VTK/Examples/Cxx/Meshes/QuadricClustering

From KitwarePublic
< VTK‎ | Examples‎ | Cxx
Jump to: navigation, search
VTK Examples Baseline Meshes TestQuadricClustering.png

QuadricClustering.cxx

#include <vtkVersion.h>
#include <vtkPolyData.h>
#include <vtkSphereSource.h>
#include <vtkXMLPolyDataReader.h>
#include <vtkQuadricClustering.h>
#include <vtkSmartPointer.h>
#include <vtkPolyDataMapper.h>
#include <vtkProperty.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkCamera.h>
 
int main(int argc, char *argv[])
{
  vtkSmartPointer<vtkPolyData> inputPolyData;
  if(argc > 1)
    {
    vtkSmartPointer<vtkXMLPolyDataReader> reader =
      vtkSmartPointer<vtkXMLPolyDataReader>::New();
    reader->SetFileName(argv[1]);
    reader->Update();
    inputPolyData = reader->GetOutput();
    }
  else
    {
    vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->SetThetaResolution(30);
    sphereSource->SetPhiResolution(15);
    sphereSource->Update();
    inputPolyData = sphereSource->GetOutput();
    }
 
  std::cout << "Before decimation" << std::endl << "------------" << std::endl;
  std::cout << "There are "
            << inputPolyData->GetNumberOfPoints() << " points." << std::endl;
  std::cout << "There are "
            << inputPolyData->GetNumberOfPolys() << " polygons." << std::endl;
 
  vtkSmartPointer<vtkQuadricClustering> decimate =
    vtkSmartPointer<vtkQuadricClustering>::New();
#if VTK_MAJOR_VERSION <= 5
  decimate->SetInputConnection(inputPolyData->GetProducerPort());
#else
  decimate->SetInputData(inputPolyData);
#endif
  decimate->Update();
 
  vtkSmartPointer<vtkPolyData> decimated =
    vtkSmartPointer<vtkPolyData>::New();
  decimated->ShallowCopy(decimate->GetOutput());
 
  std::cout << "After decimation" << std::endl << "------------" << std::endl;
 
  std::cout << "There are "
            << decimated->GetNumberOfPoints() << " points." << std::endl;
  std::cout << "There are "
            << decimated->GetNumberOfPolys() << " polygons." << std::endl;
 
  vtkSmartPointer<vtkPolyDataMapper> inputMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  inputMapper->SetInputConnection(inputPolyData->GetProducerPort());
#else
  inputMapper->SetInputData(inputPolyData);
#endif
  vtkSmartPointer<vtkActor> inputActor =
    vtkSmartPointer<vtkActor>::New();
  inputActor->SetMapper(inputMapper);
  inputActor->GetProperty()->SetInterpolationToFlat();
 
  vtkSmartPointer<vtkPolyDataMapper> decimatedMapper =
    vtkSmartPointer<vtkPolyDataMapper>::New();
#if VTK_MAJOR_VERSION <= 5
  decimatedMapper->SetInputConnection(decimated->GetProducerPort());
#else
  decimatedMapper->SetInputData(decimated);
#endif
  vtkSmartPointer<vtkActor> decimatedActor =
    vtkSmartPointer<vtkActor>::New();
  decimatedActor->SetMapper(decimatedMapper);
 
  // There will be one render window
  vtkSmartPointer<vtkRenderWindow> renderWindow =
    vtkSmartPointer<vtkRenderWindow>::New();
  renderWindow->SetSize(600, 300);
 
  // And one interactor
  vtkSmartPointer<vtkRenderWindowInteractor> interactor =
    vtkSmartPointer<vtkRenderWindowInteractor>::New();
  interactor->SetRenderWindow(renderWindow);
 
  // Define viewport ranges
  // (xmin, ymin, xmax, ymax)
  double leftViewport[4] = {0.0, 0.0, 0.5, 1.0};
  double rightViewport[4] = {0.5, 0.0, 1.0, 1.0};
 
  // Setup both renderers
  vtkSmartPointer<vtkRenderer> leftRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(leftRenderer);
  leftRenderer->SetViewport(leftViewport);
  leftRenderer->SetBackground(.6, .5, .4);
 
  vtkSmartPointer<vtkRenderer> rightRenderer =
    vtkSmartPointer<vtkRenderer>::New();
  renderWindow->AddRenderer(rightRenderer);
  rightRenderer->SetViewport(rightViewport);
  rightRenderer->SetBackground(.4, .5, .6);
 
  // Add the sphere to the left and the cube to the right
  leftRenderer->AddActor(inputActor);
  rightRenderer->AddActor(decimatedActor);
 
  vtkSmartPointer<vtkCamera> camera =
    vtkSmartPointer<vtkCamera>::New();
  leftRenderer->SetActiveCamera(camera);
  rightRenderer->SetActiveCamera(camera);
 
  leftRenderer->ResetCamera();
 
  renderWindow->Render();
  interactor->Start();
 
  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 2.8)
 
PROJECT(QuadricClustering)
 
find_package(VTK REQUIRED)
include(${VTK_USE_FILE})
 
add_executable(QuadricClustering MACOSX_BUNDLE QuadricClustering.cxx)
 
if(VTK_LIBRARIES)
  target_link_libraries(QuadricClustering ${VTK_LIBRARIES})
else()
  target_link_libraries(QuadricClustering vtkHybrid vtkWidgets)
endif()

Download and Build QuadricClustering

Click here to download QuadricClustering. and its CMakeLists.txt file.

Once the tarball QuadricClustering.tar has been downloaded and extracted,

cd QuadricClustering/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:

./QuadricClustering

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.