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.

Question

If you have a simple question about this example contact us at VTKExamplesProject 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.