{
  "params": {
    "livery": {
      "type": "choice",
      "options": [
        "cream and red",
        "white and blue",
        "green",
        "yellow",
        "silver and orange"
      ],
      "default": "cream and red",
      "label": "Livery",
      "describe": "Body and accent colours: cream and red, white and blue, green (white body, green skirt and nose), yellow (with a dark skirt), silver and orange."
    },
    "modules": {
      "type": "choice",
      "options": [
        "1",
        "3",
        "5"
      ],
      "default": "3",
      "label": "Modules",
      "describe": "1 (single 12 m double-ended car with two bogies), 3 (29 m articulated tram) or 5 (44 m, the longest city trams). Joints between modules are rotate rigs about y."
    },
    "pantograph": {
      "type": "range",
      "min": 0,
      "max": 1,
      "step": 0.05,
      "default": 1,
      "label": "Pantograph",
      "describe": "Roof pantograph: 0 folded flat on the roof, 1 raised to meet an overhead wire about 2 m above the roof."
    },
    "doors": {
      "type": "range",
      "min": 0,
      "max": 1,
      "step": 0.05,
      "default": 0,
      "label": "Doors",
      "describe": "How far every double door is slid open: 0 closed, 1 fully open (as at a stop)."
    }
  },
  "presets": {
    "city line": {
      "livery": "cream and red",
      "modules": "3"
    },
    "at the stop": {
      "livery": "white and blue",
      "doors": 1
    },
    "heritage single": {
      "livery": "yellow",
      "modules": "1",
      "pantograph": 1
    }
  },
  "night": {
    "headlight": {
      "zone": "headlight",
      "color": "#fff4c8",
      "intensity": 1.2,
      "describe": "Headlights glow."
    },
    "taillight": {
      "zone": "taillight",
      "color": "#ff2a2a",
      "intensity": 1,
      "describe": "Tail lights glow red."
    },
    "sign": {
      "zone": "sign",
      "color": "#ffb23d",
      "intensity": 1.5,
      "describe": "Blank destination boards glow amber."
    },
    "cabin": {
      "zone": "cabin",
      "color": "#e4ecf6",
      "intensity": 0.45,
      "describe": "The lit saloon shows through the windows."
    }
  }
}