# PerlinNoise

VTKExamples/Java/Filtering/PerlinNoise

### Description

vtkPerlinNoise object computes a Perlin noise field as an implicit function.

Perlin noise, originally described by Ken Perlin, is a non-periodic and continuous noise function useful for modeling real-world objects.

Other Languages

See (Cxx), (Python)

### Code

PerlinNoise.java

    import vtk.vtkRenderWindow;
    import vtk.vtkActor;
    import vtk.vtkNativeLibrary;
    import vtk.vtkPolyDataMapper;
    import vtk.vtkNamedColors;
    import vtk.vtkRenderer;
    import vtk.vtkRenderWindowInteractor;
    import vtk.vtkPerlinNoise;
    import vtk.vtkSampleFunction;
    import vtk.vtkContourFilter;

    public class PerlinNoise
    {
      //-----------------------------------------------------------------
      // 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("Chartreuse", actorColor);
        colors.GetColor("DarkSalmon", Bgcolor);

        vtkPerlinNoise perlinNoise = new vtkPerlinNoise();
        perlinNoise.SetFrequency(2, 1.25,1.5);
        perlinNoise.SetPhase(0, 0, 0);

        vtkSampleFunction Sample = new vtkSampleFunction();
        Sample.SetImplicitFunction(perlinNoise);
        Sample.SetSampleDimensions(65, 65, 20);
        Sample.ComputeNormalsOff();

        vtkContourFilter Surface = new vtkContourFilter();
        Surface.SetInputConnection(Sample.GetOutputPort());
        Surface.SetValue(0, 0);

        vtkPolyDataMapper mapper = new vtkPolyDataMapper();
        mapper.SetInputConnection(Surface.GetOutputPort());
        mapper.ScalarVisibilityOff();

        vtkActor actor = new vtkActor();
        actor.SetMapper(mapper);
        actor.GetProperty().SetColor(actorColor);

        //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();

      }

    }