Interface ClimateRiverOptions

Percentage of land cells that may have rivers (0–20). Default 10.

Probability (0–1) of forming a mid-flow lake. Default 0.25.

Maximum steps per river trace. Default 100.

Maximum land elevation — used for origin weighting. Default 12.

Terrain index assigned to lake cells. Default 5 (built-in Water).

Further terrain indices a river ends at on reaching them — other liquids (a lava caldera, an acid pool) that should take a river as an estuary rather than have a channel carved across them. The lake terrain is always a stop. Origins are also kept one cell clear of them.

Hex orientation providing the edge-index → direction mapping. Must match the layout used for rendering or river edges point at the wrong neighbors. Default POINTY_TOP.