OptionalelevationOptionalelevMust match ChunkGeometryOptions.elevPerturbStrength. Default 0.2.
OptionalnoiseMust match ChunkGeometryOptions.noiseScale. Default 0.35.
OptionalisLiquid predicate. When provided and the cell's terrain is liquid, the computed water surface Y is returned instead of the terrain floor — useful for boats or floating props. Omit to always use the terrain floor.
OptionalsurfaceY lift applied to water surfaces (matches WaterGeometryOptions.surfaceLift). Default 0.02.
World units per elevation step. Must match the terrain geometry's
elevationScale. Default ELEVATION_SCALE.