[vtkusers] Please help on vtkLookupTable

[Janny Dong]

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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