# BackfaceCulling

VTKExamples/Java/Visualization/BackfaceCulling

### Description

This example renders a sphere with backface culling enabled.

If backface culling is on, polygons facing away from camera are not drawn.

Other Languages

See (Cxx)

### Code

BackfaceCulling.java

    import vtk.vtkActor;
    import vtk.vtkSphereSource;
    import vtk.vtkNativeLibrary;
    import vtk.vtkPolyDataMapper;

    import vtk.vtkRenderWindow;
    import vtk.vtkNamedColors;
    import vtk.vtkRenderer;
    import vtk.vtkRenderWindowInteractor;

    public class BackfaceCulling
    {
      // -----------------------------------------------------------------
      // Load VTK library and print which library was not properly loaded
      static
      {
        if (!vtkNativeLibrary.LoadAllNativeLibraries())
        {
          for (vtkNativeLibrary lib : vtkNativeLibrary.values())
          {
            if (!lib.IsLoaded())
            {
              System.out.println(lib.GetLibraryName() + " not loaded");
            }
          }
        }
        vtkNativeLibrary.DisableOutputWindow(null);
      }
      // -----------------------------------------------------------------

      public static void main(String args[])
      {

        vtkNamedColors colors = new vtkNamedColors();

        //For Actor Color
        double actorColor[] = new double[4];
        //Renderer Background Color
        double Bgcolor[] = new double[4];

        colors.GetColor("Tan", actorColor);
        colors.GetColor("Aquamarine", Bgcolor);

        //Create a Sphere
        vtkSphereSource Sphere = new vtkSphereSource();
        Sphere.Update();

        //Create a Mapper and Actor
        vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
        Mapper.SetInputConnection(Sphere.GetOutputPort());

        vtkActor Actor = new vtkActor();
        Actor.SetMapper(Mapper);
        Actor.GetProperty().SetColor(actorColor);

        //Enable BackFaceCulling
        Actor.GetProperty().BackfaceCullingOn();

        // Create the renderer, render window and interactor.
        vtkRenderer ren = new vtkRenderer();
        vtkRenderWindow renWin = new vtkRenderWindow();
        renWin.AddRenderer(ren);
        vtkRenderWindowInteractor iren = new vtkRenderWindowInteractor();
        iren.SetRenderWindow(renWin);

        // Visualize the actor
        ren.AddActor(Actor);
        ren.SetBackground(Bgcolor);

        renWin.SetSize(300, 300);
        renWin.Render();

        iren.Initialize();
        iren.Start();
      }
    }