airliner mesh is generated in-repo: tools/plane_gen.py writes vendor/plane3d.js (480 tris, CC0, same unit extent as the old Grab3D derivative); attribution updated

vendor/plane3d.js

@@ -1,4 +1,7 @@
-/* Airliner low-poly mesh (599 tris). Derived from 'Passenger Airplane' by Grab3D,
- * CC0 (https://grab3d.com) - decimated and flattened for distant viewing.
- * Non-indexed interleaved: pos(3) nrm(3) colIdx(1); unit extent 1.0. */
-window.__planeVerts = 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Line truncated
+/* Airliner low-poly mesh (480 triangles, flat shaded, no textures).
+ * Generated procedurally by tools/plane_gen.py - original geometry, CC0 1.0.
+ * Non-indexed interleaved: pos(3) nrm(3) colIdx(1); unit extent 1.0,
+ * forward = +Z, up = +Y, nose-to-tail ~2.0 (see PLANE_VERT_SRC in clouds3d.js).
+ * colIdx: 0 = body, 1 = glazing.
+ */
+window.__planeVerts = 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truncated