ColorDisconnectedRegions

import vtk.vtkActor;
import vtk.vtkSphereSource;
import vtk.vtkAppendPolyData;
import vtk.vtkPolyDataConnectivityFilter;
import vtk.vtkNativeLibrary;
import vtk.vtkPolyDataMapper;
import vtk.vtkRenderWindow;
import vtk.vtkRenderWindowInteractor;
import vtk.vtkRenderer;


public class ColorDisconnectedRegions 
{

  // -----------------------------------------------------------------
  // 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 s[]) 
  {
    // Create some spheres
    vtkSphereSource Sphere1 = new vtkSphereSource();
    Sphere1.Update();

    vtkSphereSource Sphere2 = new vtkSphereSource();
    Sphere2.SetCenter(5.0,0.0,0.0);
    Sphere2.Update();

    vtkSphereSource Sphere3 = new vtkSphereSource();
    Sphere3.SetCenter(10.0,0.0,0.0);
    Sphere3.Update();


    vtkAppendPolyData AppendFilter = new vtkAppendPolyData();
    AppendFilter.AddInputConnection(Sphere1.GetOutputPort());
    AppendFilter.AddInputConnection(Sphere2.GetOutputPort());
    AppendFilter.AddInputConnection(Sphere3.GetOutputPort());
    AppendFilter.Update();


    vtkPolyDataConnectivityFilter ConnectivityFilter = new vtkPolyDataConnectivityFilter();
    ConnectivityFilter.SetInputConnection(AppendFilter.GetOutputPort());
    ConnectivityFilter.SetExtractionModeToAllRegions();
    ConnectivityFilter.ColorRegionsOn();
    ConnectivityFilter.Update();


    //Create a Mapper and Actor
    vtkPolyDataMapper Mapper = new vtkPolyDataMapper();
    Mapper.SetInputConnection(ConnectivityFilter.GetOutputPort());
    Mapper.SetScalarRange(ConnectivityFilter.GetOutput().GetPointData().GetArray("RegionId").GetRange());
    Mapper.Update();

    vtkActor Actor = new vtkActor();
    Actor.SetMapper(Mapper);


    // 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);

    // Visualise the arrow
    ren.AddActor(Actor);
    ren.ResetCamera();

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

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

  }
}