[vtkusers] about example on page 126(VTK user's guide)

[jere ju]

 vtkWarpScalar *warp = vtkWarpScalar::New();
 warp->SetInput(geometry->GetOutput());
 warp->SetScaleFactor(0.005);

i rewrote the code in vc++,but it show error like this:
error C2664: 'SetInput' : cannot convert parameter 1 from 'class vtkPolyData
*' to 'class vtkPointSet *'
        Types pointed to are unrelated; conversion requires
reinterpret_cast, C-style cast or function-style cast
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