title: How to generate a unit vector pointing in a random direction with isotropic distribution of direction?
body: <p>I need to create a method to generate a unit vector in three dimensions that points in a random direction using a random number generator. The distribution of direction MUST be isotropic.<br>
  Here is how I am trying to generate a random unit vector:<br>
      <code>v = randn(1,3);<br>
      v = v./sqrt(v*v');</code><br>
  But I don't know how to complete the isotropic part. Any ideas?</p>