{
  "params": {
    "scheme": {
      "type": "choice",
      "options": [
        "silver",
        "bronze",
        "dark",
        "mint",
        "retro"
      ],
      "default": "silver",
      "label": "Scheme",
      "describe": "Colours: silver (polished metal, rainbow rim lights), bronze (brass hull, amber lights), dark (black hull, violet glow), mint (pale green, warm cupola) or retro (cream with a red band, 1950s B-movie)."
    },
    "lights": {
      "type": "range",
      "min": 6,
      "max": 18,
      "step": 2,
      "default": 12,
      "label": "Rim lights",
      "describe": "Number of lights on the turning rim ring, 6 to 18."
    },
    "legs": {
      "type": "toggle",
      "default": true,
      "label": "Landing legs",
      "describe": "Three landing legs with round pads. Off = legs retracted; the saucer then rests on its underside."
    },
    "size": {
      "type": "range",
      "min": 0.4,
      "max": 2.5,
      "step": 0.05,
      "default": 1,
      "label": "Size",
      "describe": "Uniform scale. 1 is 10 m across; 0.4 is a 4 m scout pod; 2.5 a 25 m mothership."
    }
  },
  "presets": {
    "b-movie": {
      "scheme": "retro",
      "lights": 8
    },
    "night visitor": {
      "scheme": "dark",
      "lights": 16,
      "legs": false
    },
    "scout pod": {
      "scheme": "mint",
      "size": 0.45
    }
  },
  "night": {
    "rim": {
      "zone": "rim",
      "intensity": 2.2,
      "describe": "The rim ring lights shine in their colours as they turn."
    },
    "cupola": {
      "zone": "cupola",
      "intensity": 0.9,
      "describe": "The glass cupola glows from inside."
    },
    "window": {
      "zone": "window",
      "color": "#fff2b8",
      "intensity": 1.2,
      "describe": "Portholes round the upper hull."
    },
    "emitter": {
      "zone": "emitter",
      "intensity": 1.8,
      "describe": "The ring emitter under the belly."
    }
  }
}