{
  "params": {
    "wood": {
      "type": "choice",
      "options": [
        "oak",
        "pine",
        "weathered",
        "dark"
      ],
      "default": "oak",
      "label": "Wood",
      "describe": "Timber tone: oak (warm brown), pine (light, freshly built), weathered (silver-grey), dark (tarred)."
    },
    "weight": {
      "type": "choice",
      "options": [
        "crate",
        "basket"
      ],
      "default": "crate",
      "label": "Counterweight",
      "describe": "crate (a timber box heaped with stones) or basket (a round wicker basket of rocks hung in rope)."
    },
    "wheels": {
      "type": "toggle",
      "default": false,
      "label": "Wheels",
      "describe": "Six solid wheels under the base so it can be hauled into position. Off rests the base on the ground."
    },
    "size": {
      "type": "range",
      "min": 0.6,
      "max": 1.3,
      "step": 0.05,
      "default": 1,
      "label": "Size",
      "describe": "Overall scale. 1 has the pivot 5 m up and a 10 m arm; 0.6 is a small field trebuchet, 1.3 a huge castle-breaker."
    }
  },
  "presets": {
    "castle breaker": {
      "size": 1.3,
      "wood": "dark"
    },
    "field trebuchet": {
      "size": 0.65,
      "weight": "basket",
      "wheels": true,
      "wood": "pine"
    },
    "old warhorse": {
      "wood": "weathered",
      "weight": "basket"
    }
  },
  "night": null
}