[vtkusers] Please help on vtkLookupTable

[Andrew Maclean]

Try:
mapper->SetScalarRange(bwLut->GetTableRange());



On 5/22/07, Janny Dong <janny.dong at gmail.com> wrote:
>
> Hi,
>
> Did you try
>
> mapper->SetScalarRange()
> mapper->ScalarVisibilityOn()
>
> btw, I am also new so I can't guarantee it works :P
>
> Janny
>
> On 5/20/07, YaoHaofeng <hfyao1983 at hotmail.com> wrote:
> >
> >  Hi, I am new to VTK and do not know how vtkLookupTable work, I have an
> > array of points with scalar value 0-1500, and I want to map them to
> > different colors, so I do:
> >
> >     vtkLookupTable *bwLut = vtkLookupTable::New();
> >     bwLut->SetTableRange(0, 1536);
> >     bwLut->SetNumberOfColors(256);
> >     bwLut->SetHueRange (0.6667, 0.0);
> >     bwLut->SetSaturationRange (1.0, 1.0);
> >     bwLut->SetValueRange (1.0, 1.0);
> >     bwLut->Build();
> >
> >      vtkPolyDataMapper *mapper = vtkPolyDataMapper::New();
> >     mapper->SetLookupTable(bwLut);
> >     mapper->SetInputConnection(clipper->GetOutputPort());
> >     mapper->SetColorModeToMapScalars ();
> >     mapper->UseLookupTableScalarRangeOn();
> >
> > But the entire image is blue everywhere, please help on correctly
> > displaying colors with scalars.
> >
> > thanks
> >
> > hank
> >
> >
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-- 

___________________________________________
Andrew J. P. Maclean
Centre for Autonomous Systems
The Rose Street Building J04
The University of Sydney  2006  NSW
AUSTRALIA
Ph: +61 2 9351 3283
Fax: +61 2 9351 7474
URL: http://www.cas.edu.au/
___________________________________________
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