[vtkusers] About Plot3DVectors.tcl.

[=?gb2312?q?=FFffffc3=FFffffcf=FFffffe7=FFffffe2=20=FFffffd0=FFffffbb?=]

  There is a file named "Plot3DVectors.tcl" in
directory "Io/Testing/Tcl".There are sevaral codes in
the file,as following:

vtkStructuredGridGeometryFilter plane$vectorFunction
    plane$vectorFunction SetInput [pl3d$vectorFunction
GetOutput]
    plane$vectorFunction SetExtent 25 25 0 100 0 100
vtkHedgeHog hog$vectorFunction
  hog$vectorFunction SetInput [plane$vectorFunction
GetOutput]

 I alter those codes and write by c++.But error occur
/root/mytitle3D/SSGrid.cxx:127: no matching function
for call to `vtkHedgeHog::
   SetInput(vtkPolyData*)'
/usr/local/include/vtk/vtkDataSetToPolyDataFilter.h:44:
candidates are: virtual
   void
vtkDataSetToPolyDataFilter::SetInput(vtkDataSet*)


Why did the thing hanppen?
 

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