{
  "params": {
    "carriage": {
      "type": "choice",
      "options": [
        "naval",
        "field"
      ],
      "default": "naval",
      "label": "Carriage",
      "describe": "naval (low red-ochre ship's carriage on four small wooden trucks, for gun decks and forts) or field (two tall spoked wheels and a long trail resting on the ground, for land batteries)."
    },
    "barrel": {
      "type": "choice",
      "options": [
        "iron",
        "bronze",
        "verdigris"
      ],
      "default": "iron",
      "label": "Barrel",
      "describe": "Barrel metal: iron (dark grey-black), bronze (warm gold-brown) or verdigris (old bronze gone sea-green)."
    },
    "elevation": {
      "type": "range",
      "min": -5,
      "max": 12,
      "step": 1,
      "default": 3,
      "label": "Elevation",
      "describe": "Barrel elevation in degrees, positive raises the muzzle. Same as rotating the barrel part about x; the wooden quoin under the breech follows."
    },
    "size": {
      "type": "range",
      "min": 0.6,
      "max": 1.5,
      "step": 0.05,
      "default": 1,
      "label": "Size",
      "describe": "Overall scale. 1 is a 12-pounder with a 2 m barrel; 0.6 a light 4-pounder; 1.5 a heavy 32-pounder."
    },
    "shot": {
      "type": "toggle",
      "default": true,
      "label": "Shot and tools",
      "describe": "A pyramid of cannonballs, a powder keg and a rammer laid beside the gun."
    }
  },
  "presets": {
    "gun deck": {
      "carriage": "naval",
      "barrel": "iron",
      "elevation": 0
    },
    "fort battery": {
      "carriage": "field",
      "barrel": "bronze",
      "elevation": 10,
      "size": 1.2
    },
    "sunken relic": {
      "carriage": "naval",
      "barrel": "verdigris",
      "shot": false,
      "elevation": -3
    }
  },
  "night": null
}