VTK Polydata(vtp)⇒Geomview Object File Format(OFF)

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#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtksys/SystemTools.hxx>
#include <vtkXMLPolyDataReader.h>
 
#include "vtkOFFWriter.h"
 
#include <string>
 
int main(int argc, char *argv[])
{
  if (argc != 2)
    {
    std::cerr << "Usage: " << argv[0] << " Filename(.vtp)" << std::endl;
    return EXIT_FAILURE;
    }
 
  std::string inputFilename = argv[1];
  std::string outputFilename
    = vtksys::SystemTools::GetFilenameWithoutExtension(inputFilename) + ".off";
 
  vtkSmartPointer<vtkXMLPolyDataReader> reader =
    vtkSmartPointer<vtkXMLPolyDataReader>::New();
  reader->SetFileName(inputFilename.c_str());
  reader->Update();
 
  vtkSmartPointer<vtkOFFWriter> writer =
    vtkSmartPointer<vtkOFFWriter>::New();
  writer->SetFileName(outputFilename.c_str());
  writer->SetInputConnection(reader->GetOutputPort());
  writer->Write();
 
  return EXIT_SUCCESS;
}