RemoveVertices

#include <vtkCellArray.h>
#include <vtkCellData.h>
#include <vtkPolyData.h>
#include <vtkSmartPointer.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkXMLPolyDataWriter.h>

int main ( int argc, char *argv[] )
{
  if (argc < 2)
  {
    std::cout << "Usage: " << argv[0] << " filename.vtp" << std::endl;
    return EXIT_FAILURE;
  }
  std::string filename = argv[1];

  // Read all the data from the file
  vtkSmartPointer<vtkXMLPolyDataReader> reader = vtkSmartPointer<vtkXMLPolyDataReader>::New();
  reader->SetFileName(filename.c_str());
  reader->Update();

  vtkSmartPointer<vtkPolyData> output = vtkSmartPointer<vtkPolyData>::New();
  output->ShallowCopy(reader->GetOutput());
  //output->SetVerts(NULL);
  vtkSmartPointer<vtkCellArray> verts = vtkSmartPointer<vtkCellArray>::New();
  output->SetVerts(verts);
  //output->SetPoints(reader->GetOutput()->GetPoints());
  //output->SetPolys(reader->GetOutput()->GetPolys());

  vtkSmartPointer<vtkXMLPolyDataWriter> writer = vtkSmartPointer<vtkXMLPolyDataWriter>::New();
  writer->SetFileName("test.vtp");
  writer->SetInputData(output);
  writer->Write();

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(RemoveVertices)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkIOXML QUIET)
if (NOT VTK_FOUND)
  message("Skipping RemoveVertices: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(RemoveVertices MACOSX_BUNDLE RemoveVertices.cxx )
  target_link_libraries(RemoveVertices PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(RemoveVertices MACOSX_BUNDLE RemoveVertices.cxx )
  target_link_libraries(RemoveVertices PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS RemoveVertices
    MODULES ${VTK_LIBRARIES}
    )
endif () 

cd RemoveVertices/build 

cmake ..

cmake -DVTK_DIR:PATH=/home/me/vtk_build ..

make

./RemoveVertices