# IntersectionPolyDataFilter

VTKExamples/Cxx/PolyData/IntersectionPolyDataFilter

### Code

IntersectionPolyDataFilter.cxx

    #include <vtkActor.h>
    #include <vtkIntersectionPolyDataFilter.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkSphereSource> sphereSource1 = vtkSmartPointer<vtkSphereSource>::New();
      sphereSource1->SetCenter(0.0, 0.0, 0.0);
      sphereSource1->SetRadius(2.0f);
      sphereSource1->Update();
      vtkSmartPointer<vtkPolyDataMapper> sphere1Mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
      sphere1Mapper->SetInputConnection( sphereSource1->GetOutputPort() );
      sphere1Mapper->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> sphere1Actor = vtkSmartPointer<vtkActor>::New();
      sphere1Actor->SetMapper( sphere1Mapper );
      sphere1Actor->GetProperty()->SetOpacity(.3);
      sphere1Actor->GetProperty()->SetColor(1,0,0);

      vtkSmartPointer<vtkSphereSource> sphereSource2 = vtkSmartPointer<vtkSphereSource>::New();
      sphereSource2->SetCenter(1.0, 0.0, 0.0);
      sphereSource2->SetRadius(2.0f);
      vtkSmartPointer<vtkPolyDataMapper> sphere2Mapper = vtkSmartPointer<vtkPolyDataMapper>::New();
      sphere2Mapper->SetInputConnection( sphereSource2->GetOutputPort() );
      sphere2Mapper->ScalarVisibilityOff();
      vtkSmartPointer<vtkActor> sphere2Actor = vtkSmartPointer<vtkActor>::New();
      sphere2Actor->SetMapper( sphere2Mapper );
      sphere2Actor->GetProperty()->SetOpacity(.3);
      sphere2Actor->GetProperty()->SetColor(0,1,0);

      vtkSmartPointer<vtkIntersectionPolyDataFilter> intersectionPolyDataFilter =
        vtkSmartPointer<vtkIntersectionPolyDataFilter>::New();
      intersectionPolyDataFilter->SetInputConnection( 0, sphereSource1->GetOutputPort() );
      intersectionPolyDataFilter->SetInputConnection( 1, sphereSource2->GetOutputPort() );
      intersectionPolyDataFilter->Update();

      vtkSmartPointer<vtkPolyDataMapper> intersectionMapper = vtkSmartPointer<vtkPolyDataMapper>::New();
      intersectionMapper->SetInputConnection( intersectionPolyDataFilter->GetOutputPort() );
      intersectionMapper->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> intersectionActor = vtkSmartPointer<vtkActor>::New();
      intersectionActor->SetMapper( intersectionMapper );

      vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New();
      renderer->AddViewProp(sphere1Actor);
      renderer->AddViewProp(sphere2Actor);
      renderer->AddViewProp(intersectionActor);

      vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer( renderer );

      vtkSmartPointer<vtkRenderWindowInteractor> renWinInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renWinInteractor->SetRenderWindow( renderWindow );

      renderWindow->Render();
      renWinInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(IntersectionPolyDataFilter)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkFiltersGeneral
      vtkFiltersSources
      vtkInteractionStyle
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping IntersectionPolyDataFilter: ${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(IntersectionPolyDataFilter MACOSX_BUNDLE IntersectionPolyDataFilter.cxx )
      target_link_libraries(IntersectionPolyDataFilter PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(IntersectionPolyDataFilter MACOSX_BUNDLE IntersectionPolyDataFilter.cxx )
      target_link_libraries(IntersectionPolyDataFilter PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS IntersectionPolyDataFilter
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build IntersectionPolyDataFilter

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

    cd IntersectionPolyDataFilter/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:

    ./IntersectionPolyDataFilter

WINDOWS USERS

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