Generating 4 channels on one iR at 60 Hz?!?

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Bernard Leclerc (bleclerc++at++cae.ca)
Tue, 19 Nov 1996 15:16:57 -0500

Two weeks ago, I posted a message asking if it's feasible to generate 4
channels (800x600) at 60 Hz from a single InfiniteReality.

I didn't received any response!

Is it simply because my question was foolish? Come on, there must be at
least one person able to answer the question at SGI. Attached is a copy of
the message I sent previously. If more info is needed, please ask me.

--
Bernard Leclerc			CAE Electronics Ltd., 8585 Cote De Liesse
Technical Leader		Saint-Laurent, Quebec, Canada, H4L-4X4
3-D Graphics Applications	tel: +1 514 341 2000 extension 2275
bleclerc++at++cae.ca			fax: +1 514 340 5496





attached mail follows:
From: "Bernard Leclerc" 


Date: Thu, 7 Nov 1996 11:02:29 -0500


To: Performer Mailing List 


Subject: 1 iR, 4 channels, 60 Hz


Do you believe it's possible to generate 4 medium resolution (800x600)
channels at 60 Hz on a Onyx2 InfiniteReality Deskside with 1 pipe, 2 RMs,
DG5-8 option and 4 CPUs?


According to the specs and using a depth complexity of 2 for low level
flight, the fill rate would be sufficient (230/388 Mpixels/sec) and the
polygon capacity would be large enough (11M/4/60 = 45800 polygons per
frame per channel -- 10000 would be more than enough). However, I'm a bit
uncomfortable with the idea of having only 4 msec to draw one channel
knowing the field of view would be 60 by 45 degrees.


I'd like to receive comments from system integrators as well as from SGI
programmers.


Thanks a lot.



--
Bernard Leclerc			CAE Electronics Ltd., 8585 Cote De Liesse
Technical Leader		Saint-Laurent, Quebec, Canada, H4L-4X4
3-D Graphics Applications	tel: +1 514 341 2000 extension 2275
bleclerc++at++cae.ca			fax: +1 514 340 5496







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