   Is an object in view
  Hi all I'm trying to work out a way if an object is on screen.  Basically I use gluLookAt for my position, if I know the position of a model (xyz) is their a routine to tell if it's on screen, or even what part of the screen it's on?Hope that makes sense. Thanks in  advance :)   
  This might help - http://www.gamedev.net/community/forums/topic.asp?topic_id=258586   