That's really interesting Kirk, and it's amazing you had the patience to 
try that in POV :-)

One of my first project in C++ has been doing something like that. It's 
been ages since I've played with it and I don't remember all the 
details... But I remember I had the lake problem and solved it by 
filling them allup to the point where they overflow.

I looked into papers about erosion and in the end I was able to simulate 
global erosion as well. You can see the result in this animation done 
with POV-Ray:
http://mink.chewa.net/Erosion.mpg

(I should do it again and adjust the frame rate, it's too quick :-\ )

I also used the same program to get more "realistic" images in Terragen 
(first image) and a played a bit with it in POV-Ray as well (second 
image). I wanted to procedurally add detail in POV-Ray as a function of 
image maps  generated by my program, but unfortunately it was too slow 
to be really usable.

I'd have to dig in the old code again to give more specific help. 
Unfortunately since it was my first project it's not really easy to read...

Good luck !

-- 
Vincent

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