PolyDataConnectivityFilter SpecifiedRegion
VTKExamples/Cxx/PolyData/PolyDataConnectivityFilter_SpecifiedRegion
Description¶
This example creates two spheres and combines them together into one polydata. The vtkPolyDataConnectivityFilter is used to find the two spheres as they are separate regions (disconnected). If region 0 is selected, the small sphere is extracted. If region 1 is selected, the large sphere is extracted.
Code¶
PolyDataConnectivityFilter_SpecifiedRegion.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 *[]) { vtkSmartPointer<vtkSphereSource> sphereSource1 = vtkSmartPointer<vtkSphereSource>::New(); sphereSource1->Update(); vtkSmartPointer<vtkSphereSource> sphereSource2 = vtkSmartPointer<vtkSphereSource>::New(); sphereSource2->SetRadius(10); sphereSource2->SetCenter(25,0,0); 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->SetExtractionModeToSpecifiedRegions(); connectivityFilter->AddSpecifiedRegion(1); //select the region to extract here 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); // create a renderer vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); renderer->AddActor(originalActor); renderer->AddActor(extractedActor); // create a render window vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); // create an interactor 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_SpecifiedRegion) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(PolyDataConnectivityFilter_SpecifiedRegion MACOSX_BUNDLE PolyDataConnectivityFilter_SpecifiedRegion.cxx) target_link_libraries(PolyDataConnectivityFilter_SpecifiedRegion ${VTK_LIBRARIES})
Download and Build PolyDataConnectivityFilter_SpecifiedRegion¶
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Click here to download PolyDataConnectivityFilter_SpecifiedRegion and its CMakeLists.txt file. Once the tarball PolyDataConnectivityFilter_SpecifiedRegion.tar has been downloaded and extracted,
cd PolyDataConnectivityFilter_SpecifiedRegion/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_SpecifiedRegion
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.