Region center, world X.
Region center, world Z.
Radius (m).
Optionalmode'keep' shows water only INSIDE this disc (a finite water body — pixels
outside every keep disc are clipped); 'cut' punches a hole INSIDE it
(e.g. a boat-hull cutout). Default 'keep'.
OptionalfeatherEdge feather width (m) over which the surface fades out. Default 2.
A circular clip-surface region bounding the water body (Crest's clip surface, as a procedural disc).