{
  "params": {
    "vortex": {
      "type": "choice",
      "options": [
        "violet",
        "cyan",
        "gold",
        "green"
      ],
      "default": "violet",
      "label": "Vortex",
      "describe": "Colour of the swirling vortex and the ring gems: violet, cyan, gold or green."
    },
    "frame": {
      "type": "choice",
      "options": [
        "stone",
        "metal",
        "crystal"
      ],
      "default": "stone",
      "label": "Frame",
      "describe": "stone (ancient ring of wedge blocks with a keystone), metal (riveted steel ring with gold trim, sci-fi warp gate), crystal (ring of pale ice-crystal shards)."
    },
    "size": {
      "type": "range",
      "min": 1.6,
      "max": 3.2,
      "step": 0.1,
      "default": 2.4,
      "label": "Size",
      "describe": "Inner diameter of the ring in metres; 2.4 lets a 1.8 m character walk through."
    },
    "steps": {
      "type": "toggle",
      "default": true,
      "label": "Steps",
      "describe": "A stepped plinth with a front step under the ring. Off stands the ring straight on two feet."
    }
  },
  "presets": {
    "warp gate": {
      "frame": "metal",
      "vortex": "cyan",
      "size": 2.8
    },
    "ice gate": {
      "frame": "crystal",
      "vortex": "cyan",
      "size": 2
    },
    "golden finish": {
      "frame": "stone",
      "vortex": "gold",
      "size": 3
    }
  },
  "night": {
    "swirl": {
      "zone": "swirl",
      "intensity": 0.9,
      "describe": "The vortex glows in its own colours."
    },
    "glow": {
      "zone": "glow",
      "intensity": 1.2,
      "describe": "The gems set in the ring glow."
    }
  }
}