[vtkusers] how to control the opacity for different region?

Yixun Liu enjoywm at cs.wm.edu
Thu Jun 25 15:20:19 EDT 2009

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Hi,
I have a image which includes several regions. I want to control the
opacity for each region. How to do this?
It seems that VTK only supports intensity-based opacity mapping function.

Thanks.

Yixun

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