# DistanceBetweenPoints

VTKExamples/CSharp/SimpleOperations/DistanceBetweenPoints

### Description

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

### Code

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);
    }