[vtkusers] SCALARS and COLOR_SCALARS

[xiaoxu wang]

 Dear vtkUsers,

There are two types of scalar definition,  SCALARS and
COLOR_SCALARS. I don't know how to switch between these two. When it is
using  COLOR_SCALARS, can we still use LookupTable to  display the data?
 When using SCALARS, I can use the following code to display the scalars. It
does not work when using COLOR_SCALARS. Is there any way to comvert
COLOR_SCALARS to SCALARS?

>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
reader=vtkPolyDataReader()
mapper = vtkDataSetMapper()
lut = make_lookupTable('jet.txt')

mapper.SetLookupTable(lut)
mapper.SetInput(reader.GetOutput())
actor = vtkActor()
actor.SetMapper(mapper)
actor.GetProperty().SetOpacity(0.8)
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>

Thanks in advance
Xiaoxu
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