# PassThrough

VTKExamples/Cxx/InfoVis/PassThrough

### Code

PassThrough.cxx

    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>
    #include <vtkPolyData.h>
    #include <vtkPassThrough.h>

    int main(int, char *[])
    {
      // Create a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->Update();

      std::cout << "Points before: " << sphereSource->GetOutput()->GetNumberOfPoints() << std::endl;

      vtkSmartPointer<vtkPassThrough> passThrough =
        vtkSmartPointer<vtkPassThrough>::New();
      passThrough->SetInputConnection(sphereSource->GetOutputPort());
      passThrough->Update();

      vtkSmartPointer<vtkPolyData> output = vtkPolyData::SafeDownCast(passThrough->GetOutput());

      std::cout << "Points after: " << output->GetNumberOfPoints() << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(PassThrough)

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

    add_executable(PassThrough MACOSX_BUNDLE PassThrough.cxx )

    target_link_libraries(PassThrough ${VTK_LIBRARIES})

### Download and Build PassThrough

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

    cd PassThrough/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:

    ./PassThrough

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.