# MoveCamera

VTKExamples/Cxx/Visualization/MoveCamera

### Description

This example creates two spheres. They will move together when the mouse is used to interact with the scene because the camera is actually what is moving causing the view of the spheres to change.

### Code

MoveCamera.cxx

    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkPolyData.h>
    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>
    #include <vtkInteractorStyleTrackballCamera.h>

    int main (int, char *[])
    {
      // Sphere 1
      vtkSmartPointer<vtkSphereSource> sphereSource1 =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource1->SetCenter(0.0, 0.0, 0.0);
      sphereSource1->SetRadius(4.0);
      sphereSource1->Update();

      vtkSmartPointer<vtkPolyDataMapper> mapper1 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper1->SetInputConnection(sphereSource1->GetOutputPort());

      vtkSmartPointer<vtkActor> actor1 =
        vtkSmartPointer<vtkActor>::New();
      actor1->SetMapper(mapper1);

      // Sphere 2
      vtkSmartPointer<vtkSphereSource> sphereSource2 =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource2->SetCenter(10.0, 0.0, 0.0);
      sphereSource2->SetRadius(3.0);
      sphereSource2->Update();

      // Create a mapper
      vtkSmartPointer<vtkPolyDataMapper> mapper2 =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      mapper2->SetInputConnection(sphereSource2->GetOutputPort());

      // Create an actor
      vtkSmartPointer<vtkActor> actor2 =
        vtkSmartPointer<vtkActor>::New();
      actor2->SetMapper(mapper2);

      // A renderer and render window
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);

      // An interactor
      vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor =
        vtkSmartPointer<vtkRenderWindowInteractor>::New();
      renderWindowInteractor->SetRenderWindow(renderWindow);

      // Add the actors to the scene
      renderer->AddActor(actor1);
      renderer->AddActor(actor2);
      renderer->SetBackground(1,1,1); // Background color white

      // Render an image (lights and cameras are created automatically)
      renderWindow->Render();

      vtkSmartPointer<vtkInteractorStyleTrackballCamera> style =
        vtkSmartPointer<vtkInteractorStyleTrackballCamera>::New();

      renderWindowInteractor->SetInteractorStyle( style );

      // Begin mouse interaction
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(MoveCamera)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(MoveCamera MACOSX_BUNDLE MoveCamera.cxx )

    target_link_libraries(MoveCamera ${VTK_LIBRARIES})

### Download and Build MoveCamera

Click here to download MoveCamera and its CMakeLists.txt file. Once the tarball MoveCamera.tar has been downloaded and extracted,

    cd MoveCamera/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:

    ./MoveCamera

WINDOWS USERS

Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.