# Tetrahedron

VTKExamples/CSharp/GeometricObjects/Tetrahedron

### 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

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

          private void Tetrahedron() {
             vtkPoints points = vtkPoints.New();
             points.InsertNextPoint(0, 0, 0);
             points.InsertNextPoint(1, 0, 0);
             points.InsertNextPoint(1, 1, 0);
             points.InsertNextPoint(0, 1, 1);
             points.InsertNextPoint(5, 5, 5);
             points.InsertNextPoint(6, 5, 5);
             points.InsertNextPoint(6, 6, 5);
             points.InsertNextPoint(5, 6, 6);

             // Method 1
             vtkUnstructuredGrid unstructuredGrid1 = vtkUnstructuredGrid.New();
             unstructuredGrid1.SetPoints(points);

             int[] ptIds = new int[] { 0, 1, 2, 3 };
             IntPtr ptIdsPointer = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(int)) * 4);
             Marshal.Copy(ptIds, 0, ptIdsPointer, 4);
             unstructuredGrid1.InsertNextCell(10, 4, ptIdsPointer);
             Marshal.FreeHGlobal(ptIdsPointer);

             // Method 2
             vtkUnstructuredGrid unstructuredGrid2 = vtkUnstructuredGrid.New();
             unstructuredGrid2.SetPoints(points);

             vtkTetra tetra = vtkTetra.New();

             tetra.GetPointIds().SetId(0, 4);
             tetra.GetPointIds().SetId(1, 5);
             tetra.GetPointIds().SetId(2, 6);
             tetra.GetPointIds().SetId(3, 7);

             vtkCellArray cellArray = vtkCellArray.New();
             cellArray.InsertNextCell(tetra);
             unstructuredGrid2.SetCells(10, cellArray);

             // Create a mapper and actor
             vtkDataSetMapper mapper1 = vtkDataSetMapper.New();
             mapper1.SetInputConnection(unstructuredGrid1.GetProducerPort());

             vtkActor actor1 = vtkActor.New();
             actor1.SetMapper(mapper1);

             // Create a mapper and actor
             vtkDataSetMapper mapper2 = vtkDataSetMapper.New();
             mapper2.SetInputConnection(unstructuredGrid2.GetProducerPort());

             vtkActor actor2 = vtkActor.New();
             actor2.SetMapper(mapper2);

             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
             renderer.SetBackground(0.2, 0.3, 0.4);
             // Add the actor to the scene
             renderer.AddActor(actor1);
             renderer.AddActor(actor2);
             renderer.SetBackground(.3, .6, .3); // Background color green
          }
       }
    }