PolyDataConnectivityFilter LargestRegion
VTKExamples/Cxx/PolyData/PolyDataConnectivityFilter_LargestRegion
Description¶
This example keeps the largest connected region of a mesh. Note that this is based on the number of points, not the actual area of the region.
- Contributed by: Jinyoung Hwang
Code¶
PolyDataConnectivityFilter_LargestRegion.cxx
#include <vtkSmartPointer.h> #include <vtkSphereSource.h> #include <vtkPolyDataConnectivityFilter.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkProperty.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkAppendPolyData.h> int main(int, char *[]) { // Small sphere vtkSmartPointer<vtkSphereSource> sphereSource1 = vtkSmartPointer<vtkSphereSource>::New(); sphereSource1->Update(); // Large sphere vtkSmartPointer<vtkSphereSource> sphereSource2 = vtkSmartPointer<vtkSphereSource>::New(); sphereSource2->SetRadius(10); sphereSource2->SetCenter(25,0,0); sphereSource2->SetThetaResolution(10); sphereSource2->SetPhiResolution(10); sphereSource2->Update(); vtkSmartPointer<vtkAppendPolyData> appendFilter = vtkSmartPointer<vtkAppendPolyData>::New(); appendFilter->AddInputConnection(sphereSource1->GetOutputPort()); appendFilter->AddInputConnection(sphereSource2->GetOutputPort()); appendFilter->Update(); vtkSmartPointer<vtkPolyDataConnectivityFilter> connectivityFilter = vtkSmartPointer<vtkPolyDataConnectivityFilter>::New(); connectivityFilter->SetInputConnection(appendFilter->GetOutputPort()); connectivityFilter->SetExtractionModeToLargestRegion(); connectivityFilter->Update(); // Create a mapper and actor for original data vtkSmartPointer<vtkPolyDataMapper> originalMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); originalMapper->SetInputConnection(appendFilter->GetOutputPort()); originalMapper->Update(); vtkSmartPointer<vtkActor> originalActor = vtkSmartPointer<vtkActor>::New(); originalActor->SetMapper(originalMapper); // Create a mapper and actor for extracted data vtkSmartPointer<vtkPolyDataMapper> extractedMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); extractedMapper->SetInputConnection(connectivityFilter->GetOutputPort()); extractedMapper->Update(); vtkSmartPointer<vtkActor> extractedActor = vtkSmartPointer<vtkActor>::New(); extractedActor->GetProperty()->SetColor(1,0,0); extractedActor->SetMapper(extractedMapper); // Visualization vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(originalActor); renderer->AddActor(extractedActor); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> interactor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); interactor->SetRenderWindow(renderWindow); interactor->Initialize(); interactor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(PolyDataConnectivityFilter_LargestRegion) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(PolyDataConnectivityFilter_LargestRegion MACOSX_BUNDLE PolyDataConnectivityFilter_LargestRegion.cxx) target_link_libraries(PolyDataConnectivityFilter_LargestRegion ${VTK_LIBRARIES})
Download and Build PolyDataConnectivityFilter_LargestRegion¶
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Click here to download PolyDataConnectivityFilter_LargestRegion and its CMakeLists.txt file. Once the tarball PolyDataConnectivityFilter_LargestRegion.tar has been downloaded and extracted,
cd PolyDataConnectivityFilter_LargestRegion/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:
./PolyDataConnectivityFilter_LargestRegion
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.