Hydraulic Erosion: Carving Terrain by Accumulation

Rain on a fractal heightmap, one gather at a time — until the noise grows rivers.

6 tasks

1. Seeing the Ground
2. Which Way Is Down
3. Everybody Downhill At Once
4. Capacity: What the Water Can Carry
5. Ping-Pong the Whole Landscape
6. Two Hundred Steps, and a River Appears

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