using System.Windows.Media.Media3D; Point3D point = new Point3D(1, 2, 3);
using System.Windows.Media.Media3D; Point3D point1 = new Point3D(1, 2, 3); Point3D point2 = new Point3D(4, 5, 6); double distance = Point3D.Distance(point1, point2);The Server Point3D class is part of the System.Windows.Media.Media3D package, which is included in the .NET Framework.