{
  "params": {
    "piece": {
      "type": "choice",
      "options": [
        "straight",
        "bend",
        "fork",
        "end"
      ],
      "default": "bend",
      "label": "Piece",
      "describe": "straight (river from N edge to S edge), bend (from S edge round to E edge), fork (S edge splitting to N and E), end (a spring pool in the middle feeding a river out through S). Rotate in 90 degree steps."
    },
    "biome": {
      "type": "choice",
      "options": [
        "grass",
        "desert",
        "snow",
        "rock",
        "volcanic",
        "alien"
      ],
      "default": "grass",
      "label": "Biome",
      "describe": "Shared by every Terrain piece: grass (blue water, green banks), desert (teal oasis water, sandy banks), snow (icy water with floes), rock (grey stone banks), volcanic (the river becomes glowing lava), alien (glowing teal liquid, violet banks)."
    },
    "stones": {
      "type": "toggle",
      "default": true,
      "label": "Stepping stones",
      "describe": "A line of flat stones across the river (or cooled basalt blocks on lava)."
    },
    "decor": {
      "type": "range",
      "min": 0,
      "max": 1,
      "step": 0.1,
      "default": 0.6,
      "label": "Decor",
      "describe": "Reeds, river rocks and ground scatter on the banks. 0 gives clean banks."
    },
    "seed": {
      "type": "range",
      "min": 1,
      "max": 50,
      "step": 1,
      "default": 3,
      "label": "Seed",
      "describe": "Moves the rocks, reeds and decor. The channel and edges never change."
    }
  },
  "presets": {
    "lava channel": {
      "biome": "volcanic",
      "piece": "straight",
      "stones": false
    },
    "oasis spring": {
      "biome": "desert",
      "piece": "end"
    },
    "frozen fork": {
      "biome": "snow",
      "piece": "fork",
      "seed": 8
    }
  },
  "night": {
    "lava": {
      "zone": "lava",
      "color": "#ff7a1a",
      "intensity": 1.6,
      "describe": "Lava (volcanic biome) and ember cracks glow orange."
    },
    "glow": {
      "zone": "glow",
      "intensity": 1.2,
      "describe": "Alien liquid, bulb plants and crystals glow in their own teal and pink."
    }
  }
}