# RadiusOutlierRemoval

VTKExamples/Cxx/Points/RadiusOutlierRemoval

### Description

In this example, outliers are red. Yellow points satisfy the radius and neighbor restrictions.

Warning

The classes used in this example require vtk 7.1 or later.

### Code

RadiusOutlierRemoval.cxx

    #include <vtkSmartPointer.h>
    #include <vtkRadiusOutlierRemoval.h>

    #include <vtkBYUReader.h>
    #include <vtkPLYReader.h>
    #include <vtkXMLPolyDataReader.h>
    #include <vtkPolyDataReader.h>
    #include <vtkOBJReader.h>
    #include <vtkSTLReader.h>
    #include <vtkPointSource.h>

    #include <vtkSphereSource.h>
    #include <vtkGlyph3D.h>

    #include <vtkPolyDataMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkRenderer.h>
    #include <vtkCamera.h>

    #include <vtksys/SystemTools.hxx>

    static vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName);

    int main (int argc, char *argv[])
    {
      vtkSmartPointer<vtkPolyData> polyData = ReadPolyData(argc > 1 ? argv[1] : "");;

      double bounds[6];
      polyData->GetBounds(bounds);
      double range[3];
      for (int i = 0; i < 3; ++i)
      {
        range[i] = bounds[2*i + 1] - bounds[2*i];
      }
      std::cout << "Range: "
                << range[0] << ", "
                << range[1] << ", "
                << range[2] << std::endl;
      std::cout << "# of original points: " << polyData->GetNumberOfPoints() << std::endl;
      vtkSmartPointer<vtkRadiusOutlierRemoval> removal =
        vtkSmartPointer<vtkRadiusOutlierRemoval>::New();
      removal->SetInputData(polyData);
      removal->SetRadius(range[0] / 50.0);
      removal->SetNumberOfNeighbors(6);
      removal->GenerateOutliersOn();
      removal->Update();
      std::cout << "# of removed points: " << removal->GetNumberOfPointsRemoved() << std::endl;

    ///
      double radius = range[0] * .01;
      vtkSmartPointer<vtkSphereSource> sphereSource1 =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource1->SetRadius(radius);

      vtkSmartPointer<vtkGlyph3D> glyph3D1 =
        vtkSmartPointer<vtkGlyph3D>::New();
      glyph3D1->SetInputConnection(removal->GetOutputPort());
      glyph3D1->SetSourceConnection(sphereSource1->GetOutputPort());
      glyph3D1->ScalingOff();
      glyph3D1->Update();
      vtkSmartPointer<vtkPolyDataMapper> glyph3DMapper1 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      glyph3DMapper1->SetInputConnection(glyph3D1->GetOutputPort());
      glyph3DMapper1->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> glyph3DActor1 =
        vtkSmartPointer<vtkActor>::New();
      glyph3DActor1->SetMapper(glyph3DMapper1);
      glyph3DActor1->GetProperty()->SetColor(0.8900, 0.8100, 0.3400);

    ////
      vtkSmartPointer<vtkSphereSource> sphereSource2 =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource2->SetRadius(radius * .75);

      vtkSmartPointer<vtkGlyph3D> glyph3D2 =
        vtkSmartPointer<vtkGlyph3D>::New();
      glyph3D2->SetInputConnection(removal->GetOutputPort(1));
      glyph3D2->SetSourceConnection(sphereSource2->GetOutputPort());
      glyph3D2->ScalingOff();
      glyph3D2->Update();

      vtkSmartPointer<vtkPolyDataMapper> glyph3DMapper2 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      glyph3DMapper2->SetInputConnection(glyph3D2->GetOutputPort());
      glyph3DMapper2->ScalarVisibilityOff();

      vtkSmartPointer<vtkActor> glyph3DActor2 =
        vtkSmartPointer<vtkActor>::New();
      glyph3DActor2->SetMapper(glyph3DMapper2);
      glyph3DActor2->GetProperty()->SetColor(1.0000, 0.4900, 0.2500);

      // 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(glyph3DActor1);
      ren1->AddActor(glyph3DActor2);

      // Generate an interesting view
      //
      ren1->ResetCamera();
      ren1->GetActiveCamera()->Azimuth(120);
      ren1->GetActiveCamera()->Elevation(30);
      ren1->GetActiveCamera()->Dolly(1.5);
      ren1->ResetCameraClippingRange();

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

      return EXIT_SUCCESS;
    }

    static vtkSmartPointer<vtkPolyData> ReadPolyData(const char *fileName)
    {
      vtkSmartPointer<vtkPolyData> polyData;
      std::string extension = vtksys::SystemTools::GetFilenameExtension(std::string(fileName));
      if (extension == ".ply")
      {
        vtkSmartPointer<vtkPLYReader> reader =
          vtkSmartPointer<vtkPLYReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".vtp")
      {
        vtkSmartPointer<vtkXMLPolyDataReader> reader =
          vtkSmartPointer<vtkXMLPolyDataReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".vtk")
      {
        vtkSmartPointer<vtkPolyDataReader> reader =
          vtkSmartPointer<vtkPolyDataReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".obj")
      {
        vtkSmartPointer<vtkOBJReader> reader =
          vtkSmartPointer<vtkOBJReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".stl")
      {
        vtkSmartPointer<vtkSTLReader> reader =
          vtkSmartPointer<vtkSTLReader>::New();
        reader->SetFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else if (extension == ".g")
      {
        vtkSmartPointer<vtkBYUReader> reader =
          vtkSmartPointer<vtkBYUReader>::New();
        reader->SetGeometryFileName (fileName);
        reader->Update();
        polyData = reader->GetOutput();
      }
      else
      {
        vtkSmartPointer<vtkPointSource> points =
          vtkSmartPointer<vtkPointSource>::New();
        points->SetNumberOfPoints(10000);
        points->SetRadius(10.0);
        points->SetCenter(vtkMath::Random(-100, 100),
                          vtkMath::Random(-100, 100),
                          vtkMath::Random(-100, 100));
        points->SetDistributionToShell();
        points->Update();
        polyData = points->GetOutput();
      }
      return polyData;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

    project(RadiusOutlierRemoval)

    find_package(VTK COMPONENTS
      vtkCommonCore
      vtkFiltersCore
      vtkFiltersPoints
      vtkFiltersSources
      vtkIOGeometry
      vtkIOLegacy
      vtkIOPLY
      vtkIOXML
      vtkInteractionStyle
      vtkRenderingContextOpenGL2
      vtkRenderingCore
      vtkRenderingFreeType
      vtkRenderingGL2PSOpenGL2
      vtkRenderingOpenGL2 QUIET)
    if (NOT VTK_FOUND)
      message("Skipping RadiusOutlierRemoval: ${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(RadiusOutlierRemoval MACOSX_BUNDLE RadiusOutlierRemoval.cxx )
      target_link_libraries(RadiusOutlierRemoval PRIVATE ${VTK_LIBRARIES})
    else ()
      # include all components
      add_executable(RadiusOutlierRemoval MACOSX_BUNDLE RadiusOutlierRemoval.cxx )
      target_link_libraries(RadiusOutlierRemoval PRIVATE ${VTK_LIBRARIES})
      # vtk_module_autoinit is needed
      vtk_module_autoinit(
        TARGETS RadiusOutlierRemoval
        MODULES ${VTK_LIBRARIES}
        )
    endif ()

### Download and Build RadiusOutlierRemoval

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

    cd RadiusOutlierRemoval/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:

    ./RadiusOutlierRemoval

WINDOWS USERS

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