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From: karron@KARRON.MED.NYU.EDU
Newsgroups: comp.sys.sgi
Subject: Re:  Resetting lighting and retaining viewpoint
Message-ID: <9011101653.AA04864@karron.med.nyu.edu>
Date: 10 Nov 90 16:53:25 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Reply-To: karron%CMCL2.NYU.EDU@cunyvm.cuny.edu
Organization: The Internet
Lines: 28

The ortho call does a hidden translation of the eye position. I
was thinking of this problem, and the solution to my mind is to
make a wrapper for the ortho call to eliminate the translation effect.

This would be by instead of defining a viewing RECTANGLE, force it to be a
viewing CUBE, and specify a height and width, not a left and right clipper,
etc.

I don't know how you would correct for a non square window. I would have to
think about that for a few more seconds before I made a better suggestion.

Please post your solution, as I do want to be able to switch transforms
for these reasons: While a perspective transform looks better, an ortho
is much better for sighting things along lines and taking measurements.

I also have a better winopen() call idea, and when I get all of this working
nicely, I will post it.

dan.
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