[vtkusers] ScalarBar and LookupTable

[Xianjin Yang]

Hi vtkusers,

I color my objects using vtkUnsignedCharArray instead of vtkLookUpTable. To
create a vtkScalarBarActor, I have to do

  scalarBar->SetLookupTable(mapper->GetLookupTable());

However, I have never created any lookup table explicitly, so my scalar bar
always shows a color spectrum from Red to Blue. My questions are: Do I have to
explicitly create a lookup table to reflect my custom color scheme? How do I let
my scalar bar show my custom color scheme defined by vtkUnsignedCharArray?

Thanks a lot

Yang
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