A minimal Rust port of weigert's SimpleHydrology program.
This is not an identical port. Most of the rendering stuff has been stripped out so that this program just fetches a premade heightmap and erodes it, giving three files as output: an eroded heightmap, a discharge map, and a momentum map. It accepts any resolution, the only thing that will change is the rendering time. I have tried it with 4096x4096 heightmaps and runs just fine.
First, install Rust.
Be sure to place your heightmap in the root folder (where the cargo.toml is located) and change the constant FILE_NAME on main.rs to the name and extension of your heightmap.
Do cargo run --release. The release tag is important as this ensures maximum performance.
Default is 100 erosion cycles - to change it, edit the CYCLES constant on main.rs.