VTK/Examples/Cxx/PolyData/Silhouette

Silhouette.cxx

#include <vtkVersion.h>
#include <vtkSmartPointer.h>
#include <vtkProperty.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkActor.h>
#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkPolyDataSilhouette.h>
#include <vtkSphereSource.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkCleanPolyData.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();
    }
      
  //create mapper and actor for original model
  vtkSmartPointer<vtkPolyDataMapper> mapper = 
    vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  mapper->SetInput(polyData);
#else
  mapper->SetInputData(polyData);
#endif

  vtkSmartPointer<vtkActor> actor =
    vtkSmartPointer<vtkActor>::New();
  actor->SetMapper(mapper);
  actor->GetProperty()->SetInterpolationToFlat();
  
  //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();
#if VTK_MAJOR_VERSION <= 5
  silhouette->SetInput(polyData);
#else
  silhouette->SetInputData(polyData);
#endif
  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(1.0, 0.3882, 0.2784); // tomato
  actor2->GetProperty()->SetLineWidth(5);
  renderer->AddActor(actor2);
  renderer->SetBackground(.1, .2, .3);
  renderer->ResetCamera();
  
  //you MUST NOT call renderWindow->Render() before
  //iren->SetRenderWindow(renderWindow);
  vtkSmartPointer<vtkRenderWindowInteractor> iren = 
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  iren->SetRenderWindow(renderWindow);
  
  //render and interact
  renderWindow->Render();
  iren->Start();

  return EXIT_SUCCESS;
}

Please try the new VTKExamples website.

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)

PROJECT(Silhouette)

find_package(VTK REQUIRED)
include(${VTK_USE_FILE})

add_executable(Silhouette MACOSX_BUNDLE Silhouette.cxx)

if(VTK_LIBRARIES)
  target_link_libraries(Silhouette ${VTK_LIBRARIES})
else()
  target_link_libraries(Silhouette vtkHybrid vtkWidgets)
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 PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.