# Point

VTKExamples/CSharp/GeometricObjects/Point

### 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

Other Languages

See (Cxx), (Python)

Question

### Code¶

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

private void Point() {
// Create the geometry of the points (the coordinate)
vtkPoints points = vtkPoints.New();
double[,] p = new double[,] {
{1.0, 2.0, 3.0},
{3.0, 1.0, 2.0},
{2.0, 3.0, 1.0}
};

// Create topology of the points (a vertex per point)
vtkCellArray vertices = vtkCellArray.New();
int nPts = 3;

int[] ids = new int[nPts];
for(int i = 0; i < nPts; i++)
ids[i] = points.InsertNextPoint(p[i, 0], p[i, 1], p[i, 2]);

int size = Marshal.SizeOf(typeof(int)) * nPts;
IntPtr pIds = Marshal.AllocHGlobal(size);
Marshal.Copy(ids, 0, pIds, nPts);
vertices.InsertNextCell(nPts, pIds);
Marshal.FreeHGlobal(pIds);

// Create a polydata object
vtkPolyData pointPoly = vtkPolyData.New();

// Set the points and vertices we created as the geometry and topology of the polydata
pointPoly.SetPoints(points);
pointPoly.SetVerts(vertices);

// Visualize
vtkPolyDataMapper mapper = vtkPolyDataMapper.New();
mapper.SetInput(pointPoly);

vtkActor actor = vtkActor.New();
actor.SetMapper(mapper);
actor.GetProperty().SetPointSize(20);
vtkRenderWindow renderWindow = renderWindowControl1.RenderWindow;
vtkRenderer renderer = renderWindow.GetRenderers().GetFirstRenderer();
renderer.SetBackground(0.3, 0.2, 0.1);
}
}
}