[vtkusers] vtkLookupTable Questions

[Lisa Sobierajski Avila]

Hello Joseph,

Why can't you use a vtkColorTransferFunction in a vtkMapper? I think this 
should work - do you have an example of why it doesn't?

Lisa

At 06:10 PM 8/18/2000, Joseph Toman wrote:


>Hi,
>
>I need to map scalars to colors in a piecewise linear way. It seems
>like my only two choices (other than rolling my own) are to map them
>linearly with vtkLookupTable or logarithmically with
>vtkLogLookupTable.This seems woefully inadequate so I have to ask
>"What gives?". I saw vtkColorTransferFunction, which sounds exactly
>like what I want, but even though it's a descendant of
>vtkScalarsToColors it doesn't seem to want to work with vtkMapper or
>it's decendents. Is it somehow just for volume rendering? Am I doomed
>to cutting and pasting vtkLogLookupTable in order to get what I need?
>I find it hard to believe there's no generalized scalar to color function
>that a vtkMapper could use with, say, a callback function or something.
>Anyhow, tips, advice, or sage wisdom would be much appreciated.
>
>                                         J. Toman
>
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