# Earthlings 3D models: sources and licences

## body.glb

- **Source:** BodyParts3D 4.0, the "part-of" OBJ pack (`partof_BP3D_4.0_obj_99.zip`) and its part list (`partof_element_parts.txt`), from <https://dbarchive.biosciencedbc.jp/en/bodyparts3d/>.
- **Licence:** Creative Commons Attribution 4.0 International, <https://creativecommons.org/licenses/by/4.0/>, as given on the database's licence page <https://dbarchive.biosciencedbc.jp/en/bodyparts3d/lic.html> (updated 2025-02-27). The OBJ file headers still name CC BY-SA 2.1 Japan; the database's own licence page is the current statement.
- **Changes:** the skin, gullet, stomach, duodenum, small intestine, liver, hepatic portal vein, heart, aorta, common carotid arteries, kidneys, bladder, eyeballs, lungs and skeleton were picked out and joined part by part. Files shared between parts were kept in one part only: the portal vein's files are left out of the liver, the duodenum's out of the small intestine, the eyes' out of the skeleton, and the arteries of the cerebral arterial circle out of the carotids. The meshes were welded, smoothed (Taubin) and simplified with meshoptimizer, converted from millimetres to metres, and meshopt-compressed. Built by `tools/earthlings/`.

## brain.glb

- **Source:** Brainder's FreeSurfer fsaverage surfaces by Anderson Winkler, <https://brainder.org/research/brain-for-blender/>: the pial surfaces (`pial_Full_obj`), the same surfaces cut into the Desikan-Killiany atlas's regions (`pial_DK_obj`), and the subcortical structures (`subcortical_obj`).
- **Licence:** Creative Commons Attribution-ShareAlike 3.0 Unported, <https://creativecommons.org/licenses/by-sa/3.0/>. Because of the ShareAlike term, brain.glb as a whole is offered under CC BY-SA 3.0 too.
- **Changes:** the left and right pial surfaces, the thalami, the cerebellar cortex and the brainstem were turned from FreeSurfer's RAS axes into BodyParts3D's, given one uniform scale so the cortex is as wide as BodyParts3D's brain (×1.0015), and moved to sit in body.glb's skull. The subcortical meshes were smoothed (Taubin); every mesh was simplified with meshoptimizer, converted to metres and meshopt-compressed. Each cortex vertex carries its atlas region as a number in the red channel of its vertex colour (0 is unlabelled, then the 34 regions in alphabetical order, as `tools/earthlings/parts.json` lists them). Built by `tools/earthlings/`.

## Credit line

3D anatomy: BodyParts3D, © The Database Center for Life Science, licensed under CC Attribution 4.0 International. Brain surfaces: Anderson Winkler, brainder.org, CC BY-SA 3.0. One adult body; real bodies vary.