{
  "version": "0.1",
  "nodes": {
    "1": {
      "id": 1,
      "name": "Bar A",
      "op": {"type": "Cube", "size": {"x": 100, "y": 20, "z": 10}}
    },
    "2": {
      "id": 2,
      "name": "Bar A Centered",
      "op": {"type": "Translate", "child": 1, "offset": {"x": -50, "y": -10, "z": 0}}
    },
    "3": {
      "id": 3,
      "name": "Bar B",
      "op": {"type": "Cube", "size": {"x": 20, "y": 100, "z": 10}}
    },
    "4": {
      "id": 4,
      "name": "Bar B Centered",
      "op": {"type": "Translate", "child": 3, "offset": {"x": -10, "y": -50, "z": 0}}
    },
    "5": {
      "id": 5,
      "name": "Cross Frame",
      "op": {"type": "Union", "left": 2, "right": 4}
    }
  },
  "materials": {},
  "part_materials": {},
  "roots": [{"root": 5, "material": "default"}]
}