# Box

VTKExamples/Cxx/Utilities/Box

### Code

Box.cxx

    #include <vtkBox.h>
    #include <vtkSmartPointer.h>

    int main(int, char *[])
    {
      // Define a box
      double bounds[6] = {-1,1,-1,1,-1,1};

      // Define a ray
      double rayOrigin[3] = {-5.0, 0, 0};
      double rayDirection[3] = {1.0, 0, 0};

      double intersection[3];
      double t;

      char hit = vtkBox::IntersectBox(bounds, rayOrigin, rayDirection, intersection, t);

      if(!hit)
      {
        std::cout << "Not hit!" << std::endl;
      }
      else
      {
        // Intersection should be (-1.0, 0, 0)
        std::cout << "Intersection is " << intersection[0] << " " << intersection[1] << " " << intersection[2] << std::endl;
        std::cout << "t is " << t << std::endl;
      }

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(Box)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkCommonDataModel QUIET)
    if (NOT VTK_FOUND)
      message("Skipping Box: ${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(Box MACOSX_BUNDLE Box.cxx )
      target_link_libraries(Box PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(Box MACOSX_BUNDLE Box.cxx )
      target_link_libraries(Box PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS Box
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build Box

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

    cd Box/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:

    ./Box

WINDOWS USERS

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