SelectVisiblePoints
VTKExamples/Cxx/PolyData/SelectVisiblePoints
Description¶
This example demonstrates how to determine which objects are visible.
Code¶
SelectVisiblePoints.cxx
#include <vtkPolyData.h> #include <vtkPointSource.h> #include <vtkSphereSource.h> #include <vtkSmartPointer.h> #include <vtkSelectVisiblePoints.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkRenderWindow.h> #include <vtkRenderer.h> #include <vtkRenderWindowInteractor.h> #include <vtkInteractorStyleTrackballCamera.h> #include <vtkObjectFactory.h> class MyInteractor : public vtkInteractorStyleTrackballCamera { public: static MyInteractor* New(); vtkTypeMacro(MyInteractor, vtkInteractorStyleTrackballCamera); virtual void OnLeftButtonDown() { this->VisibleFilter->Update(); std::cout << "There are currently: " << this->VisibleFilter->GetOutput()->GetNumberOfPoints() << " visible." << std::endl; // Forward events vtkInteractorStyleTrackballCamera::OnLeftButtonDown(); } void SetVisibleFilter(vtkSmartPointer<vtkSelectVisiblePoints> vis) {this->VisibleFilter = vis;} private: vtkSmartPointer<vtkSelectVisiblePoints> VisibleFilter; }; vtkStandardNewMacro(MyInteractor); int main(int, char *[]) { vtkSmartPointer<vtkSphereSource> sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetCenter(5.0, 0, 0); sphereSource->Update(); vtkSmartPointer<vtkPointSource> pointSource = vtkSmartPointer<vtkPointSource>::New(); pointSource->SetRadius(2.0); pointSource->SetNumberOfPoints(200); pointSource->Update(); // Create an actor and mapper vtkSmartPointer<vtkPolyDataMapper> sphereMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); sphereMapper->SetInputConnection(sphereSource->GetOutputPort()); vtkSmartPointer<vtkActor> sphereActor = vtkSmartPointer<vtkActor>::New(); sphereActor->SetMapper(sphereMapper); vtkSmartPointer<vtkPolyDataMapper> pointsMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); pointsMapper->SetInputConnection(pointSource->GetOutputPort()); vtkSmartPointer<vtkActor> pointsActor = vtkSmartPointer<vtkActor>::New(); pointsActor->SetMapper(pointsMapper); // Create a renderer, render window, and interactor vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); // Add the actors to the scene renderer->AddActor(sphereActor); renderer->AddActor(pointsActor); vtkSmartPointer<vtkSelectVisiblePoints> selectVisiblePoints = vtkSmartPointer<vtkSelectVisiblePoints>::New(); selectVisiblePoints->SetInputConnection(pointSource->GetOutputPort()); selectVisiblePoints->SetRenderer(renderer); selectVisiblePoints->Update(); vtkSmartPointer<MyInteractor> style = vtkSmartPointer<MyInteractor>::New(); renderWindowInteractor->SetInteractorStyle( style ); style->SetVisibleFilter(selectVisiblePoints); // Render and interact renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(SelectVisiblePoints) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(SelectVisiblePoints MACOSX_BUNDLE SelectVisiblePoints.cxx) target_link_libraries(SelectVisiblePoints ${VTK_LIBRARIES})
Download and Build SelectVisiblePoints¶
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 SelectVisiblePoints and its CMakeLists.txt file. Once the tarball SelectVisiblePoints.tar has been downloaded and extracted,
cd SelectVisiblePoints/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:
./SelectVisiblePoints
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.