Re: Going big and stereo
Angus Dorbie (dorbie++at++sgi.com)
Thu, 21 May 1998 12:40:33 -0700
Angus Dorbie wrote:
>
> 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.
You could use DVR but only along one axis at anything over 1280x1024.
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