[vtkusers] Problem mapping scalars to colors using a vtkLookupTable

[Peter Kok]

Hello Geofram and others,

I finally found an embarrassingly simple solution to set a
vtkColorTransferFunction in a vtkImagePlaneWidget. It is as simple as
setting the transfer function in the image plane's color map using
ipw.GetColorMap().SetLookupTable(ctf) instead of ipw.SetLookupTable(...).

Now, if only a vtkColorTransferFunction would allow you to specify an
opacity for each scalar... Are there any classes that do such things?

Regards,
Peter
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