The default riverbed terrain index. Carved stream-bed faces blend toward
this type's color/texture (see ChunkGeometryOptions.riverbedTerrain).
ChunkManager auto-resolves the option from whichever active terrain
definition has id 'riverbed', so custom packs can restyle the bed.
The default riverbed terrain index. Carved stream-bed faces blend toward this type's color/texture (see ChunkGeometryOptions.riverbedTerrain). ChunkManager auto-resolves the option from whichever active terrain definition has id 'riverbed', so custom packs can restyle the bed.