CSharp Find3DDist
From scripting
static double Find3DDist(double[] a, double[] b) { double ss = Math.Sqrt(Math.Pow((b[0]-a[0]),2) + Math.Pow((b[1]-a[1]),2) + Math.Pow((b[2]-a[2]),2)); return ss; }
Unrelated MEL scripting help located here: YSYT.