[vtkusers] Convert vtkUnstructuredGrid to ExodusII

[张江]

Hi,

Currently I want to convert an unstructured grid data to exodusII format. The input unstructured grid data has a cell type of wedge.
But when I execute the following code, the output data contains TETRA cell type. Can anybody explain this? 

vtkUnstructuredGridReader *reader = vtkUnstructuredGridReader::New();
reader->SetFileName(“input.vtk");
  
reader->Update();

vtkUnstructuredGrid *grid = reader->GetOutput();

vtkExodusIIWriter *writer = vtkExodusIIWriter::New();
writer->SetInputData(grid);
writer->SetFileName(“output.e");
writer->Write();
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