RotatingSphere
VTKExamples/Cxx/Animation/RotatingSphere
Description¶
This example demonstrates how to create a rotating sphere. A timer is used to rotate a sphere along z-axis.
Question
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Code¶
RotatingSphere.cxx
#include <vtkActor.h> #include <vtkNamedColors.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkRenderer.h> #include <vtkSmartPointer.h> #include <vtkSphereSource.h> class vtkTimerCallback2 : public vtkCommand { public: vtkTimerCallback2() = default; ~vtkTimerCallback2() = default; int timerId = 0; static vtkTimerCallback2* New() { vtkTimerCallback2* cb = new vtkTimerCallback2; cb->TimerCount = 0; return cb; } virtual void Execute(vtkObject* caller, unsigned long eventId, void* vtkNotUsed(callData)) { vtkRenderWindowInteractor* iren = dynamic_cast<vtkRenderWindowInteractor*>(caller); if (vtkCommand::TimerEvent == eventId) { ++this->TimerCount; } if (TimerCount < 36) { actor->RotateZ(5); iren->GetRenderWindow()->Render(); } else { iren->DestroyTimer(); } } private: int TimerCount = 0; public: vtkActor* actor; }; int main(int, char*[]) { auto colors = vtkSmartPointer<vtkNamedColors>::New(); // Create a sphere auto sphereSource = vtkSmartPointer<vtkSphereSource>::New(); sphereSource->SetCenter(0.0, 0.0, 0.0); sphereSource->SetRadius(1.0); sphereSource->SetThetaResolution(15); sphereSource->SetPhiResolution(15); sphereSource->Update(); // Create a mapper and actor auto mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection(sphereSource->GetOutputPort()); auto actor = vtkSmartPointer<vtkActor>::New(); actor->SetMapper(mapper); actor->RotateX(90); actor->GetProperty()->SetRepresentationToWireframe(); // Create a renderer, render window, and interactor auto renderer = vtkSmartPointer<vtkRenderer>::New(); auto renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); renderWindow->SetSize(640, 480); auto renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); // Add the actor to the scene renderer->AddActor(actor); renderer->SetBackground(colors->GetColor3d("Seashell").GetData()); // Render and interact renderWindow->Render(); // Initialize must be called prior to creating timer events. renderWindowInteractor->Initialize(); // Sign up to receive TimerEvent auto cb = vtkSmartPointer<vtkTimerCallback2>::New(); cb->actor = actor; renderWindowInteractor->AddObserver(vtkCommand::TimerEvent, cb); int timerId = renderWindowInteractor->CreateRepeatingTimer(100); cb->timerId = timerId; // Start the interaction and timer renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 3.3 FATAL_ERROR) project(RotatingSphere) find_package(VTK COMPONENTS vtkCommonColor vtkCommonCore vtkFiltersSources vtkInteractionStyle vtkRenderingContextOpenGL2 vtkRenderingCore vtkRenderingFreeType vtkRenderingGL2PSOpenGL2 vtkRenderingOpenGL2 QUIET) if (NOT VTK_FOUND) message("Skipping RotatingSphere: ${VTK_NOT_FOUND_MESSAGE}") return () endif() message (STATUS "VTK_VERSION: ${VTK_VERSION}") if (VTK_VERSION VERSION_LESS "8.90.0") # old system include(${VTK_USE_FILE}) add_executable(RotatingSphere MACOSX_BUNDLE RotatingSphere.cxx ) target_link_libraries(RotatingSphere PRIVATE ${VTK_LIBRARIES}) else () # include all components add_executable(RotatingSphere MACOSX_BUNDLE RotatingSphere.cxx ) target_link_libraries(RotatingSphere PRIVATE ${VTK_LIBRARIES}) # vtk_module_autoinit is needed vtk_module_autoinit( TARGETS RotatingSphere MODULES ${VTK_LIBRARIES} ) endif ()
Download and Build RotatingSphere¶
Click here to download RotatingSphere and its CMakeLists.txt file. Once the tarball RotatingSphere.tar has been downloaded and extracted,
cd RotatingSphere/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:
./RotatingSphere
WINDOWS USERS
Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.