[vtkusers] 'SetOutput' : cannot convert parameter 1 from 'class vtkImageData *' to 'class vtkPolyData *'

[Paul Tait]

according to the docs and examples this should work. What am I doing wrong ?

usg is vtkUnstructuredGrid
// vtkShepardMethod *sm = vtkShepardMethod::New();
// sm->SetInput(usg);
vtkGaussianSplatter *sm = vtkGaussianSplatter::New();
sm->SetInput(usg);
vtkContourFilter *cf = vtkContourFilter::New();

cf->SetOutput(sm->GetOutput());

error C2664: 'SetOutput' : cannot convert parameter 1 from 'class
vtkImageData *' to 'class vtkPolyData *'

same error for vtkShepardMethod too

Thanks Paul Tait