Streamlines in 2D/3D

[David Chelberg]

Does anyone have any code illustrating creation of streamlines in 2D?

For example, suppose you have an image.  You compute the gradient of
the image.  Push the gradient data into vectors.  Then you want to
find the "valleys" of the image.  One way to do this is to go in the
direction of the local gradient (the steepest descent).  

Another way of looking at the problem is that suppose you have a local
surface grid.  You want to determine where streams would flow if water
was available at a particular position (an underground spring).  

Anyone have suggestions?

Thanks,

 -- David Chelberg (chelberg at ohiou.edu)
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