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From: hafner@ifi.unizh.ch (Michel Hafner)
Newsgroups: comp.sys.sgi
Subject: Hi-Res-Images from Graphics-HW
Message-ID: <1991Jun17.133844.4755@ifi.unizh.ch>
Date: 17 Jun 91 13:38:44 GMT
Sender: hafner@ifi.unizh.ch (Michel Hafner)
Organization: University of Zurich, Department of Computer Science
Lines: 13

I have been experimenting with high resolution pictures rendered by the gra-
phics hardware of a GL4DVGX-3.3. Based on the original values for the window-
command I changed left, right, top and bottom accordingly to get the subframes.
This didn't quite work as intended. The subimages often didn't fit perfectly
and there were visible seams. I could get rid of these seams by correcting
left and/or right and/or top and/or bottom by a 0.5 pixels. But I could never
figure out in advance where corrections were ( not ) necessary.
Is there a way to get rid of these seams without correcting left,right,top,
bottom or to find out what to correct without lengthy experiments? 
I used subpixel ( TRUE ), glcompat ( GLC_OLDPOLYGON, 0 )  and antialiasing 
with the accumulation-buffer.
Thanks in advance!
								M.H.