title: How can I check if one game object can see another?
body: <p>I have an object, that is facing a particular direction with (for instance) a 45 degree field of view, and a limit view range. I have done all the initial checks (Quadtree node, and distance), but now I need to check if a particular object is within that view cone, (In this case to decide only to follow that object if we can see it). </p>
  
  <p>Apart from casting a ray for each degree from <code>Direction - (FieldOfView / 2)</code> to <code>Direction + (FieldOfView / 2)</code> (I am doing that at the moment and it is horrible), what is the best way to do this visibility check?</p>