{
  "version": "0.1",
  "nodes": {
    "1": { "id": 1, "name": "base_cube", "op": {"type":"Cube", "size": {"x":50,"y":30,"z":20}} },
    "2": { "id": 2, "name": "base_positioned", "op": {"type":"Translate", "child":1, "offset":{"x":-25,"y":-15,"z":0}} },
    "3": { "id": 3, "name": "cut_cube", "op": {"type":"Cube", "size": {"x":25,"y":30,"z":10}} },
    "4": { "id": 4, "name": "cut_positioned", "op": {"type":"Translate", "child":3, "offset":{"x":0,"y":-15,"z":10}} },
    "5": { "id": 5, "name": "stepped_block", "op": {"type":"Difference", "left":2, "right":4} }
  },
  "materials": {},
  "part_materials": {},
  "roots": [{ "root": 5, "material": "default" }]
}