Angus Dorbie (dorbie++at++sgi.com)
Mon, 18 May 1998 11:52:33 -0700
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.
You can get monitors which will handle moderately high resolution,
we saw one here which could sync to 1280x1024 120Hz (ie 60Hz stereo) but
this is better than a 120KHz line rate and that means a very expensive
monitor.
So, figure out the display you need, figure out whether you can afford
to
reduce your line count and whether you need a monitor or projected
display,
with multiple of single video feeds then you'll have a better idea of
what
kind of system capabilities you need.
Cheers,Angus
-- "Only the mediocre are always at their best." -- Jean GiraudouxFor advanced 3D graphics Performer + OpenGL based examples and tutors: http://www.dorbie.com/ ======================================================================= List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/ Submissions: info-performer++at++sgi.com Admin. requests: info-performer-request++at++sgi.com
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