotid, femoral and radial arteries, eyeball
    sclera and cornea, and medulla oblongata.
- **Cleaned.** Disconnected fragments of fewer than 8 triangles were removed
  (stray triangles in the source). In this build that was 144 triangles from
  the skin, 3,341 from 139 bone elements and 816 from 8 hazard elements. The
  per-element counts are in `manifest.json` (`dropped_fragment_triangles`).
- **Re-oriented and rescaled.** Millimetres became metres, and the model was
  turned from Z-up to Y-up with the anterior surface facing +Z.
- **Simplified, quantized and compressed** with gltfpack (meshopt).
  Simplification ratios: skin 0.2, bone 0.25, hazard 0.3.
- **Recoloured.** Flat per-layer materials replace the original colours.

## Not covered by this licence

The acupuncture point positions drawn on the model
(`phoenix/priv/anatomy/points_3d.exs`) and the viewer's code are Verscienta's
own work. They are not adaptations of these meshes.