title: How to add a "pointer" annotation to a 3-D plot in MATLAB?
body: <p>I want to add a "Pointer" to a 3-D plot.<br>
  I want this "pointer" to point at a certain spot on a sphere that I have drawn.<br>
  This pointer does not have to have an arrowhead but would be nice if it did. </p>
  
  <p>Thanks for any help!</p>