[vtkusers] vtkStructuredPoints

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Is it possible to get cell information from vtkStructedPoints/vtkImageData
so that I can use vtkCellCenters and locate the centers of cells?  I tried
using vtkPointDataToCellData but couldn't get anything working.  Any ideas?

foam.vtk:
# vtk DataFile Version 3.0
vtk output
ASCII
DATASET STRUCTURED_POINTS
DIMENSIONS 101 101 1
SPACING 1 1 1
ORIGIN 0 0 0
POINT_DATA 10201
FIELD FieldData 3
CellType 1 10201 char
....

Example script

reader = vtk.vtkStructuredPointsReader()
reader.SetFileName('foam.vtk')

polyFilter = vtk.vtkPointDataToCellData()
polyFilter.SetInputConnection(reader.GetOutputPort())
polyFilter.PassPointDataOn()

warp = vtk.vtkWarpVector()
warp.SetInput(polyFilter.GetStructuredGridOutput())
thresh = vtk.vtkThreshold()
thresh.SetInputConnection(warp.GetOutputPort())
thresh.ThresholdBetween(8.0, 221.0)
thresh.SetInputArrayToProcess(1, 0, 0, 0, "CellId")

cc = vtk.vtkCellCenters()
cc.SetInputConnection(thresh.GetOutputPort())
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