Silhouette

VTKEx/Cxx/PolyData/Silhouette

Question

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Code

Silhouette.cxx

#include <vtkSmartPointer.h>
#include <vtkPolyDataSilhouette.h>

#include <vtkXMLPolyDataReader.h>
#include <vtkCleanPolyData.h>
#include <vtkProperty.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkCamera.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkSphereSource.h>

#include <vtkNamedColors.h>

int main(int argc, char *argv[])
{
  vtkSmartPointer<vtkPolyData> polyData;
  if (argc < 2)
  {
    vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->Update();

    polyData = sphereSource->GetOutput();
  }
  else
  {
    vtkSmartPointer<vtkXMLPolyDataReader> reader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader->SetFileName(argv[1]);

    vtkSmartPointer<vtkCleanPolyData> clean =
      vtkSmartPointer<vtkCleanPolyData>::New();
    clean->SetInputConnection(reader->GetOutputPort());
    clean->Update();

    polyData = clean->GetOutput();
  }

  vtkSmartPointer<vtkNamedColors> colors =
    vtkSmartPointer<vtkNamedColors>::New();

  //create mapper and actor for original model
  vtkSmartPointer<vtkPolyDataMapper> mapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper->SetInputData(polyData);
  mapper->ScalarVisibilityOff();

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

  //create renderer and renderWindow
  vtkSmartPointer<vtkRenderer> renderer =
    vtkSmartPointer<vtkRenderer>::New();
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->AddRenderer(renderer);

  renderer->AddActor(actor); //view the original model

  //Compute the silhouette
  vtkSmartPointer<vtkPolyDataSilhouette> silhouette =
    vtkSmartPointer<vtkPolyDataSilhouette>::New();
  silhouette->SetInputData(polyData);
  silhouette->SetCamera(renderer->GetActiveCamera());
  silhouette->SetEnableFeatureAngle(0);

  //create mapper and actor for silouette
  vtkSmartPointer<vtkPolyDataMapper> mapper2 =
    vtkSmartPointer<vtkPolyDataMapper>::New();
  mapper2->SetInputConnection(silhouette->GetOutputPort());

  vtkSmartPointer<vtkActor> actor2 =
    vtkSmartPointer<vtkActor>::New();
  actor2->SetMapper(mapper2);
  actor2->GetProperty()->SetColor(colors->GetColor3d("Tomato").GetData());
  actor2->GetProperty()->SetLineWidth(5);

  renderer->AddActor(actor2);
  renderer->SetBackground(colors->GetColor3d("Silver").GetData());
  renderer->ResetCamera();
  renderer->GetActiveCamera()->Azimuth(30);
  renderer->GetActiveCamera()->Elevation(30);
  renderer->GetActiveCamera()->Dolly(1.5);;
  renderer->ResetCameraClippingRange();

  vtkSmartPointer<vtkRenderWindowInteractor> iren =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renderWindow);

  //render and interact
  renderWindow->SetSize(640, 480);
  renderWindow->Render();
  iren->Start();

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(Silhouette)

find_package(VTK COMPONENTS 
  vtkvtkCommonColor
  vtkvtkCommonCore
  vtkvtkCommonDataModel
  vtkvtkFiltersCore
  vtkvtkFiltersHybrid
  vtkvtkFiltersSources
  vtkvtkIOXML
  vtkvtkInteractionStyle
  vtkvtkRenderingContextOpenGL2
  vtkvtkRenderingCore
  vtkvtkRenderingFreeType
  vtkvtkRenderingGL2PSOpenGL2
  vtkvtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping Silhouette: ${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(Silhouette MACOSX_BUNDLE Silhouette.cxx )
  target_link_libraries(Silhouette PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(Silhouette MACOSX_BUNDLE Silhouette.cxx )
  target_link_libraries(Silhouette PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS Silhouette
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build Silhouette

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

cd Silhouette/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:

./Silhouette

WINDOWS USERS

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