feat: retire the gantry and billboard districts and light the rest as steel

assets/blender/districts/export-districts.py

@@ -13,16 +13,21 @@ here = Path(__file__).resolve().parent
 root = here.parents[2]
 scene = bpy.data.scenes['Roadside Districts']
 output = root / 'src/assets/nightdrive-districts.glb'
+# Retired in round 6: the overhead gantry and the sign truss now own the road,
+# and the billboards' light strips read as garbled text. They stay authored in
+# the .blend but are no longer exported.
+RETIRED = {'gantry', 'billboard'}
+exported = [o for o in scene.objects if o.name.rsplit('_', 1)[0] not in RETIRED]
 
 for obj in scene.objects:
-    obj.select_set(True)
+    obj.select_set(obj in exported)
 bpy.ops.export_scene.gltf(
     filepath=str(output), export_format='GLB', use_selection=True, use_active_scene=True,
     export_apply=True, export_normals=False, export_texcoords=False, export_materials='NONE',
     export_animations=False, export_cameras=False, export_lights=False, export_yup=True,
 )
 triangles = 0
-for obj in scene.objects:
+for obj in exported:
     obj.data.calc_loop_triangles()
     triangles += len(obj.data.loop_triangles)
 provenance = {
@@ -30,7 +35,8 @@ provenance = {
     'source': 'nightdrive-districts.blend',
     'authorship': 'Original procedural modelling in Blender for this portfolio (author-districts.py); no external assets.',
     'editable_scene': 'Roadside Districts',
-    'pieces': sorted({o.name.rsplit('_', 1)[0] for o in scene.objects}),
+    'pieces': sorted({o.name.rsplit('_', 1)[0] for o in exported}),
+    'retired': sorted(RETIRED),
     'triangles': triangles,
     'attributes': 'POSITION + indices; flat normals derived at runtime',
     'export': '../../../src/assets/nightdrive-districts.glb',