[vtkusers] Please help on vtkLookupTable

[YaoHaofeng]

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.thankshank 
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