[vtkusers] Changing Opacity real time

[Sharwari Mavalankar]

hi all,
I am reading 2D BMP slices to build a 3D volume and rendering it using vtk.
I am using KWWidgets to build a UI for my application.
For this purpose I need to change opacity the 3D volume in real time
(interactively)
Can someone suggest possible ways that I can do this?
Does the vtkKWPiecewiseFunction have to be used along with a check button
for this purpose ?
Thanks!
Sharwari
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