# ColorDisconnectedRegions

VTKExamples/CSharp/PolyData/ColorDisconnectedRegions

### Description

A tutorial on how to setup a Windows Forms Application utilizing ActiViz.NET can be found here: Setup a Windows Forms Application to use ActiViz.NET

### Code

ColorDisconnectedRegions.cs

    using System;
    using System.Collections.Generic;
    using System.ComponentModel;
    using System.Windows.Forms;
    using System.Diagnostics;

    using Kitware.VTK;

    namespace ActiViz.Examples {
       public partial class Form1 : Form {
          public Form1() {
             InitializeComponent();
          }

          private void renderWindowControl1_Load(object sender, EventArgs e) {
             try {
                ColorDisconnectedRegions();
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }

          private void ColorDisconnectedRegions() {
             // Create some spheres
             vtkSphereSource sphereSource1 = vtkSphereSource.New();
             sphereSource1.Update();

             vtkSphereSource sphereSource2 = vtkSphereSource.New();
             sphereSource2.SetCenter(5, 0, 0);
             sphereSource2.Update();

             vtkSphereSource sphereSource3 = vtkSphereSource.New();
             sphereSource3.SetCenter(10, 0, 0);
             sphereSource3.Update();

             vtkAppendPolyData appendFilter = vtkAppendPolyData.New();
             appendFilter.AddInputConnection(sphereSource1.GetOutputPort());
             appendFilter.AddInputConnection(sphereSource2.GetOutputPort());
             appendFilter.AddInputConnection(sphereSource3.GetOutputPort());

             vtkPolyDataConnectivityFilter connectivityFilter = vtkPolyDataConnectivityFilter.New();
             connectivityFilter.SetInputConnection(appendFilter.GetOutputPort());
             connectivityFilter.SetExtractionModeToAllRegions();
             connectivityFilter.ColorRegionsOn();
             connectivityFilter.Update();

             // Visualize
             vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
             mapper.SetInputConnection(connectivityFilter.GetOutputPort());
             double[] range = connectivityFilter.GetOutput().GetPointData().GetArray("RegionId").GetRange();
             mapper.SetScalarRange(range[0], range[1] );

             vtkActor actor = vtkActor.New();
             actor.SetMapper(mapper);
             // get a reference to the renderwindow of our renderWindowControl1
             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             // renderer
             vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
             // set background color
             renderer.SetBackground(0.0, 0.0, 0.0);
             // add our actor to the renderer
             renderer.AddActor(actor);
          }
       }
    }