ExtractVisibleCells
VTKExamples/Cxx/Filtering/ExtractVisibleCells
Code¶
ExtractVisibleCells.cxx
#include <vtkVersion.h> #include <vtkSphereSource.h> #include <vtkPolyData.h> #include <vtkSmartPointer.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkHardwareSelector.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkObjectFactory.h> #include <vtkRendererCollection.h> #include <vtkDataSetMapper.h> #include <vtkExtractSelection.h> #include <vtkSelection.h> #include <vtkProperty.h> // Define interaction style class KeyPressInteractorStyle : public vtkInteractorStyleTrackballCamera { public: static KeyPressInteractorStyle* New(); vtkTypeMacro(KeyPressInteractorStyle, vtkInteractorStyleTrackballCamera); virtual void OnKeyPress() { // Get the keypress std::string key = this->Interactor->GetKeySym(); // "s" for "s"elect if(key.compare("s") == 0) { vtkSmartPointer<vtkHardwareSelector> selector = vtkSmartPointer<vtkHardwareSelector>::New(); selector->SetRenderer(this->Interactor->GetRenderWindow()->GetRenderers()->GetFirstRenderer()); int* temp = this->Interactor->GetRenderWindow()->GetSize(); unsigned int windowSize[4]; windowSize[0] = temp[2]; windowSize[1] = temp[3]; windowSize[2] = temp[0]; windowSize[3] = temp[1]; /* for(unsigned int i = 0; i < 4; i++) { windowSize[i] = temp[i]; } */ selector->SetArea(windowSize); selector->SetFieldAssociation(vtkDataObject::FIELD_ASSOCIATION_CELLS); vtkSelection* selection = selector->Select(); std::cout << "Selection has " << selection->GetNumberOfNodes() << " nodes." << std::endl; vtkSmartPointer<vtkExtractSelection> extractSelection = vtkSmartPointer<vtkExtractSelection>::New(); #if VTK_MAJOR_VERSION <= 5 extractSelection->SetInput(0, this->Data); extractSelection->SetInput(1, selection); #else extractSelection->SetInputData(0, this->Data); extractSelection->SetInputData(1, selection); #endif extractSelection->Update(); vtkSmartPointer<vtkDataSetMapper> mapper = vtkSmartPointer<vtkDataSetMapper>::New(); mapper->SetInputConnection(extractSelection->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); actor->GetProperty()->SetColor(1,0,0); this->Renderer->AddActor(actor); } // Forward events vtkInteractorStyleTrackballCamera::OnKeyPress(); } vtkPolyData* Data; vtkRenderer* Renderer; }; vtkStandardNewMacro(KeyPressInteractorStyle); int main(int , char *[]) { // Create a sphere vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetCenter(0.0, 0.0, 0.0); sphereSource->SetRadius(5.0); sphereSource->Update(); // Create a mapper and actor vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(sphereSource->GetOutputPort()); vtkSmartPointer<vtkActor> actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); // Create a renderer, render window, and interactor vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->SetMultiSamples(0); // Turn off anti-aliasing renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); vtkSmartPointer<KeyPressInteractorStyle> style = vtkSmartPointer<KeyPressInteractorStyle>::New(); style->Renderer = renderer; renderWindowInteractor->SetInteractorStyle(style); style->SetCurrentRenderer(renderer); style->Data = sphereSource->GetOutput(); // Add the actor to the scene renderer->AddActor(actor); renderer->SetBackground(.3, .6, .3); // Background color green // Render and interact renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(ExtractVisibleCells) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(ExtractVisibleCells MACOSX_BUNDLE ExtractVisibleCells.cxx) target_link_libraries(ExtractVisibleCells ${VTK_LIBRARIES})
Download and Build ExtractVisibleCells¶
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 ExtractVisibleCells and its CMakeLists.txt file. Once the tarball ExtractVisibleCells.tar has been downloaded and extracted,
cd ExtractVisibleCells/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:
./ExtractVisibleCells
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.