[vtkusers] Thresholding vtkBandedPolyDataContourFilter

[Jothybasu K Selvaraj]

Hi all,

How to set the thresholf of vtkBandedPolyDataContourFilter?

I want to generate values form, let's say 20 to 80, so I set
GenerateValues(8,20,80).

But the values less than 20 appears to be fully of same colour, I want to
set this region totally transparent.

I tried, Mapper.setScalarRange(20,80) and also mapper.SetScalarrange(0,8),
as there may be eight colours.

Whats wrong with this?

Thanks

Jothy
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