Follower
VTKExamples/Cxx/Visualization/Follower
Description¶
The text is a 3D actor and is placed in 3D space, but stays right side up and facing the camera, while the cube does not.
Code¶
Follower.cxx
#include <vtkActor.h> #include <vtkCubeSource.h> #include <vtkFollower.h> #include <vtkInteractorStyle.h> #include <vtkPolyData.h> #include <vtkPolyDataMapper.h> #include <vtkProperty.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkRenderWindowInteractor.h> #include <vtkSmartPointer.h> #include <vtkVectorText.h> int main(int, char *[]) { // Create some text vtkSmartPointer<vtkVectorText> textSource = vtkSmartPointer<vtkVectorText>::New(); textSource->SetText( "Hello" ); // Create a mapper vtkSmartPointer<vtkPolyDataMapper> mapper = vtkSmartPointer<vtkPolyDataMapper>::New(); mapper->SetInputConnection( textSource->GetOutputPort() ); // Create a subclass of vtkActor: a vtkFollower that remains facing the camera vtkSmartPointer<vtkFollower> follower = vtkSmartPointer<vtkFollower>::New(); follower->SetMapper( mapper ); follower->GetProperty()->SetColor( 1, 0, 0 ); // red // Create a transparent cube that does not move around to face the camera vtkSmartPointer<vtkCubeSource> cubeSource = vtkSmartPointer<vtkCubeSource>::New(); vtkSmartPointer<vtkPolyDataMapper> cubeMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); cubeMapper->SetInputConnection( cubeSource->GetOutputPort() ); vtkSmartPointer<vtkActor> cubeActor = vtkSmartPointer<vtkActor>::New(); cubeActor->SetMapper( cubeMapper ); cubeActor->GetProperty()->SetColor( 0, 0, 1 ); // blue cubeActor->GetProperty()->SetOpacity( 0.3 ); // 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(); vtkInteractorStyle::SafeDownCast(renderWindowInteractor->GetInteractorStyle())->AutoAdjustCameraClippingRangeOn(); renderWindowInteractor->SetRenderWindow( renderWindow ); // Add the actor to the scene renderer->AddActor( follower ); renderer->AddActor( cubeActor ); renderer->SetBackground( 1, 1, 1 ); // Background color white follower->SetCamera( renderer->GetActiveCamera() ); // Render and interact renderWindow->Render(); renderer->ResetCamera(); renderWindow->Render(); renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(Follower) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(Follower MACOSX_BUNDLE Follower.cxx) target_link_libraries(Follower ${VTK_LIBRARIES})
Download and Build Follower¶
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 Follower and its CMakeLists.txt file. Once the tarball Follower.tar has been downloaded and extracted,
cd Follower/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:
./Follower
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.