This examples reads either a vtu (unstructured grid) or vtp (polydata) file and displays it to the screen.
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

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

using Kitware.VTK;

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

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

      private void ReadUnknownTypeXMLFile() {
         // Path to vtk data must be set as an environment variable
         // VTK_DATA_ROOT = "C:\VTK\vtkdata-5.8.0"
         vtkTesting test = vtkTesting.New();
         string root = test.GetDataRoot();
         string filePath = System.IO.Path.Combine(root, @"Data\quadraticTetra01.vtu");
         //string filePath = System.IO.Path.Combine(root, @"Data\SyntheticPolyline.vtp");

         // reader
         // Read all the data from the file
         vtkXMLGenericDataObjectReader reader = vtkXMLGenericDataObjectReader.New();
         // caution: you cannot use CanReadFile with the generic reader
         //if(reader.CanReadFile(filePath) == 0) {
         //   MessageBox.Show("Cannot read file \"" + filePath + "\"", "Error", MessageBoxButtons.OK);
         //   return;
         reader.Update(); // here we read the file actually

         // All of the standard data types can be checked and obtained like this:
         if(vtkPolyData.SafeDownCast(reader.GetOutput()) != null) {
            Debug.WriteLine("File is a polydata");
         else if(vtkUnstructuredGrid.SafeDownCast(reader.GetOutput()) != null) {
            Debug.WriteLine("File is an unstructured grid");

         // mapper
         vtkDataSetMapper mapper = vtkDataSetMapper.New();

         // actor
         vtkActor actor = vtkActor.New();

         // get a reference to the renderwindow of our renderWindowControl1
         vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
         vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
         // set background color
         renderer.SetBackground(0.2, 0.3, 0.4);
         // add our actor to the renderer