QuadricDecimation
VTKExamples/Cxx/Meshes/QuadricDecimation
Code¶
QuadricDecimation.cxx
#include <vtkVersion.h> #include <vtkPolyData.h> #include <vtkSphereSource.h> #include <vtkQuadricDecimation.h> #include <vtkXMLPolyDataReader.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<vtkQuadricDecimation> decimate = vtkSmartPointer<vtkQuadricDecimation>::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(QuadricDecimation) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(QuadricDecimation MACOSX_BUNDLE QuadricDecimation.cxx) target_link_libraries(QuadricDecimation ${VTK_LIBRARIES})
Download and Build QuadricDecimation¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download QuadricDecimation and its CMakeLists.txt file. Once the tarball QuadricDecimation.tar has been downloaded and extracted,
cd QuadricDecimation/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:
./QuadricDecimation
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.