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# Curvature

VTKEx/CSharp/PolyData/Curvature

### 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

Question

If you have a simple question about this example contact us at VTKExProject If your question is more complex and may require extended discussion, please use the VTK Discourse Forum

### Code

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

          private void Curvature() {
             // Path to vtk data must be set as an environment variable
             // VTK_DATA_ROOT = "C:\VTK\vtkdata-5.8.0"
             vtkTesting test = vtkTesting.New();
             string root = test.GetDataRoot();
             // note: one should use a coarse surface mesh to achieve a good visual effect
             string filePath = System.IO.Path.Combine(root, @"Data\bunny.vtp");
             // Create a polydata
             vtkXMLPolyDataReader reader = vtkXMLPolyDataReader.New();
             reader.SetFileName(filePath);

             vtkCurvatures curvaturesFilter = vtkCurvatures.New();
             curvaturesFilter.SetInputConnection(reader.GetOutputPort());
             //curvaturesFilter.SetCurvatureTypeToGaussian();
             //curvaturesFilter.SetCurvatureTypeToMean();
             //curvaturesFilter.SetCurvatureTypeToMaximum();
             curvaturesFilter.SetCurvatureTypeToMinimum();

             // To inspect more closely, if required
             vtkXMLPolyDataWriter writer = vtkXMLPolyDataWriter.New();
             writer.SetInputConnection(curvaturesFilter.GetOutputPort());
             writer.SetFileName(System.IO.Path.Combine(root, @"Data\gauss.vtp"));
             writer.Write();

             // Create a mapper and actor
             vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
             mapper.SetInputConnection(curvaturesFilter.GetOutputPort());
             double[] range = curvaturesFilter.GetOutput().GetScalarRange();
             mapper.SetScalarRange(range[0], range[1]);
             vtkActor actor = vtkActor.New();
             actor.SetMapper(mapper);
             // get a reference to the renderwindow of our renderWindowControl1
             vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
             // renderer
             vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
             // set background color
             renderer.SetBackground(0.0, 0.0, 0.0);
             // add our actor to the renderer
             renderer.AddActor(actor);
          }
       }
    }