# Hexahedron

VTKExamples/CSharp/GeometricObjects/Hexahedron

### Description

This example creates eight points and creates a hexahedron from the points.
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

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

          private void Hexahedron() {
             // Setup the coordinates of eight points
             // (faces must be in counter clockwise order as viewed from the outside)
             double[,] p = new double[,] {
                { 0.0, 0.0, 0.0 },
                { 1.0, 0.0, 0.0 },
                { 1.0, 1.0, 0.0 },
                { 0.0, 1.0, 0.0 },
                { 0.0, 0.0, 1.0 },
                { 1.0, 0.0, 1.0 },
                { 1.0, 1.0, 1.0 },
                { 0.0, 1.0, 1.0 }
             };

             // Create the points
             vtkPoints points = vtkPoints.New();
             for(int i = 0; i < 8; i++)
                points.InsertNextPoint(p[i, 0], p[i, 1], p[i, 2]);

             // Create a hexahedron from the points
             vtkHexahedron hex = vtkHexahedron.New();
             for(int i = 0; i < 8; i++)
                hex.GetPointIds().SetId(i, i);

             // Add the hexahedron to a cell array
             vtkCellArray hexs = vtkCellArray.New();
             hexs.InsertNextCell(hex);

             // Add the points and hexahedron to an unstructured grid
             vtkUnstructuredGrid uGrid = vtkUnstructuredGrid.New();
             uGrid.SetPoints(points);
             uGrid.InsertNextCell(hex.GetCellType(), hex.GetPointIds());

             // Visualize
             vtkDataSetMapper mapper = vtkDataSetMapper.New();
             mapper.SetInput(uGrid);
             vtkActor actor = vtkActor.New();
             actor.SetMapper(mapper);
             actor.GetProperty().SetLineWidth(4);
             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
             renderer.SetBackground(0.2, 0.3, 0.4);
             renderer.AddActor(actor);
             renderer.ResetCamera();
          }
       }
    }