[vtkusers] Questions on vtkLookupTable, SetIndexedLookup in connection with graph display

[I_like_activiz]

I think you should use vtkColorTransferFunction instead.
There you can add RGB values like:
                AddRGBPoint(0, 1, 0, 0); // red
                AddRGBPoint(1, 0, 0, 1); // blue
                AddRGBPoint(2, 1, 1, 1); // white
and then you can query color values by:

GetColor(0) \\ 1,0,0
GetColor(1) \\ 0,0,1
GetColor(2) \\ 1,1,1

GetColor(-100) \\ 1,0,0
GetColor(100) \\ 1,1,1
GetColor(1.5) \\ 0.5, 0, 0.5

Values between two defined colors will be interpolated.

You could add a special color for each value below or above a certain
threshold e.g.
AddRGBPoint(-0.001, 0, 1, 0) //green for all values < -0,001 
AddRGBPoint(2.001, 0, 1, 0) // green for all values > 2.001



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