# SampleFunction

VTKExamples/CSharp/ImplicitFunctions/SampleFunction

### 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
Note: As long as ActiViz.NET is not build with VTK version 6.0 or higher you must define the preprocessor directive VTK_MAJOR_VERSION_5.

### Code

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

          private void SampleFunction() {
             vtkSphere sphere = vtkSphere.New();

             // Sample the function
             vtkSampleFunction sample = vtkSampleFunction.New();
             sample.SetSampleDimensions(50, 50, 50);
             sample.SetImplicitFunction(sphere);
             double value = 2.0;
             double xmin = -value, xmax = value, ymin = -value, ymax = value, zmin = -value, zmax = value;
             sample.SetModelBounds(xmin, xmax, ymin, ymax, zmin, zmax);

             // Create the 0 isosurface
             vtkContourFilter contours = vtkContourFilter.New();
    #if VTK_MAJOR_VERSION_5
             contours.SetInputConnection(sample.GetOutputPort());
    #else
             contours.SetInputData(sample);
    #endif
             contours.GenerateValues(1, 1, 1);

             // Map the contours to graphical primitives
             vtkPolyDataMapper contourMapper = vtkPolyDataMapper.New();
    #if VTK_MAJOR_VERSION_5
             contourMapper.SetInputConnection(contours.GetOutputPort());
    #else
             contourMapper.SetInputData(contours);
    #endif
             contourMapper.SetScalarRange(0.0, 1.2);

             // Create an actor for the contours
             vtkActor contourActor = vtkActor.New();
             contourActor.SetMapper(contourMapper);

             // -- create a box around the function to indicate the sampling volume --

             // Create outline
             vtkOutlineFilter outline = vtkOutlineFilter.New();
    #if VTK_MAJOR_VERSION_5
             outline.SetInputConnection(sample.GetOutputPort());
    #else
             outline.SetInputData(sample);
    #endif

             // Map it to graphics primitives
             vtkPolyDataMapper outlineMapper = vtkPolyDataMapper.New();
    #if VTK_MAJOR_VERSION_5
             outlineMapper.SetInputConnection(outline.GetOutputPort());
    #else
             outlineMapper.SetInputData(outline);
    #endif

             // Create an actor for it
             vtkActor outlineActor = vtkActor.New();

             outlineActor.SetMapper(outlineMapper);
             outlineActor.GetProperty().SetColor(0, 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(1.0, 1.0, 1.0);
             // add our actor to the renderer
             renderer.AddActor(contourActor);
             renderer.AddActor(outlineActor);
          }
       }
    }