# AddCell

VTKExamples/Cxx/Meshes/AddCell

### Code

AddCell.cxx

    #include <vtkSmartPointer.h>
    #include <vtkTriangle.h>
    #include <vtkCellArray.h>
    #include <vtkPolyData.h>

    int main(int , char *[])
    {
      // Create a triangle
      vtkSmartPointer<vtkPoints> points =
        vtkSmartPointer<vtkPoints>::New();
      points->InsertNextPoint ( 1.0, 0.0, 0.0 );
      points->InsertNextPoint ( 0.0, 0.0, 0.0 );
      points->InsertNextPoint ( 0.0, 1.0, 0.0 );

      vtkSmartPointer<vtkTriangle> triangle =
        vtkSmartPointer<vtkTriangle>::New();
      triangle->GetPointIds()->SetId ( 0, 0 );
      triangle->GetPointIds()->SetId ( 1, 1 );
      triangle->GetPointIds()->SetId ( 2, 2 );

      vtkSmartPointer<vtkCellArray> triangles =
        vtkSmartPointer<vtkCellArray>::New();
      triangles->InsertNextCell ( triangle );

      // Create a polydata object
      vtkSmartPointer<vtkPolyData> polyData =
        vtkSmartPointer<vtkPolyData>::New();

      // Add the geometry and topology to the polydata
      polyData->SetPoints ( points );
      polyData->SetPolys ( triangles );

      std::cout << "There are " << polyData->GetNumberOfCells() << " cells." << std::endl;

      polyData->GetPolys()->InsertNextCell(triangle);

      std::cout << "There are " << polyData->GetNumberOfCells() << " cells." << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(AddCell)

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

    add_executable(AddCell MACOSX_BUNDLE AddCell.cxx)

    target_link_libraries(AddCell ${VTK_LIBRARIES})

### Download and Build AddCell

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

    cd AddCell/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:

    ./AddCell

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.