Made of little things.

"""Export artist-edited .blend files without regenerating their meshes/actions.
blender --background --factory-startup --python-exit-code 1 --python scripts/export-characters.py
"""
import bpy, json, hashlib
from pathlib import Path
ROOT = Path(__file__).resolve().parent.parent
manifest_path = ROOT / 'models/manifest.json'
manifest = json.loads(manifest_path.read_text())
for item in manifest['models']:
    bpy.ops.wm.open_mainfile(filepath=str(ROOT / item['source']))
    rig = next(o for o in bpy.context.scene.objects if o.type == 'ARMATURE')
    meshes = [o for o in bpy.context.scene.objects if o.type == 'MESH' and any(m.type == 'ARMATURE' and m.object == rig for m in o.modifiers)]
    bpy.ops.object.select_all(action='DESELECT')
    rig.select_set(True)
    for mesh in meshes:
        mesh.select_set(True)
    bpy.context.view_layer.objects.active = rig
    target = ROOT / item['path']
    bpy.ops.export_scene.gltf(filepath=str(target), export_format='GLB', use_selection=True,
        export_animations=True, export_animation_mode='ACTIONS', export_anim_single_armature=True,
        export_skins=True, export_yup=True, export_apply=False, export_extras=True)
    binary = target.read_bytes()
    item['size'] = len(binary)
    item['sha256'] = hashlib.sha256(binary).hexdigest()
    item['bones'] = [bone.name for bone in rig.data.bones]
    item['triangles'] = sum(len(p.vertices)-2 for mesh in meshes for p in mesh.data.polygons)
manifest_path.write_text(json.dumps(manifest, indent=2)+'\n')
print('Exported artist-edited character sources; run pnpm test:polish to validate clips and rigs.')