{
  "version": "0.1",
  "nodes": {
    "1": { "id": 1, "name": "cone", "op": { "type": "Cone", "radius_bottom": 20, "radius_top": 10, "height": 30, "segments": 64 } }
  },
  "materials": {},
  "part_materials": {},
  "roots": [{ "root": 1, "material": "default" }]
}