LightActor

VTKExamples/Cxx/Lighting/LightActor


Other Languages

See (Java)

Question

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Code

LightActor.cxx

#include <cstdlib>

#include <vtkRenderer.h>
#include <vtkRenderWindow.h>
#include <vtkLightActor.h>
#include <vtkLight.h>
#include <vtkSmartPointer.h>
#include <vtkRenderWindowInteractor.h>

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

  // Display where the light is
  vtkSmartPointer<vtkLight> light = vtkSmartPointer<vtkLight>::New();
  light->SetPositional(true); // without this line, the program crashes
  vtkSmartPointer<vtkLightActor> lightActor = vtkSmartPointer<vtkLightActor>::New();
  lightActor->SetLight(light);
  renderer->AddViewProp(lightActor);

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

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

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

  return EXIT_SUCCESS;
}

CMakeLists.txt

cmake_minimum_required(VERSION 3.3 FATAL_ERROR)

project(LightActor)

find_package(VTK COMPONENTS 
  vtkCommonCore
  vtkInteractionStyle
  vtkRenderingCore
  vtkRenderingFreeType
  vtkRenderingOpenGL2 QUIET)
if (NOT VTK_FOUND)
  message("Skipping LightActor: ${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(LightActor MACOSX_BUNDLE LightActor.cxx )
  target_link_libraries(LightActor PRIVATE ${VTK_LIBRARIES})
else ()
  # include all components
  add_executable(LightActor MACOSX_BUNDLE LightActor.cxx )
  target_link_libraries(LightActor PRIVATE ${VTK_LIBRARIES})
  # vtk_module_autoinit is needed
  vtk_module_autoinit(
    TARGETS LightActor
    MODULES ${VTK_LIBRARIES}
    )
endif () 

Download and Build LightActor

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

cd LightActor/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:

./LightActor

WINDOWS USERS

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