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# RadiusOutlierRemoval

VTKEx/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.

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

### 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.