VectorOfActors

VTKExamples/Cxx/Visualization/VectorOfActors

Description

This example creates multiple actors and stores them in a vector. The resulting image is 10 spheres in a line.

Code

VectorOfActors.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>
#include <vtkInteractorStyleTrackball.h>

#include <vector>

int main(int, char *[])
{
  std::vector<vtkSmartPointer<vtkActor> > actors;

  for(unsigned int i = 0; i < 10; i++)
  {
    vtkSmartPointer<vtkSphereSource> sphereSource =
      vtkSmartPointer<vtkSphereSource>::New();
    sphereSource->SetCenter(i, 0.0, 0.0);
    sphereSource->SetRadius(.2);

    vtkSmartPointer<vtkPolyDataMapper> mapper =
      vtkSmartPointer<vtkPolyDataMapper>::New();
    mapper->SetInputConnection(sphereSource->GetOutputPort());

    vtkSmartPointer<vtkActor> actor =
      vtkSmartPointer<vtkActor>::New();
    actor->SetMapper(mapper);

    actors.push_back(actor);
  }


  // 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
  for(unsigned int i = 0; i < actors.size(); i++)
  {
    renderer->AddActor(actors[i]);
  }

  renderer->SetBackground(1,1,1); // Background color white

  // Render
  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 3.3 FATAL_ERROR)

project(VectorOfActors)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping VectorOfActors: ${VTK_NOT_FOUND_MESSAGE}")
  return ()
endif()
message (STATUS "VTK_VERSION: ${VTK_VERSION}")
if (VTK_VERSION VERSION_LESS "8.90.0")
  # old system
  include(${VTK_USE_FILE})
  add_executable(VectorOfActors MACOSX_BUNDLE VectorOfActors.cxx )
  target_link_libraries(VectorOfActors PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(VectorOfActors MACOSX_BUNDLE VectorOfActors.cxx )
  target_link_libraries(VectorOfActors PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS VectorOfActors
    MODULES ${VTK_LIBRARIES}
    )
endif ()

Download and Build VectorOfActors

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

cd VectorOfActors/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:

./VectorOfActors

WINDOWS USERS

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