# CameraActor

VTKExamples/Cxx/Visualization/CameraActor

### Code

CameraActor.cxx

    #include <vtkSmartPointer.h>
    #include <vtkCameraActor.h>

    #include <vtkNamedColors.h>
    #include <vtkSphereSource.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkCamera.h>
    #include <vtkPlanes.h>
    #include <vtkMapper.h>
    #include <vtkProperty.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>

    int main(int, char *[])
    {
      vtkSmartPointer<vtkNamedColors> namedColors =
        vtkSmartPointer<vtkNamedColors>::New();

      // Sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      sphereSource->SetRadius(400);
      sphereSource->Update();

      vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> sphereActor =
        vtkSmartPointer<vtkActor>::New();
      sphereActor->SetMapper(sphereMapper);
      sphereActor->GetProperty()->SetDiffuseColor(
        namedColors->GetColor3d("Tomato").GetData());

      // Camera
      vtkSmartPointer<vtkCamera> camera =
        vtkSmartPointer<vtkCamera>::New();

      vtkSmartPointer<vtkCameraActor> cameraActor =
        vtkSmartPointer<vtkCameraActor>::New();
      cameraActor->SetCamera(camera);
      cameraActor->GetProperty()->SetColor(0, 0, 0);

      // (Xmin,Xmax,Ymin,Ymax,Zmin,Zmax).
      double* bounds = new double[6];
      bounds = cameraActor->GetBounds();
      std::cout << "bounds: " << bounds[0] << " " << bounds[1] << " " << bounds[2] << " " <<
          bounds[3] << " " << bounds[4] << " " << bounds[5] << std::endl;

      // Visualize
      vtkSmartPointer<vtkRenderer> renderer =
        vtkSmartPointer<vtkRenderer>::New();
      vtkSmartPointer<vtkRenderWindow> renderWindow =
        vtkSmartPointer<vtkRenderWindow>::New();
      renderWindow->AddRenderer(renderer);

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

      renderer->AddActor(sphereActor);
      // Compute the active camera parameters
      renderer->ResetCamera();

      // Set the camera parameters for the camera actor
      camera->DeepCopy(renderer->GetActiveCamera());
      renderer->AddActor(cameraActor);

      // Position the camera so that we can see the camera actor
      renderer->GetActiveCamera()->SetPosition(1, 0, 0);
      renderer->GetActiveCamera()->SetFocalPoint(0, 0, 0);
      renderer->GetActiveCamera()->SetViewUp(0, 1, 0);
      renderer->GetActiveCamera()->Azimuth(30);
      renderer->GetActiveCamera()->Elevation(30);

      renderer->ResetCamera();
      renderer->SetBackground(namedColors->GetColor3d("SlateGray").GetData());

      renderWindow->Render();
      renderWindowInteractor->Start();

     return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(CameraActor)

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

    add_executable(CameraActor MACOSX_BUNDLE CameraActor.cxx )

    target_link_libraries(CameraActor ${VTK_LIBRARIES})

### Download and Build CameraActor

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

    cd CameraActor/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:

    ./CameraActor

WINDOWS USERS

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