Light
VTKExamples/Cxx/Lighting/Light
Code¶
Light.cxx
#include <cstdlib> #include <vtkVersion.h> #include <vtkLightCollection.h> #include <vtkProperty.h> #include <vtkRenderer.h> #include <vtkRenderWindow.h> #include <vtkPlaneSource.h> #include <vtkSphereSource.h> #include <vtkPolyDataMapper.h> #include <vtkActor.h> #include <vtkLight.h> #include <vtkLightActor.h> #include <vtkSmartPointer.h> #include <vtkRenderWindowInteractor.h> int main(int, char *[]) { vtkSmartPointer<vtkRenderer> renderer = vtkSmartPointer<vtkRenderer>::New(); double lightPosition[3] = {0, 0, 1}; // Create a light double lightFocalPoint[3] = {0,0,0}; vtkSmartPointer<vtkLight> light = vtkSmartPointer<vtkLight>::New(); light->SetLightTypeToSceneLight(); light->SetPosition(lightPosition[0], lightPosition[1], lightPosition[2]); light->SetPositional(true); // required for vtkLightActor below light->SetConeAngle(10); light->SetFocalPoint(lightFocalPoint[0], lightFocalPoint[1], lightFocalPoint[2]); light->SetDiffuseColor(1,0,0); light->SetAmbientColor(0,1,0); light->SetSpecularColor(0,0,1); vtkLightCollection* originalLights = renderer->GetLights(); std::cout << "Originally there are " << originalLights->GetNumberOfItems() << " lights." << std::endl; // renderer->AddLight(light); // can't do this here - must do this after the renderWindow->Render() below // Display where the light is vtkSmartPointer<vtkLightActor> lightActor = vtkSmartPointer<vtkLightActor>::New(); lightActor->SetLight(light); renderer->AddViewProp(lightActor); // Display where the light is focused vtkSmartPointer<vtkSphereSource> lightFocalPointSphere = vtkSmartPointer<vtkSphereSource>::New(); lightFocalPointSphere->SetCenter(lightFocalPoint); lightFocalPointSphere->SetRadius(.1); lightFocalPointSphere->Update(); vtkSmartPointer<vtkPolyDataMapper> lightFocalPointMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); lightFocalPointMapper->SetInputConnection(lightFocalPointSphere->GetOutputPort()); vtkSmartPointer<vtkActor> lightFocalPointActor = vtkSmartPointer<vtkActor>::New(); lightFocalPointActor->SetMapper(lightFocalPointMapper); lightFocalPointActor->GetProperty()->SetColor(1.0, 1.0, 0.0); //(R,G,B) renderer->AddViewProp(lightFocalPointActor); // Create a plane for the light to shine on vtkSmartPointer<vtkPlaneSource> planeSource = vtkSmartPointer<vtkPlaneSource>::New(); planeSource->SetResolution(100, 100); planeSource->Update(); vtkSmartPointer<vtkPolyDataMapper> planeMapper = vtkSmartPointer<vtkPolyDataMapper>::New(); #if VTK_MAJOR_VERSION <= 5 planeMapper->SetInput(planeSource->GetOutput()); #else planeMapper->SetInputData(planeSource->GetOutput()); #endif vtkSmartPointer<vtkActor> planeActor = vtkSmartPointer<vtkActor>::New(); planeActor->SetMapper(planeMapper); renderer->AddActor(planeActor); vtkSmartPointer<vtkRenderWindow> renderWindow = vtkSmartPointer<vtkRenderWindow>::New(); renderWindow->AddRenderer(renderer); vtkSmartPointer<vtkRenderWindowInteractor> renderWindowInteractor = vtkSmartPointer<vtkRenderWindowInteractor>::New(); renderWindowInteractor->SetRenderWindow(renderWindow); renderWindow->Render(); std::cout << "Now there are " << originalLights->GetNumberOfItems() << " lights." << std::endl; renderer->AddLight(light); // must do this after renderWindow->Render(); std::cout << "Now there are " << originalLights->GetNumberOfItems() << " lights." << std::endl; renderWindowInteractor->Start(); return EXIT_SUCCESS; }
CMakeLists.txt¶
cmake_minimum_required(VERSION 2.8) PROJECT(Light) find_package(VTK REQUIRED) include(${VTK_USE_FILE}) add_executable(Light MACOSX_BUNDLE Light.cxx) target_link_libraries(Light ${VTK_LIBRARIES})
Download and Build Light¶
Danger
The generation of tar files has not been ported to the new VTKExamples. Some tarballs may be missing or out-of-date.
Click here to download Light and its CMakeLists.txt file. Once the tarball Light.tar has been downloaded and extracted,
cd Light/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:
./Light
WINDOWS USERS PLEASE NOTE: Be sure to add the VTK bin directory to your path. This will resolve the VTK dll's at run time.