[vtkusers] Confused about the number of cells after vtkClipPolyData with implicit function

[David Doria]

In this example:
http://www.vtk.org/Wiki/VTK/Examples/Cxx/Broken/PolyData/ImplicitDataSetClipping

I create a sphere (vtkPolyData) and clip it with an implicit cube
(vtkBox). The visual result of the clipping looks correct (the portion
of the sphere that is inside the box remains), but there are 68 cells
reported in the resulting clipped data (clipped->GetNumberOfCells()),
but I only count 20 (2 columns of 10 triangles). Can anyone explain
this discrepancy?

Thanks,

David