# RemoveVertices

VTKExamples/Cxx/PolyData/RemoveVertices

### Code

RemoveVertices.cxx

    #include <vtkVersion.h>
    #include <vtkXMLPolyDataReader.h>
    #include <vtkXMLPolyDataWriter.h>
    #include <vtkSmartPointer.h>
    #include <vtkCellData.h>
    #include <vtkCellArray.h>
    #include <vtkPolyData.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");
    #if VTK_MAJOR_VERSION <= 5
      writer->SetInput(output);
    #else
      writer->SetInputData(output);
    #endif
      writer->Write();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(RemoveVertices)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(RemoveVertices MACOSX_BUNDLE RemoveVertices.cxx )

    target_link_libraries(RemoveVertices ${VTK_LIBRARIES})

### Download and Build RemoveVertices

Click here to download RemoveVertices and its CMakeLists.txt file. Once the tarball RemoveVertices.tar has been downloaded and extracted,

    cd RemoveVertices/build

If VTK is installed:

    cmake ..

If VTK is not installed but compiled on your system, you will need to specify the path to your VTK build:

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

Build the project:

    make

and run it:

    ./RemoveVertices

WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.