# HeadSlice

VTKExamples/Cxx/VisualizationAlgorithms/HeadSlice

### Code

HeadSlice.cxx

    #include <vtkContourFilter.h>
    #include <vtkExtractVOI.h>

    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkMetaImageReader.h>
    #include <vtkNamedColors.h>
    #include <vtkOutlineFilter.h>
    #include <vtkProperty.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>

    int main (int argc, char *argv[])
    {
      if (argc < 2)
      {
        std::cout << "Usage: " << argv[0] << " FullHaad.mhd" << std::endl;
        return EXIT_FAILURE;
      }

    // Create the RenderWindow, Renderer and both Actors
    //
      vtkSmartPointer<vtkNamedColors> colors =
        vtkSmartPointer<vtkNamedColors>::New();

      vtkSmartPointer<vtkRenderer> ren1 =
        vtkSmartPointer<vtkRenderer>::New();

      vtkSmartPointer<vtkRenderWindow> renWin =
        vtkSmartPointer<vtkRenderWindow>::New();
      renWin->AddRenderer(ren1);

      vtkSmartPointer<vtkRenderWindowInteractor> iren =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      iren->SetRenderWindow(renWin);

    // create pipeline
    //

      vtkSmartPointer<vtkMetaImageReader> reader =
        vtkSmartPointer<vtkMetaImageReader>::New();
      reader->SetFileName(argv[1]);
      reader->Update();

      vtkSmartPointer<vtkExtractVOI> extractVOI =
          vtkSmartPointer<vtkExtractVOI>::New();
      extractVOI->SetInputConnection(reader->GetOutputPort());
      extractVOI->SetVOI(0, 255, 0, 255, 45, 45);

      vtkSmartPointer<vtkContourFilter> iso =
        vtkSmartPointer<vtkContourFilter>::New();
      iso->SetInputConnection(extractVOI->GetOutputPort());
      iso->GenerateValues(12, 500, 1150);

      vtkSmartPointer<vtkPolyDataMapper> isoMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      isoMapper->SetInputConnection(iso->GetOutputPort());
      isoMapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> isoActor =
        vtkSmartPointer<vtkActor>::New();
      isoActor->SetMapper(isoMapper);
      isoActor->GetProperty()->SetColor(colors->GetColor3d("Wheat").GetData());

      vtkSmartPointer<vtkOutlineFilter> outline =
        vtkSmartPointer<vtkOutlineFilter>::New();
      outline->SetInputConnection(extractVOI->GetOutputPort());

      vtkSmartPointer<vtkPolyDataMapper> outlineMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      outlineMapper->SetInputConnection(outline->GetOutputPort());

      vtkSmartPointer<vtkActor> outlineActor =
        vtkSmartPointer<vtkActor>::New();
      outlineActor->SetMapper(outlineMapper);

    // Add the actors to the renderer, set the background and size
    //
      ren1->AddActor(outlineActor);
      ren1->AddActor(isoActor);
      ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());
      ren1->ResetCamera();
      ren1->GetActiveCamera()->Dolly(1.5);
      ren1->ResetCameraClippingRange();

      renWin->SetSize(640, 480);

      renWin->Render();
      iren->Start();
      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(HeadSlice)

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

    add_executable(HeadSlice MACOSX_BUNDLE HeadSlice.cxx )

    target_link_libraries(HeadSlice ${VTK_LIBRARIES})

### Download and Build HeadSlice

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

    cd HeadSlice/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:

    ./HeadSlice

WINDOWS USERS

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