color control

VisADers,

I am using VisAD to display water volume over a
terrain and I am trying to get more control over the
colors used to display water volume.

Picture of my current state:
http://www.swt.edu/~jp1120/waterflowvis/WATERFLOW2.JPG

I am using a scalar map for water volume.
 new  ScalarMap((RealType) precipitation,Display.RGB);

But I would really like to be able to map specific
values and ranges to specific colors.  0 to green, .01
to 1.0 mapped to light blue, 1.01 - 5.0 to dark blue,
etc...


Any suggestions on how I can accomplish this type of
color mapping?

-Jay

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