RemoveVertices

#include <vtkCellArray.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkXMLPolyDataWriter.h>

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

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

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

  vtkNew<vtkXMLPolyDataWriter> writer;
  writer->SetFileName("test.vtp");
  writer->SetInputData(output);
  writer->Write();

  return EXIT_SUCCESS;
}

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(RemoveVertices)

find_package(VTK COMPONENTS 
  CommonCore
  CommonDataModel
  IOXML
)

if (NOT VTK_FOUND)
  message(FATAL_ERROR "RemoveVertices: Unable to find the VTK build folder.")
endif()

# Prevent a "command line is too long" failure in Windows.
set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
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}
)

cd RemoveVertices/build

cmake ..

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

make

./RemoveVertices