OptionalbiomesBiome ids it belongs to (empty = any).
OptionaldepthWater depth range, metres.
OptionalheightHeight above sea level (ground/shore) or flight height above ground (air), metres.
OptionalminMinimum share of the matching biomes (0…1).
OptionalnearMust be within this many metres of water.
OptionalslopeGround slope range (rise/run).
What it stands on or in.
OptionaltemperatureTemperature range, °C.
Where an asset can plausibly go — the same shape as
PlacementRulein threejs-worldgen, so these rules work with itsisPlausibleandplanSpawnsas they are.