# ProjectPointPlane

VTKExamples/Cxx/SimpleOperations/ProjectPointPlane

### Description

This example projects a point onto a plane. To use this example, you must have the CVSHEAD version of VTK (as of 2/2/2010).

Other Languages

See (Java), (CSharp)

### Code

ProjectPointPlane.cxx

    #include <vtkSmartPointer.h>
    #include <vtkPlane.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkPlane> plane =
          vtkSmartPointer<vtkPlane>::New();
      plane->SetOrigin(0.0, 0.0, 0.0);
      plane->SetNormal(0.0, 0.0, 1.0);

      double p[3] = {23.1, 54.6, 9.2};
      double origin[3] = {0.0, 0.0, 0.0};
      double normal[3] = {0.0, 0.0, 1.0};
      double projected[3];

      plane->ProjectPoint(p, origin, normal, projected);

      std::cout << "Projected: " << projected[0] << " "
                << projected[1] << " " << projected[2] << std::endl;

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(ProjectPointPlane)

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

### Download and Build ProjectPointPlane

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

    cd ProjectPointPlane/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:

    ./ProjectPointPlane

WINDOWS USERS

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