[vtkusers] using vtkImplicitFunction in two ways to clip a cylinder

[Dean Inglis]

Im having a problem getting a proof of principle established
that demonstates clipping with vtkClipPolyData using vtkImplicitDataSet.
I would ultimately like to clip a vtkPolyData with an arbitrary 
(non-parametric)
surface defined by vtkPolyData composed of 2D cells (vtkTriangle, 
vtkTriangleStrip
etc.).  I have coded two simple demos in tcl: one uses a vtkPlane as the
vtkImplicitFunction and is controlled interactively with 
vtkImplicitPlaneWidget,
the other uses a vtkPolyData output from a vtkPlaneWidget.  In the latter 
case
I am using vtkImplicitDataSet as the function by assigning a scalar array 
(of 1's) to the
polydata, but no clipping occurs.  Can anyone offer suggestion on how to get
the latter demo working?

best,
Dean

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