# ClipClosedSurface

VTKExamples/Cxx/Meshes/ClipClosedSurface

### Code

ClipClosedSurface.cxx

    #include <vtkSmartPointer.h>

    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkActor.h>
    #include <vtkCamera.h>
    #include <vtkDataSetMapper.h>
    #include <vtkPolyData.h>
    #include <vtkActor.h>
    #include <vtkProperty.h>
    #include <vtkClipClosedSurface.h>
    #include <vtkPlane.h>
    #include <vtkPlaneCollection.h>
    #include <vtkXMLPolyDataReader.h>

    #include <vtkSphereSource.h>

    //
    // Demonstrate the use of clipping of polygonal data
    //

    int main (int argc, char *argv[])
    {
      // PolyData to process
      vtkSmartPointer<vtkPolyData> polyData;

      if (argc > 1)
      {
        vtkSmartPointer<vtkXMLPolyDataReader> reader =
          vtkSmartPointer<vtkXMLPolyDataReader>::New();
        reader->SetFileName(argv[1]);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else
      {
        // Create a sphere
        vtkSmartPointer<vtkSphereSource> sphereSource =
          vtkSmartPointer<vtkSphereSource>::New();
        sphereSource->SetThetaResolution(20);
        sphereSource->SetPhiResolution(11);
        sphereSource->Update();

        polyData = sphereSource->GetOutput();
      }

      double *center = polyData->GetCenter();
      vtkSmartPointer<vtkPlane> plane1 =
        vtkSmartPointer<vtkPlane>::New();
      plane1->SetOrigin(center[0], center[1], center[2]);
      plane1->SetNormal(0.0, -1.0, 0.0);
      vtkSmartPointer<vtkPlane> plane2 =
        vtkSmartPointer<vtkPlane>::New();
      plane2->SetOrigin(center[0], center[1], center[2]);
      plane2->SetNormal(0.0, 0.0, 1.0);
      vtkSmartPointer<vtkPlane> plane3 =
        vtkSmartPointer<vtkPlane>::New();
      plane3->SetOrigin(center[0], center[1], center[2]);
      plane3->SetNormal(-1.0, 0.0, 0.0);

      vtkSmartPointer<vtkPlaneCollection> planes =
        vtkSmartPointer<vtkPlaneCollection>::New();
      planes->AddItem(plane1);
      planes->AddItem(plane2);
      planes->AddItem(plane3);

      vtkSmartPointer<vtkClipClosedSurface> clipper =
        vtkSmartPointer<vtkClipClosedSurface>::New();
      clipper->SetInputData(polyData);
      clipper->SetClippingPlanes(planes);
      clipper->SetActivePlaneId(2);
      clipper->SetScalarModeToColors();
      clipper->SetClipColor(0.8900, 0.8100, 0.3400); // banana
      clipper->SetBaseColor(1.0000, 0.3882, 0.2784); // tomato
      clipper->SetActivePlaneColor(0.6400, 0.5800, 0.5000); // beige

      vtkSmartPointer<vtkDataSetMapper> clipMapper =
        vtkSmartPointer<vtkDataSetMapper>::New();
      clipMapper->SetInputConnection(clipper->GetOutputPort());

      vtkSmartPointer<vtkActor> clipActor =
        vtkSmartPointer<vtkActor>::New();
      clipActor->SetMapper(clipMapper);
      clipActor->GetProperty()->SetColor(1.0000,0.3882,0.2784);
      clipActor->GetProperty()->SetInterpolationToFlat();

      // Create graphics stuff
      //
      vtkSmartPointer<vtkRenderer> ren1 =
        vtkSmartPointer<vtkRenderer>::New();
      ren1->SetBackground(.3, .4, .6);

      vtkSmartPointer<vtkRenderWindow> renWin =
        vtkSmartPointer<vtkRenderWindow>::New();
      renWin->AddRenderer(ren1);
      renWin->SetSize(512,512);

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

      // Add the actors to the renderer, set the background and size
      //
      ren1->AddActor(clipActor);

      // Generate an interesting view
      //
      ren1->ResetCamera();
      ren1->GetActiveCamera()->Azimuth(120);
      ren1->GetActiveCamera()->Elevation(30);
      ren1->GetActiveCamera()->Dolly(1.0);
      ren1->ResetCameraClippingRange();

      renWin->Render();
      iren->Initialize();
      iren->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(ClipClosedSurface)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel
      vtkFiltersGeneral
      vtkFiltersSources
      vtkIOXML
      vtkInteractionStyle
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping ClipClosedSurface: ${VTK_NOT_FOUND_MESSAGE}")
      return ()
    endif()
    message (STATUS "VTK_VERSION: ${VTK_VERSION}")
    if (VTK_VERSION VERSION_LESS "8.90.0")
      # old system
      include(${VTK_USE_FILE})
      add_executable(ClipClosedSurface MACOSX_BUNDLE ClipClosedSurface.cxx )
      target_link_libraries(ClipClosedSurface PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(ClipClosedSurface MACOSX_BUNDLE ClipClosedSurface.cxx )
      target_link_libraries(ClipClosedSurface PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS ClipClosedSurface
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build ClipClosedSurface

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

    cd ClipClosedSurface/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:

    ./ClipClosedSurface

WINDOWS USERS

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