[Chimera-users] DepthQ stereo projector

[Dougherty, Matthew T.]

I also took the theater emitter apart, looking for some kind of switch or jumper. 

I was surprised by the amount of electronics.
I expected the bank of power transistors to drive the ~30IR LED, the other stuff I did not expect.

I need to contact the manufacturer, stereographics, about possible modifications.

As for the frame delay sync problem between the projector and the CRT,
one solution would be a vga delay box, if it exists, where it inputs vga, buffers it and delays it by adjustment, and outputs vga.  I will contact the crt manufacturer to see if they have some ideas.

Right now we are experimenting with passive/polarized stereo, but that requires projectors.
So I am anticipating the continued need for active goggles for workstation situations.

Another variable on the correct approach is the direction the entertainment/gaming/film industries.



 
Matthew Dougherty
713-433-3849 
National Center for Macromolecular Imagingjavascript:EditRecip(1);
Baylor College of Medicine/Houston Texas USA
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-----Original Message-----
From: chimera-users-bounces at cgl.ucsf.edu on behalf of Tom Ferrin
Sent: Fri 8/15/2008 8:36 PM
To: Greg Couch
Cc: chimera-users at cgl.ucsf.edu
Subject: Re: [Chimera-users] DepthQ stereo projector
 
One could also build a very simple circuit that just inverts
the stereo sync signal before it goes to the emitter.  A single
transistor is all that's needed.  The sync signal level is 0v-5v.

--tom


> Just to follow up to the list.  This is a generic problem for all OpenGL 
> stereo applications due to the DepthQ projector delaying the images for a 
> full frame.  So what OpenGL thinks is the left eye comes out as the right 
> eye and vice-versa.
> 
> The simpliest solution that fixes all stereo applications is to use a 
> NuVision stereo emittor that lets you switch the left and right eyes.
> Otherwise, each stereo application needs an option to switch the eyes
> and currently, chimera lacks that option (to be fixed soon).  In the mean 
> time, only use the DepthQ projector with Microsoft Windows.
> 
>  	- Greg
> 
> On Thu, 14 Aug 2008, Greg Couch wrote:
> 
> > Chimera does not have an option to switch the eyes.  Since it is a device
> > specific problem, we have expected it to be fixed by the device driver and
> > on other platforms, the device driver does have that option.  Lightspeed,
> > who makes the DepthQ projector, is here at SIGGRAPH, so I'll stop by their
> > booth and learn more about the projector.
> >
> > 	- Greg
> >
> > On Thu, 14 Aug 2008, Matthew Dougherty wrote:
> >
> >> I have been using chimera/macAqua with sequential stereo with no
> >> problems on a CRT.
> >>
> >> I am running into problems using the depth-q stereo projector because
> >> of the way their frame buffer works.
> >> Their left and right is inverted relative to the CRT.
> >>
> >> On other packages I activate a left/right image swap to get around this.
> >>
> >> Is there something I can do to achieve this on Chimera?
> >>
> >> Matt
> >> National Center for Macromolecular Imaging
> >> _______________________________________________
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> >>
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