# ReadUnstructuredGrid

VTKExamples/CSharp/IO/ReadUnstructuredGrid

### Description

This examples demonstrates how to read an unstructured grid (VTU) file.

An example data file (.vtu) for testing can be found in VTKData/Data/quadraticTetra01.vtu.

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

ReadUnstructuredGrid.cs

    using System;
    using System.ComponentModel;
    using System.Windows.Forms;

    using Kitware.VTK;

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

          private void renderWindowControl1_Load(object sender, EventArgs e) {
             try {
                string filePath = @"C:\VTK\vtkdata-5.8.0\Data\quadraticTetra01.vtu";

                // reader
                vtkXMLUnstructuredGridReader reader = vtkXMLUnstructuredGridReader.New();
                if(reader.CanReadFile(filePath) == 0) {
                   MessageBox.Show("Cannot read file \"" + filePath + "\"", "Error", MessageBoxButtons.OK);
                   return;
                }
                reader.SetFileName(filePath);
                reader.Update(); // here we read the file actually

                // mapper
                vtkDataSetMapper gridMapper = vtkDataSetMapper.New();
                gridMapper.SetInputConnection(reader.GetOutputPort());

                // actor
                vtkActor gridActor = vtkActor.New();
                gridActor.SetMapper(gridMapper);

                // get a reference to the renderwindow of our renderWindowControl1
                vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;

                // renderer
                vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
                // set background color
                renderer.SetBackground(0.2, 0.3, 0.4);

                // add our actor to the renderer
                renderer.AddActor(gridActor);

                // reposition the camera, so that actor can be fully seen
                renderer.ResetCamera();
             }
             catch(Exception ex) {
                MessageBox.Show(ex.Message, "Exception", MessageBoxButtons.OK);
             }
          }
       }
    }