VTK/Examples/Cxx/Visualization/TransformActorCollection

#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;
}