Ahaaaa...

That make things a bit clearer :-)  We do have a geowall, but the Linux driver supplied by Nvidia directly supports sending the left and right images of the quad-buffered stereo to the two separate video heads on the card, which are then connected to the two projectors. This eliminates the need for the very expensive active-to-passive stereo converter. This do require a Quadro-card, though. It is not supported by the cheaper GeForce cards.

I think the Linux driver also support the type of stereo you mention here: Making a kind of side-by-side stereo, which is then converted to "real" stereo by doubling the desktop width, and splitting desktop between the two heads. I haven't tried, but I guess that is also supported by the GeForce cards. If it is not too difficult, I'll give it a try!

I would argue that even though you can save a few hundred bucks (difference between a Quadro and a GeForce card), the Quadro card solution is easier. A Quadro FX 1300 card is around for about $300-400, which is still small compared to the Geowall system. But for Mac (and maybe Windows?) users, this driver option may not be available.


Cheers

Esben


-----Original Message-----
From: Warren DeLano [mailto:warren@delsci.com]
Sent: Mon 2005-10-17 22:43
To: EPF (Esben Peter Friis)
Subject: RE: [PyMOL] Geowall Testing

Esben,

If that is the case, then you don't actually have a "Geowall" -- you
have a professional stereo device setup that converts the active-stereo
signal sent from the nVidia cards into a passive-stereo signal for the
two projectors.  That's equivalent to QBS stereo on a CRT with glasses,
but typically costs quite a bit more (as much as $50k USD)

Geowalls are a low-end alternative the geologists came up with a few
years back.  Instead of requiring a stereo-capable video card, they use
a normal (not necessarily stereo-capable) dual-headed video card to
drive two projecters straight from the PC.

That can bring the cost down to under $5k total, but it means that the
software needs to draw the complete image twice, including the GUI,
hence these changes.

Cheers,
Warren

--
Warren L. DeLano, Ph.D.                    
Principal Scientist

. DeLano Scientific LLC 
. 400 Oyster Point Blvd., Suite 213          
. South San Francisco, CA 94080 USA  
. Biz:(650)-872-0942  Tech:(650)-872-0834    
. Fax:(650)-872-0273  Cell:(650)-346-1154
. mailto:warren@delsci.com     


> -----Original Message-----
> From: pymol-users-admin@lists.sourceforge.net
> [mailto:pymol-users-admin@lists.sourceforge.net] On Behalf Of
> EPF (Esben Peter Friis)
> Sent: Monday, October 17, 2005 1:30 PM
> To: Warren DeLano
> Cc: pymol-users@lists.sourceforge.net
> Subject: RE: [PyMOL] Geowall Testing
>
>
> I'll try it when I get back to work tomorrow - but I'm a bit
> confused :-)  The features you mention, haven't they been
> part of PyMOL for some time already? We have active stereo
> glasses for our workstations, and use the same PyMOL version
> (0.99beta14) for those and the Geowall.
>
>
> Cheers,
>
> Esben
>
>
> -----Original Message-----
> From: Warren DeLano [mailto:warren@delsci.com]
> Sent: Mon 2005-10-17 22:06
> To: EPF (Esben Peter Friis)
> Subject: RE: [PyMOL] Geowall Testing
>
> Esben,
>
> Great!
>
> Added: support for the internal gui, pop-up menus, sequence
> viewer, and command line when using a passive stereo setup
> (versus active stereo setups that cost about 10X more).
>
> Can you try the build at http://delsci.com/beta?
>
> Cheers,
> Warren
>
>
>
> --
> Warren L. DeLano, Ph.D.                  
> Principal Scientist
>
> . DeLano Scientific LLC
> . 400 Oyster Point Blvd., Suite 213        
> . South San Francisco, CA 94080 USA
> . Biz:(650)-872-0942  Tech:(650)-872-0834  
> . Fax:(650)-872-0273  Cell:(650)-346-1154
> . mailto:warren@delsci.com   
>
>
>
>
>
> ________________________________
>
>         From: EPF (Esben Peter Friis) [mailto:EPF@novozymes.com]
>         Sent: Monday, October 17, 2005 12:58 PM
>         To: Warren DeLano
>         Subject: RE: [PyMOL] Geowall Testing
>       
>       
>
>
>         Yep - we have one, which we use mostly for PyMOL presentations
> :-)
>         Stereo already works great, so I'm curious what you
> have in mind. The computer connected to it is running Linux
> (Fedora Core 2) and uses an Nvidia Quadro 750GLX card.
>       
>       
>         Cheers,
>       
>         Esben
>       
>         -----Original Message-----
>         From: pymol-users-admin@lists.sourceforge.net on
> behalf of Warren DeLano
>         Sent: Mon 2005-10-17 16:27
>         To: pymol-users@lists.sourceforge.net
>         Subject: [PyMOL] Geowall Testing
>       
>         PyMOL Users:
>       
>         Regarding "geowalls" [also known as dual-projector
> passive stereo setups
>         that use polarized lenses & glasses to deliver
> low-cost stereo 3D to
>         large audiences]...
>       
>         Does anyone have one set up right now who might be
> able to test a new
>         PyMOL build with improved geowall stereo support?
>       
>         Cheers,
>         Warren
>       
>         --
>         Warren L. DeLano, Ph.D.                  
>         Principal Scientist
>       
>         . DeLano Scientific LLC
>         . 400 Oyster Point Blvd., Suite 213        
>         . South San Francisco, CA 94080 USA
>         . Biz:(650)-872-0942  Tech:(650)-872-0834  
>         . Fax:(650)-872-0273  Cell:(650)-346-1154
>         . mailto:warren@delsci.com   
>       
>       
>       
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