From: Dan Johnston (dan.johnston++at++nrc.ca)
Date: 02/28/2003 06:27:46
"jan p. springer" wrote:
> Dan Johnston wrote:
>
> >
> > Yes. you are right in that you should be able to create a passive stereo
> > output on any twin view compatible graphics card. You just create
> > a pfChannel to show to each view window. I had forgotten that option
> > in my discussion. I know it was done a few years ago using
> > the Matrox twin view board (which was very slow (then) in 3D).
> > It should work well for any dual output GForce3 or GForce4.
> >
>
> correction: not any geforce 4 is supported by this.
> the nvidia driver insists on enabling stereo (visuals) only on quadro 4
> boards.
> i've re-read the doc more carefully and it seems the driver is right:
> [from /usr/share/doc/NVIDIA_GLX-1.0/README installed by the 41.91 glx rpm]
> <quote>
>
> Stereo is only available on Quadro cards, and is not
> supported in TwinView (with the exception of TwinView
> clone mode stereo, option #4 above). Currently, stereo
> operation may be "quirky" on the original Quadro (NV10)
> chip and left-right flipping may be erratic. We are
> trying to resolve this issue for a future release.
> Default: Stereo is not enabled.
>
> </quote>
>
Wait a moment here! We were discussing the option of using any twinview
graphics card for PASSIVE stereo. The general idea is that you create a
virtual display (pfPipeWindow) which is big enough for both your eye
views (left and right pfChannels) side by side. Then left channel will
come out of one graphics card output, the right out the other. Use
HMD or passive projection to see the stereo result.
You do not need any quad-buffer option in the graphics card. You
do not need a special stereo visual. You do not need to use a
field sequencial video format.
What we are describing is all done in OpenGL Parformer software
by defining the eye offsets applied to the two pfChannels. The
hardware features of the graphics board (asuming it is fast enough)
do not matter much as long as you can create that big pfPipeWindow.
Perhaps I am missing something in your comments?
--
___|__ |
/ | \ ||\ Daniel (Dan) Johnston
/___|___\ || \ Dan.Johnston++at++nrc.gc.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
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