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VectorOfActors

vtk-examples/Cxx/Visualization/VectorOfActors

Description

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

Question

If you have a question about this example, please use the VTK Discourse Forum

Code

VectorOfActors.cxx

#include <vtkActor.h>
#include <vtkInteractorStyleTrackball.h>
#include <vtkInteractorStyleTrackballCamera.h>
#include <vtkNew.h>
#include <vtkPolyData.h>
#include <vtkPolyDataMapper.h>
#include <vtkRenderWindow.h>
#include <vtkRenderWindowInteractor.h>
#include <vtkRenderer.h>
#include <vtkSmartPointer.h>
#include <vtkSphereSource.h>
#include <vtkNamedColors.h>
#include <vtkNew.h>
#include <vtkProperty.h>


#include <vector>

int main(int, char*[])
{
  vtkNew<vtkNamedColors> colors;

  std::vector<vtkSmartPointer<vtkActor>> actors;

  for (unsigned int i = 0; i < 10; i++)
  {
    vtkNew<vtkSphereSource> sphereSource;
    sphereSource->SetCenter(i, 0.0, 0.0);
    sphereSource->SetRadius(0.2);

    vtkNew<vtkPolyDataMapper> mapper;
    mapper->SetInputConnection(sphereSource->GetOutputPort());

    vtkNew<vtkActor> actor;
    actor->SetMapper(mapper);
    actor->GetProperty()->SetColor(colors->GetColor3d("MistyRose").GetData());

    actors.push_back(actor);
  }

  // A renderer and render window
  vtkNew<vtkRenderer> renderer;
  vtkNew<vtkRenderWindow> renderWindow;
  renderWindow->AddRenderer(renderer);
  renderWindow->SetWindowName("VectorOfActors");

  // An interactor
  vtkNew<vtkRenderWindowInteractor> renderWindowInteractor;
  renderWindowInteractor->SetRenderWindow(renderWindow);

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

  renderer->SetBackground(colors->GetColor3d("DarkSlateGray").GetData());

  // Render
  renderWindow->Render();

  vtkNew<vtkInteractorStyleTrackballCamera> style;

  renderWindowInteractor->SetInteractorStyle(style);

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.12 FATAL_ERROR)

project(VectorOfActors)

find_package(VTK COMPONENTS 
  vtkCommonColor
  vtkCommonCore
  vtkCommonDataModel
  vtkFiltersSources
  vtkInteractionStyle
  vtkRenderingContextOpenGL2
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingGL2PSOpenGL2
  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()
  # Prevent a "command line is too long" failure in Windows.
  set(CMAKE_NINJA_FORCE_RESPONSE_FILE "ON" CACHE BOOL "Force Ninja to use response files.")
  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.