[vtkusers] vtkImageTracerWidget question

[freiman at cs.huji.ac.il]

Hello all!
i want to build a GUI which enable user to select a regin of interest from
a 3d volume visualize as 2d slices using vtkimageactor. i found the class:
vtkImageTracerWidget, however it provides only 2d selection.
do someone know how can i extend it to 3d selection, or use
vtkImageTracerWidget to each slice view (when i changed the slice
visualized by vtkimageactor::GetZSlice (int slice_num), the widget stay on
the first slice)
thanks!
moti

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