Just click the flag and watch as a terrain is generated using multiple octaves of Perlin Noise, and then is eroded because of rainfall. (rainfall doesn't have any graphics.)
This uses a different method to do the hydraulic erosion, and my updated Perlin Noise engine. Uses the method described in http://hpcg.purdue.edu/papers/Benes02WSCG.pdf My older project used particles, based off of S
