[vtkusers] question about vtkLookupTable

[Luke J West]

Hi Jim,

  lut->SetTableRange(scalar_min,scalar_max);
  lut->SetHueRange(0,1);        // play
  lut->SetSaturationRange(1,1); // with
  lut->SetValueRange(1,1);      // these

and make sure you invoke this on your mapper...

  Mapper->SetScalarRange(scalar_min,scalar_max);

you can also use

  lut->SetAlphaRange(mn,mx); // for opacity

and if you want to edit the table entries, look at SetTableValue(...), but make
sure you invoke lut->Build() first if you don't want a SEGV.

Luke

eValue(lut->GetIndex(1.e8),rgba);
Quoting jim yu <long353 at msn.com>:

> hi, everybody
>  
> could someone tell me how the vtkLookupTable map a scalar value to a color?
>  
> i've only seen the SetTableValue method. it seems to set a color value at a
> index position of the table. but no scalar value is mentioned.
>  
> thanks a lot
>  
> jim
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