# VTK/Examples/CSharp/SimpleOperations/DistanceBetweenPoints

From KitwarePublic

This example finds the squared distance and the Euclidean distance between two 3D points.

## DistanceBetweenPoints.cs

using System; using System.Runtime.InteropServices; using System.Diagnostics; using Kitware.VTK; void DistanceBetweenPoints() { // Create two points. double[] p0 = new double[] { 0.0, 0.0, 0.0 }; double[] p1 = new double[] { 1.0, 1.0, 1.0 }; IntPtr pP0 = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(double)) * 3); IntPtr pP1 = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(double)) * 3); Marshal.Copy(p0, 0, pP0, 3); Marshal.Copy(p1, 0, pP1, 3); // Find the squared distance between the points. double squaredDistance = vtkMath.Distance2BetweenPoints(pP0, pP1); // Take the square root to get the Euclidean distance between the points. double distance = Math.Sqrt(squaredDistance); // Output the results. Console.WriteLine("SquaredDistance = " + squaredDistance); Console.WriteLine("Distance = " + distance); Marshal.FreeHGlobal(pP0); Marshal.FreeHGlobal(pP1); }