構造格子から非構造格子への変換(VTKライブラリ)

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#include <vtkSmartPointer.h>
#include <vtkXMLGenericDataObjectReader.h>
#include <vtkXMLUnstructuredGridWriter.h>
#include <vtksys/SystemTools.hxx>
 
#include "vtkCleanUnstructuredGrid.h"
#include "vtkCleanUnstructuredGridCells.h"
 
#include<string>
 
int main(int argc, char* argv[])
{
  // Verify input arguments
  if (argc < 2)
    {
    std::cerr << "Required arguments: InputFilename" << std::endl;
    return EXIT_FAILURE;
    }
 
  // Get the filename from the command line;
  std::string inputFilename = argv[1];
 
  // Get all data from the file
  vtkSmartPointer<vtkXMLGenericDataObjectReader> reader =
    vtkSmartPointer<vtkXMLGenericDataObjectReader>::New();
  reader->SetFileName(inputFilename.c_str());
  reader->Update();
 
  vtkSmartPointer<vtkCleanUnstructuredGrid> cleanFilter =
    vtkSmartPointer<vtkCleanUnstructuredGrid>::New();
  cleanFilter->SetInputConnection(reader->GetOutputPort());
  cleanFilter->Update();
 
  vtkSmartPointer<vtkCleanUnstructuredGridCells> cleanCellsFilter =
    vtkSmartPointer<vtkCleanUnstructuredGridCells>::New();
  cleanCellsFilter->SetInputConnection(cleanFilter->GetOutputPort());
  cleanCellsFilter->Update();
 
  std::string outputFilename = vtksys::SystemTools::GetFilenameWithoutExtension(inputFilename)
                               + ".vtu";
  vtkSmartPointer<vtkXMLUnstructuredGridWriter> writer =
    vtkSmartPointer<vtkXMLUnstructuredGridWriter>::New();
  writer->SetFileName(outputFilename.c_str());
  writer->SetInputConnection(cleanCellsFilter->GetOutputPort());
  writer->Update();
}