From: Joaquín Casillas (jcasilla++at++isoco.com)
Date: 02/28/2003 07:07:33
Dan Johnston wrote:
>"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?
>
>Dan.Johnston++at++nrc.gc.ca
>
>
>
Hi Dan,
I think we are also discussing a way of doing active stereo (or
pseudo-active, or whatever you call it) by using some trick with virtual
linux desktops, softgenlock and real time linux (see Sébastien
previously posted mail). This would work, for instance, on a GeForce4 Ti
card, that hasn't got quad-buffer stereo capabilities. It's not the
'normal' active stereo stuff, it's just a way of getting simililar results.
Regards,
-- ------------------------------------------------------------------------- Joaquín Casillas Meléndez(Quino), R+D Engineer at iSOCO Intelligent Software Components, S.A. http://www.isoco.com Addr. iSOCOVal: Profesor Beltrán Báguena, 4, oficina 305, 46009 Valencia Voice: +34 96 346 71 43 Fax: +34 96 346 71 42
This archive was generated by hypermail 2b29 : Fri Feb 28 2003 - 07:08:54 PST