Re: Going big and stereo
Angus Dorbie (dorbie++at++sgi.com)
Thu, 21 May 1998 12:23:07 -0700
Chris Jackson wrote:
>
> On Mon, 18 May 1998, Angus Dorbie wrote:
>
> >
> > You are going to have to reduce resolution, which top_bottom (SRT_RECT)
> > does by definition in Y. The high field rate in stereo vofs require lots
> > of bandwidth. Also display devices don't support the kinds of line
> > rates you need for these vofs. So start with your display and work back
> > from there.
>
> >
> > It looks like you have a 1RM Reality (not Infinite Reality) so you don't
> > have a lot of framebuffer but you could config 2 * 1280x1024
> > framebuffer. You should explore getting 2 projectors and twinning them
> > feeding left and right eyes from different channels on the DG to the
> > projectors which will remove the per channel bandwidth limits and solve
> > any projector line rate problems.
> >
> > Even if you had more RMs and an Infinite REality you cannot do 1900x1200
> > 60Hz stereo, you don't have the RM->DG bandwidth or the DAC bandwidth on
> > any
> > channel. You couldn't even do 2*1900x1200 channels because of the DG->RM
> > bandwidth limit unless you squeezed video field rate to 50Hz.
> >
>
> The critical problem is that my diplay must be configured at 1900x1200.
> I can easily reduce resolution to 1280x1024 (or lower), but from what I
> understand, pixel depth will remain the same. Isn't it true that a
> medium pixel depth is required for doublebuffered stereo?
Configure your managed area download ot eeprom, restart graphics and use
findvis or glxinfo to list supported visuals.
>
> Is there any way to implement stereo (top/bottom or otherwise) with graphics
> initialized to 1900x1200?
If you can configure a managed area that size yes, but you would have to
compile
a video format and then all you've done is half the vertical resolution
in each
field so you've actually only got 1900x600 with old style stereo, (munus
any
blanking lines between fields)
>
> At this point, I'm willing to use any resolution and any video field
> rate...
But what about your display, you started by saying that your display
must
be configured to 1900x1200.
Cheers,Angus.
--
"Only the mediocre are always at their best." -- Jean Giraudoux
For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/
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on Mon Aug 10 1998 - 17:57:25 PDT