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
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.