BetterHeart Heart Education — model sources and modifications

1. Cardiovascular mesh subset
Source: Dr. Murat Altun, Anatomi Simülatörü, systems/dolasim.glb
https://github.com/DrMuratAltun/anatomi-simulatoru
Underlying atlas: Z-Anatomy — The libre 3D atlas of anatomy
https://www.z-anatomy.com/
https://github.com/Z-Anatomy/Models-of-human-anatomy
Underlying data: BodyParts3D, The Database Center for Life Science (DBCLS)
https://lifesciencedb.jp/bp3d/
License: Creative Commons Attribution-ShareAlike 4.0 International
https://creativecommons.org/licenses/by-sa/4.0/
Original BodyParts3D: CC BY-SA 2.1 Japan
https://creativecommons.org/licenses/by-sa/2.1/jp/

2. Four chamber cavities and anterior mitral/tricuspid leaflets
Source: BodyParts3D, DBCLS, via jixiangying/anatomy
https://github.com/jixiangying/anatomy
Original assets: FJ2420.obj, FJ2421.obj, FJ2422.obj, FJ2423.obj,
FJ2424.obj, FJ2425.obj. Shared posterior leaflet FJ2432.obj was used
as an alignment reference. License: CC BY-SA 2.1 Japan.

Modifications by BetterHeart: extract heart-associated structures; transform
and rescale to a shared coordinate system; align original cavity and leaflet
meshes by the common posterior mitral leaflet; trim the displayed inferior
vena cava and descending thoracic aorta; pack coordinates and indices into
heart-meshes.bin with a descriptive heart-manifest.json; recolor for education.
The adapted mesh data (heart-meshes.bin and heart-manifest.json) is shared under
Creative Commons Attribution-ShareAlike 4.0 International. Source mesh names
and the transformation are retained in heart-manifest.json.

Nerve paths, blood-flow particles, and right-heart catheter paths are original
educational schematics, not atlas-derived anatomical surfaces or patient data.
Leaflet meshes are static. Chordae and fine nerves are not fully modeled.

Reference for interaction design (not copied code or assets):
https://weatlee.github.io/CHESTTOOLS/Tools/lung-education.html

Three.js 0.180.0 — MIT License; full license in vendor/THREE-LICENSE.txt.
https://github.com/mrdoob/three.js

Dynamic educational additions (2026): valve surfaces, coronary tracer paths and
ECG were authored for BetterHeart as conceptual teaching models.
Clinical disease/device cutaway demonstrations have been removed.

Papillary/chordal apparatus: branching chordae and a supplemental left ventricular
papillary muscle are original teaching geometry. The original atlas papillary
meshes are retained, and their tips deform with ventricular contraction.
Motion reference: https://www.youtube.com/shorts/8n_DeE0DBXA
Biomechanics: https://pubmed.ncbi.nlm.nih.gov/22980066/
No reference-video imagery is included in the published model.