   River Erosion Algorithm
  Anyone know some good sources for river erosion algorithms/theory.  I am thinking to create a basic hill from a sine wave and then have an algorithm to cut the valleys and rivers.I have some ideas, which are pretty processor intensive, but was not wanting to re-invite the wheel if smarter brains than mine have already come up with good algorithms to do this.ThanksRael  
  Can''t say i''ve seen anything off the top of my head, might want to try hereOne algorithm that comes to mind is an inverted tree calculation, applied to a minus operator over the meshes.might be worth looking into~Main    ==Colt "MainRoach" McAnlisProgrammerwww.badheat.com/sinewave  ;  Try **here**. You will get more info than you will know what to do with.  