# [vtkusers] Distance between points

csumushu csumushu at 126.com
Wed Nov 8 19:42:52 EST 2017

```Have you solved it now? I have the same problem,for data of type double, it
does not work.The following code is from
https://lorensen.github.io/VTKExamples/site/CSharp/SimpleOperations/DistanceBetweenPoints/

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);
}

--
Sent from: http://vtk.1045678.n5.nabble.com/VTK-Users-f1224199.html
```