# QuadricLODActor

VTKExamples/Cxx/Visualization/QuadricLODActor

### Description

If you have a fast graphics card you may not see a difference with the sphere model.

### Code

QuadricLODActor.cxx

    #include <vtkPolyDataMapper.h>
    #include <vtkQuadricLODActor.h>
    #include <vtkRenderWindow.h>
    #include <vtkRenderer.h>
    #include <vtkRenderWindowInteractor.h>
    #include <vtkPolyData.h>
    #include <vtkProperty.h>
    #include <vtkSmartPointer.h>
    #include <vtkSphereSource.h>

    int main(int, char *[])
    {
      // High res sphere
      vtkSmartPointer<vtkSphereSource> highResSphereSource =
        vtkSmartPointer<vtkSphereSource>::New();
      highResSphereSource->SetThetaResolution(200);
      highResSphereSource->SetPhiResolution(200);
      highResSphereSource->Update();

      vtkSmartPointer<vtkPolyDataMapper> highResMapper =
        vtkSmartPointer<vtkPolyDataMapper>::New();
      highResMapper->SetInputConnection(highResSphereSource->GetOutputPort());

      vtkSmartPointer<vtkQuadricLODActor> actor =
        vtkSmartPointer<vtkQuadricLODActor>::New();
      actor->SetMapper(highResMapper);
      actor->GetProperty()->SetInterpolationToFlat();

      // 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);

      renderWindowInteractor->SetDesiredUpdateRate(1e20);

      renderer->AddActor(actor);
      renderWindow->Render();
      renderWindowInteractor->Start();

      return EXIT_SUCCESS;
    }

### CMakeLists.txt

    cmake_minimum_required(VERSION 2.8)

    PROJECT(QuadricLODActor)

    find_package(VTK REQUIRED)
    include(${VTK_USE_FILE})

    add_executable(QuadricLODActor MACOSX_BUNDLE QuadricLODActor.cxx)

    target_link_libraries(QuadricLODActor ${VTK_LIBRARIES})

### Download and Build QuadricLODActor

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 Some tarballs may be missing or out-of-date.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 QuadricLODActor and its CMakeLists.txt file. Once the tarball QuadricLODActor.tar has been downloaded and extracted,

    cd QuadricLODActor/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:

    ./QuadricLODActor

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.