# TransformActorCollection

VTKExamples/Cxx/Visualization/TransformActorCollection

### Code

TransformActorCollection.cxx

    #include <vtkSmartPointer.h>
    #include <vtkConeSource.h>
    #include <vtkSphereSource.h>
    #include <vtkCubeSource.h>
    #include <vtkTransform.h>
    #include <vtkPolyData.h>
    #include <vtkPolyDataMapper.h>
    #include <vtkActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkActorCollection.h>

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

      // Create a cone
      vtkSmartPointer<vtkConeSource> coneSource =
        vtkSmartPointer<vtkConeSource>::New();
      coneSource->SetHeight(3);

      vtkSmartPointer<vtkPolyDataMapper> coneMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      coneMapper->SetInputConnection(coneSource->GetOutputPort());
      vtkSmartPointer<vtkActor> coneActor =
        vtkSmartPointer<vtkActor>::New();
      coneActor->SetMapper(coneMapper);

      // Create a cube
      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);

      // Create a sphere
      vtkSmartPointer<vtkSphereSource> sphereSource =
        vtkSmartPointer<vtkSphereSource>::New();

      vtkSmartPointer<vtkPolyDataMapper> sphereMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      sphereMapper->SetInputConnection(sphereSource->GetOutputPort());
      vtkSmartPointer<vtkActor> sphereActor =
        vtkSmartPointer<vtkActor>::New();
      sphereActor->SetMapper(sphereMapper);
      renderer->AddActor(sphereActor);

      vtkSmartPointer<vtkActorCollection> actorCollection =
        vtkSmartPointer<vtkActorCollection>::New();
      actorCollection->AddItem(cubeActor);
      actorCollection->AddItem(coneActor);
      actorCollection->InitTraversal();

      vtkSmartPointer<vtkTransform> transform =
        vtkSmartPointer<vtkTransform>::New();
      transform->PostMultiply(); //this is the key line
      transform->Translate(5.0, 0, 0);

      //actorCollection->SetUserTransform(transform);

      for(vtkIdType i = 0; i < actorCollection->GetNumberOfItems(); i++)
      {
        vtkActor* actor = actorCollection->GetNextActor();
        actor->SetUserTransform(transform);
        renderer->AddActor(actor);
      }

      // Create a renderer, render window, and interactor

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

      // Add the actor to the scene
      renderer->SetBackground(.2, .3, .4);

      // Render and interact
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(TransformActorCollection)

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

    add_executable(TransformActorCollection MACOSX_BUNDLE TransformActorCollection.cxx )

    target_link_libraries(TransformActorCollection ${VTK_LIBRARIES})

### Download and Build TransformActorCollection

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

    cd TransformActorCollection/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:

    ./TransformActorCollection

WINDOWS USERS

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