[vtkusers] how to map UnstructuredGrid?

[nikhil butala]

VTKUsers,
 
                I am new to vtk and have a very simple question. I am trying to visualize an UnstructuredGrid using VTK file format. I get the following error:
 
Error E2034 C:\groupsinC.cxx 40: Cannot convert 'vtkUnstructuredGrid *' to 'vtkDataSet *' in  function main()
Error E2342 C:\groupsinC.cxx 40: Type mismatch in parameter 'input' (wanted 'vtkDataSet *',got 'vtkUnstructuredGrid *') in function main()
*** 2 errors in Compile ***
 
Relevant part of my code is as follows:
 
 vtkDataSetReader *reader1 = vtkDataSetReader::New();
 reader1->SetFileName ("C:/hola.vtk");
 reader1->SetScalarsName("groups");
 reader1->SetVectorsName("velocity");

 vtkThreshold *thresh = vtkThreshold::New();
    thresh->SetAttributeModeToUseCellData();
    thresh->ThresholdByUpper(1);
    thresh-> AllScalarsOff();
    thresh-> SetInput(reader1->GetOutput());

vtkDataSetMapper *mapper = vtkDataSetMapper::New();
 mapper->SetInput(thresh->GetOutput() );
 
vtkActor *actor = vtkActor::New();
 actor->SetMapper(mapper);
 actor->GetProperty()->SetColor(.2, .2, .2);
 actor->GetProperty()->SetRepresentationToWireframe();

So I don't know what mapper to use to map Unstructured grid. Can someone help me out?
 
Thanking you,
Yours Sincerely,
Nikhil Butala
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