[vtkusers] Transparent values of vtkImageData

[Alex Southern]

Hi,

How do I make a part of the colormap transparent? As you can see from 
the image the values at 0.0 are visible on the model and produce an ugly 
rectangular slice. I'd like any zero value to be transparent.

The 2D slice is vtkImageData and im using vtkImageMapToColors.

I can make a proper example if this is necessary, but is it possible to 
achieve this in the first instance?

Thanks
Alex


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