Javier Castellar (javier++at++sixty)
Wed, 27 Mar 1996 20:04:01 -0800
The closest configuration at 60hz that works is:
5 x 960x680+60 + 1024x768_60
If you wish to reduce the actual "rendering" resolution is some of the 960x680
channels you could get more 1024x768
Or you can work with 6 channels at 1024x768_60 or 1280x1024 and use the dynamic
resolution in function of the viewer position. (like a modern version of the
old area of interest)
Regarding the fill rate perfomance of the RM6 we have measured 220 Mpixels/s
but in a typical visual simulation application you can see from 155 to 180
(depending of the databases). Anyway keep in mind that with the dynamic
resolution feature you don't need to design the system to the worst case in the
database.
-Javier
On Mar 27, 8:18pm, Hill_Brian++at++amelnx.advmar.com wrote:
> Subject: Infinite Reality Pixel Processing
> Hello out there in performer/SGI land.
>
> Does anyone have any experience with the Infinite Reality systems?
>
> Here are some numbers I have heard and that form the basis of my question:
>
> RM performance 155 Mpixels/sec/RM
> DG performance 310 Mpixels/sec
>
> I have a situation where I want to run 6 channels 1024x768 from a
> single IR pipe with an MCO. My calculation for pixel performance would be:
>
> First look at RMs:
>
> 1024 x 768 x 30 Hz x 2.5 depth x 6 channels = 354 Mpixels
>
> This would require 3 RMs. 3 x 155 = 465 Mpixels which is more than 354.
>
> Now look at DG:
>
> 1024 x 768 x 60 Hz x 6 channels = 283 Mpixels
>
> This should work because 283 < 310.
>
> I heard from someone who heard from someone (who might have been
> an SGI sales rep) that the only way to do this was to reduce the
> Display Generator scan rate from 60 Hz to 50 Hz.
>
> Can someone tell me if this is true or not?
>
> Running at 50 Hz would limit my realistic scene update rate to 25 Hz
> which isn't OK.
>
> I am very interested in knowing if and why I would have to do this?
>
> Thanks,
>
> Brian
>
>
>-- End of excerpt from Hill_Brian++at++amelnx.advmar.com
-- ************************************************************************* * Javier Castellar Arribas * Email: javier++at++asd.sgi.com * * * Vmail: 3-1589 * * Member of Technical Staff * Phone: (415)-933-1589 | 933-2108 (lab) * * Applied Engineering * Fax: (415)-964-8671 * * Advanced Systems Division * MailStop: 8L-800 * ************************************************************************* * Silicon Graphics Inc. * * 2011 N. Shoreline Boulevard, * * Mountain View, California 94043-1386, USA * ************************************************************************* "Violence is the last refuge of the incompetant" Hari Seldon
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