DensifyPoints

VTKExamples/Cxx/Points/DensifyPoints


Description

In this example, the original points are yellow and the added points are red.

The image was produced using this torso dataset

Warning

This example requires vtk 7.1 or greater.

Code

DensifyPoints.cxx

#include <vtkSmartPointer.h>
#include <vtkDensifyPointCloudFilter.h>

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

#include <vtkPointSource.h>
#include <vtkSphereSource.h>
#include <vtkGlyph3DMapper.h>

#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>
#include <vtkNamedColors.h>
#include <vtksys/SystemTools.hxx>

namespace
{
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;

  double maxRange = std::max(std::max(range[0], range[1]), range[2]);

  std::cout << "# of original points: " << polyData->GetNumberOfPoints() << std::endl;
  vtkSmartPointer<vtkDensifyPointCloudFilter> densify =
    vtkSmartPointer<vtkDensifyPointCloudFilter>::New();
  densify->SetInputData(polyData);
  densify->SetMaximumNumberOfIterations(5);
  densify->SetTargetDistance(maxRange * .03);
  densify->SetNumberOfClosestPoints(10);
  densify->Update();
  std::cout << "# of densified points: " << densify->GetOutput()->GetNumberOfPoints() << std::endl;

  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();
///
  double radius = maxRange * .01;
  vtkSmartPointer<vtkSphereSource> sphereSource1 =
    vtkSmartPointer<vtkSphereSource>::New();
  sphereSource1->SetRadius(radius);

  vtkSmartPointer<vtkGlyph3DMapper> glyph3D1 =
    vtkSmartPointer<vtkGlyph3DMapper>::New();
  glyph3D1->SetInputData(polyData);
  glyph3D1->SetSourceConnection(sphereSource1->GetOutputPort());
  glyph3D1->ScalarVisibilityOff();
  glyph3D1->ScalingOff();

  vtkSmartPointer<vtkActor> glyph3DActor1 =
    vtkSmartPointer<vtkActor>::New();
  glyph3DActor1->SetMapper(glyph3D1);
  glyph3DActor1->GetProperty()->SetColor(colors->GetColor3d("Banana").GetData());

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

  vtkSmartPointer<vtkGlyph3DMapper> glyph3D2 =
    vtkSmartPointer<vtkGlyph3DMapper>::New();
  glyph3D2->SetInputConnection(densify->GetOutputPort());
  glyph3D2->SetSourceConnection(sphereSource2->GetOutputPort());
  glyph3D2->ScalarVisibilityOff();
  glyph3D2->ScalingOff();

  vtkSmartPointer<vtkActor> glyph3DActor2 =
    vtkSmartPointer<vtkActor>::New();
  glyph3DActor2->SetMapper(glyph3D2);
  glyph3DActor2->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());

  // Create graphics stuff
  //
  vtkSmartPointer<vtkRenderer> ren1 =
    vtkSmartPointer<vtkRenderer>::New();
  ren1->SetBackground(colors->GetColor3d("SlateGray").GetData());

  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->GetActiveCamera()->SetPosition (1, 0, 0);
  ren1->GetActiveCamera()->SetFocalPoint (0, 1, 0);
  ren1->GetActiveCamera()->SetViewUp (0, 0, 1);
  ren1->ResetCamera();
  ren1->GetActiveCamera()->Dolly(1.0);
  ren1->ResetCameraClippingRange();

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

  return EXIT_SUCCESS;
}

namespace
{
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(100000);
    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(DensifyPoints)

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

Download and Build DensifyPoints

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

cd DensifyPoints/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:

./DensifyPoints

WINDOWS USERS

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