Path: utzoo!attcan!uunet!cs.utexas.edu!asuvax!ncar!boulder!jdm
From: jdm@boulder.Colorado.EDU (James D. Meiss)
Newsgroups: comp.sys.sgi
Subject: Screen to World coordinate mapping
Summary: How do you read the mouse position?
Keywords: GetValuator, MOUSEX, map2w
Message-ID: <18930@boulder.Colorado.EDU>
Date: 28 Mar 90 16:23:18 GMT
Sender: news@boulder.Colorado.EDU
Reply-To: jdm@boulder.Colorado.EDU (James D. Meiss)
Organization: University of Colorado, Boulder
Lines: 14


	I am just learning how to program using gl on our new
personal Iris, and enjoying it for the most part!
	I am trying to read the position of the mouse to use
as input to my program. The problem is that GetValuator(MOUSEX)
returns the position in screen coordinates. How do I convert
this position to World coordinates?
	map2w seems to do this but only if I create an object.
It seems like there should be some simpler way. I use
ortho2(-1.,1.,-1.,1.) to set up my world coordinates.

	Thanks
	Jim Meiss
	jdm@boulder.colorado.edu