[vtkusers] How to set four independent lookup functions for RGBA ?

[Yi-Yu Chou]

Hi vtk users :

I am trying to build a lookup table with four independent lookup functions 
for RGBA components.
I have tried vtkColorTransferFunction, but it seems not flexilble enough 
for me. Because it can't be used to build independent lookup functions for 
RGBA, and it only deal with RGB components.
How should I do ? Any suggestions would be appreciated !!!!!
Thanks in advance.

Yi-Yu

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