# advanced_erosion_terrain_heightmap_generation

A standalone Rust terrain generator using `egui`, inspired by Runevision's fast erosion filter and the reference material in `plan/`.

See here:

https://www.shadertoy.com/view/wXcfWn
https://www.shadertoy.com/view/sf23W1
https://blog.runevision.com/2026/03/fast-and-gorgeous-erosion-filter.html

## Project layout

- `src/` contains the standalone Rust app and generator implementation.
- `tests/erosion_prototype.py` is the Python reference prototype used to guide the Rust port.
- `plan/` contains the inspiration and reference documents for the terrain look.

## Running

```bash
cargo run
```

## Current UI

The app uses an `egui` desktop interface with:

- A left control panel with `Generation` and `Advanced` tabs
- Generation controls for image width, image height, generation scale, erosion scale, and random seed
- Advanced controls for strength, gully weight, detail, and octaves
- A right preview area showing both the normalized heightmap and the shaded bumpmap