[vtkusers] vtkLookupTable question

[Dave Semeraro]

I seem to recall setting the scalar range in the mapper. Something like,

mapper->SetScalarRange( low, high);

where mapper is some vtk mapper object.


At 03:40 PM 5/16/2002 -0500, navarro christopher michael wrote:

>Hi,
>
>I am trying to view a cutting plane (of an iso-surface) of some vorticity
>data that has been normalized on it's maximum value such that it goes from
>-1 to 0.17.  I built the table as follows:
>
>         wcLut = vtkLookupTable::New();
>         wcLut->SetHueRange(2.0/3.0, 0);  // blue to red and everything in
>between
>
>         wcLut->Build();
>
>
>This lookup table works just fine for data that ranges from 0 to 1 but for
>the vorticity, I need the colors to vary from -1 to 0.17 and thus I get no
>variation until it gets to positive vorticity....I tried to do:
>
>         wcLut->SetRange(-1.0, 0.17);
>
>after building the table but it doesn't work.  Does anyone know how I can
>set the table to vary over a specific range?  Thanks!
>
>-Chris
>
>
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Dave Semeraro Ph.D.
Visualization and Virtual Environments Group
NCSA University of Illinois
605 E. Springfield Ave.
Champaign, IL 61820
Semeraro at ncsa.uiuc.edu
(217) 244-1852