# GreedyTerrainDecimation

VTKExamples/CSharp/PolyData/GreedyTerrainDecimation

### 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

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

          private void GreedyTerrainDecimation() {
             // Create an image
             vtkImageData image = vtkImageData.New();
             image.SetDimensions(3, 3, 1);
             image.SetNumberOfScalarComponents(1);
             image.SetScalarTypeToUnsignedChar();
             int[] dims = image.GetDimensions();
             unsafe {
                for(int i = 0; i < dims[0]; i++) {
                   for(int j = 0; j < dims[1]; j++) {
                      byte* ptr = (byte*)image.GetScalarPointer(i, j, 0);
                      *ptr = (byte)vtkMath.Round(vtkMath.Random(0, 1));
                   }
                }
             }
             vtkGreedyTerrainDecimation decimation = vtkGreedyTerrainDecimation.New();
             decimation.SetInputConnection(image.GetProducerPort());
             decimation.Update();
             vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
             mapper.SetInputConnection(decimation.GetOutputPort());
             // actor
             vtkActor actor = vtkActor.New();
             actor.SetMapper(mapper);
             actor.GetProperty().SetInterpolationToFlat();
             actor.GetProperty().EdgeVisibilityOn();
             actor.GetProperty().SetEdgeColor(1, 0, 0);

             // 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(actor);
          }
       }
    }