# FillHoles

VTKExamples/CSharp/Meshes/FillHoles

### Description

This filter finds holes in a mesh and closes them.

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
Note: As long as ActiViz.NET is not build with VTK version 6.0 or higher you must define the preprocessor directive VTK_MAJOR_VERSION_5.

### Code

FillHoles.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 {
                FillHoles(null);
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }

          private void FillHoles(string filePath) {
             vtkPolyData input = vtkPolyData.New();
             if(filePath == null) {
                GenerateData(ref input);
             }
             else {
             vtkXMLPolyDataReader reader = vtkXMLPolyDataReader.New();
             reader.SetFileName(filePath);
             reader.Update();

             input.ShallowCopy(reader.GetOutput());
             }

             vtkFillHolesFilter fillHolesFilter = vtkFillHolesFilter.New();
    #if VTK_MAJOR_VERSION_5
             fillHolesFilter.SetInputConnection(input.GetProducerPort());
    #else
             fillHolesFilter.SetInputData(input);
    #endif

             fillHolesFilter.Update();

             // Create a mapper and actor
             vtkPolyDataMapper originalMapper = vtkPolyDataMapper.New();
    #if VTK_MAJOR_VERSION_5
             originalMapper.SetInputConnection(input.GetProducerPort());
    #else
             originalMapper.SetInputData(input);
    #endif

             vtkActor originalActor = vtkActor.New();
             originalActor.SetMapper(originalMapper);

             vtkPolyDataMapper filledMapper = vtkPolyDataMapper.New();
             filledMapper.SetInputConnection(fillHolesFilter.GetOutputPort());

             vtkActor filledActor = vtkActor.New();
             filledActor.SetMapper(filledMapper);

             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             this.Size = new System.Drawing.Size(612, 352);

             // Define viewport ranges
             // (xmin, ymin, xmax, ymax)
             double[] leftViewport = new double[] { 0.0, 0.0, 0.5, 1.0 };
             double[] rightViewport = new double[] { 0.5, 0.0, 1.0, 1.0 };

             // Setup both renderers
             vtkRenderer leftRenderer = vtkRenderer.New();
             renderWindow.AddRenderer(leftRenderer);
             leftRenderer.SetViewport(leftViewport[0], leftViewport[1], leftViewport[2], leftViewport[3]);
             leftRenderer.SetBackground(.6, .5, .4);

             vtkRenderer rightRenderer = vtkRenderer.New();
             renderWindow.AddRenderer(rightRenderer);
             rightRenderer.SetViewport(rightViewport[0], rightViewport[1], rightViewport[2], rightViewport[3]);
             rightRenderer.SetBackground(.4, .5, .6);

             // Add the sphere to the left and the cube to the right
             leftRenderer.AddActor(originalActor);
             rightRenderer.AddActor(filledActor);
             leftRenderer.ResetCamera();
             rightRenderer.ResetCamera();
             renderWindow.Render();
          }

          void GenerateData(ref vtkPolyData input)
          {
            // Create a sphere
            vtkSphereSource sphereSource = vtkSphereSource.New();
            sphereSource.Update();

            // Remove some cells
            vtkIdTypeArray ids = vtkIdTypeArray.New();
            ids.SetNumberOfComponents(1);

            // Set values
            ids.InsertNextValue(2);
            ids.InsertNextValue(10);

            vtkSelectionNode selectionNode = vtkSelectionNode.New();

            selectionNode.SetFieldType((int)vtkSelectionNode.SelectionField.CELL);
            selectionNode.SetContentType((int)vtkSelectionNode.SelectionContent.INDICES);
            selectionNode.SetSelectionList(ids);
            selectionNode.GetProperties().Set(vtkSelectionNode.INVERSE(), 1); //invert the selection

            vtkSelection selection = vtkSelection.New();
            selection.AddNode(selectionNode);

            vtkExtractSelection extractSelection = vtkExtractSelection.New();
            extractSelection.SetInputConnection(0, sphereSource.GetOutputPort());
    #if VTK_MAJOR_VERSION_5
            extractSelection.SetInput(1, selection);
    #else
            extractSelection.SetInputData(1, selection);
    #endif
            extractSelection.Update();

            // In selection
            vtkDataSetSurfaceFilter surfaceFilter = vtkDataSetSurfaceFilter.New();
            surfaceFilter.SetInputConnection(extractSelection.GetOutputPort());
            surfaceFilter.Update();

            input.ShallowCopy(surfaceFilter.GetOutput());
          }
       }
    }