# PlanesIntersection

VTKExamples/Cxx/GeometricObjects/PlanesIntersection

### Code

PlanesIntersection.cxx

    #include <vtkSmartPointer.h>
    #include <vtkPoints.h>
    #include <vtkPlanesIntersection.h>
    #include <vtkSphereSource.h>

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

      double bounds[6];
      sphereSource->GetOutput()->GetBounds(bounds);

      vtkSmartPointer<vtkPoints> box =
        vtkSmartPointer<vtkPoints>::New();

      box->SetNumberOfPoints(8);

      double xMin, xMax, yMin, yMax, zMin, zMax;
      xMin = bounds[0]; xMax = bounds[1];
      yMin = bounds[2]; yMax = bounds[3];
      zMin = bounds[4]; zMax = bounds[5];

      box->SetPoint(0, xMax, yMin, zMax);
      box->SetPoint(1, xMax, yMin, zMin);
      box->SetPoint(2, xMax, yMax, zMin);
      box->SetPoint(3, xMax, yMax, zMax);
      box->SetPoint(4, xMin, yMin, zMax);
      box->SetPoint(5, xMin, yMin, zMin);
      box->SetPoint(6, xMin, yMax, zMin);
      box->SetPoint(7, xMin, yMax, zMax);

      vtkSmartPointer<vtkPlanesIntersection> planesIntersection =
          vtkSmartPointer<vtkPlanesIntersection>::New();
      planesIntersection->SetBounds(bounds);

      int intersects = planesIntersection->IntersectsRegion(box);

      std::cout << "Intersects? " << intersects << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(PlanesIntersection)

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

    add_executable(PlanesIntersection MACOSX_BUNDLE PlanesIntersection.cxx )

    target_link_libraries(PlanesIntersection ${VTK_LIBRARIES})

### Download and Build PlanesIntersection

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

    cd PlanesIntersection/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:

    ./PlanesIntersection

WINDOWS USERS

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