title: Ray-Sphere intersection
body: <p>Is there any Ray sphere interestion code in OpenGL. I really need to understand that program so I am looking for it but can't find it. This seems to be popular problem but I can only find the formula and basic principle not any example.
  <a href="http://wiki.cgsociety.org/index.php/Ray_Sphere_Intersection" rel="nofollow">http://wiki.cgsociety.org/index.php/Ray_Sphere_Intersection</a></p>
  
  <p>I have no idea how to go about it. This is what I got: <a href="http://www.sendspace.com/file/8gb6fj" rel="nofollow">http://www.sendspace.com/file/8gb6fj</a></p>
  
  <p>Has anyone of you done it or know for some source where I can get the program ?</p>