{
  "id_to_material_family": {
    "0": "background",
    "1": "concrete",
    "2": "fabric",
    "3": "leather",
    "4": "metal",
    "5": "plastic",
    "6": "stone",
    "7": "wood"
  },
  "material_family_to_id": {
    "background": 0,
    "concrete": 1,
    "fabric": 2,
    "leather": 3,
    "metal": 4,
    "plastic": 5,
    "stone": 6,
    "wood": 7
  }
}