[vtkusers] help on scalar color mapping

[zhigao]

What i am trying to color are boxes. I have a scalar array which ranges from
0 to 3000, and i would like it to map in a way which is not evenly spaced, 
for exampe:
0-1 red
1-3 green
3-6 blue
6-12 purple
12-20 another color
20-40 another color
   ...
20000-30000 another color

I check the codes about the vtkLookupTable, it seems like it will equally
divided the range according to the number of color which is not i want. And
i also want the scalar bar to shown in the way above. How should i realize
it?

Any help would be appreciated. Thanks
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