Re: [info-performer] Stereo using Performer - some basics

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From: Dan Johnston (dan.johnston++at++nrc.ca)
Date: 02/27/2003 09:46:31

-------- Original Message --------
Subject: Re: [info-performer] Stereo using Performer - some basics
Date: Thu, 27 Feb 2003 12:43:39 -0500
From: Dan Johnston <dan.johnston++at++nrc.ca>
Organization: National Research Council of Canada
To: Joaquín Casillas Meléndez <jcasilla++at++isoco.com>
CC: info-performer.sgi.com++at++nrc.ca
References: <3E5E4505.4000605++at++isoco.com>

Joaquín Casillas Meléndez wrote:

> Hi Dan,
>
> As you seem to know a lot about stereoscopic projection, I thought
> perhaps you would have tried with a linux box. Is it possible to do
> active stereo with Performer in a Linux system? I have a GeForce4Ti 4600
> card, the one that Asus sold with low-cost glasses conected to the card
> through a wire. I know someone has done some stuff by playing with linux
> virtual desktops, having each eye rendering in differente desktops and
> overlapping them. I'm searching the net for information about that, but
> with no result. Do you know something about this?

The problem on Linux is the driver software supplied by the vendor
(Nvidia
in your case). If the graphics card driver does not support active
stereo,
and
Nvida does NOT yet support stereo on all their cards, only the Quadro
series. If the driver does not provide a stereo 'visual', then you
cannot
use quad buffered stereo.

If you have a driver and a card which support quad buffered mode, then
active stereo should be no different than on IRIX. Note: watch your
values for depth (no. of bits) for each of the color buffers. On my ONYX
I use values like 32 on the 5 pipe machine, 15 or 16 on the deskside.
On Octane and PC hardware I often use 8.

Under MS-Windows SGI provided a utility program to list all the
available visuals. Your hardware would probably work there, because
the MS driver for your card does support quad buffered stereo.

Good luck! 

--
      ___|__    |
      /  |  \   ||\      Daniel (Dan) Johnston
     /___|___\  || \     Dan.Johnston++at++nrc.ca
    _____|____  ||  \    National Research Council of Canada, London, ON
    |    |    | ||   \   Integrated Manufacturing Technologies Institute
\___|    |    | ||____\  Tel: (519) 430-7081   Fax: (519) 430-7090
 \_o_\___|____|_|______\_    Inst: http://www.nrc.ca/imti
  \                o /    These opinions are my own! Not those of NRC.
   \________________/    Virtual Reality:
                        http://www.nrc.ca/imti/vetc/home.html
 More Tall Ships - Fewer Computers!

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