Re: GIS

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Angus Dorbie (dorbie++at++sgi.com)
Tue, 31 Aug 1999 13:06:25 -0700

Yes, but Paul had some very interesting performance optimizations which
really exploited the capabilities of the 320. As you may be aware it is
a UMA architecture with a high bandwidth crossbar/graphics ASIC, nobody
else in the industry makes anything like it.

Also, the demo did not demonstrate the performance characteristics of an
ONYX2 system even if it did beat the pants of all other PC systems
available.

Cheers,ANgus.

Atif Zafar wrote:
>
> Paul Hansen showed a demo of the Earth program (very large database) running
> on a Visual Workstation 320 at SIGGRAPH this year. He implemented a software
> clip texturing algorithm. This thing ran at 30Hz or better with real time
> data streaming off a Ciprico disk system. The same demo had been shown at
> last years SIGGRAPH on an Onyx2 IR and I was amazed that something so similar
> could be even possible on a VW.
>
> Atif Zafar
> Indiana University
>
> Fernando Mato Mira wrote:
>
> > At 04:57 PM 8/30/99 -0700, Angus wrote:
> >
> > >There are also system level requirements which I would say are extremely
> > >difficult to sustain reliably on a PC with Win32 operating systems. With
> > >large CLIP texture class databases you cannot hold them in system
> > >memory, so the approach has to be one of sustaining high bandwidth i/o
> > >from disk to system memory while paging from system memory to the
> > >graphics pipe, while performing application processing culling and
> > >rendering. That requires asynchronous data management linked to fine
> > >grained real-time texture memory updates from the draw process. All with
> > >graphics at a steady 60 Hz.
> > >
> > >It seems more than a little optimistic to say a PC can just do this.
> >
> > Not even an SGI VW running Linux?
> >
> > This would be an interactive app at 1 km ground resolution at worst (2 GB
> > texture). Some little burps wouldn't be a problem, so a best effort
> > implementation of ClipTextures would be OK.
> >
> > Thanks in advance,
> >
> > Fernando D. Mato Mira
> > Real-Time SW Eng & Networking
> > Advanced Systems Engineering Division
> > CSEM
> > Jaquet-Droz 1 email: matomira AT acm DOT org
> > CH-2007 Neuchatel tel: +41 (32) 720-5157
> > Switzerland FAX: +41 (32) 720-5720
> >
> > www.csem.ch www.vrai.com
> > <http://ligwww.epfl.ch/matomira.html>ligwww.epfl.ch/matomira.html
> >
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-- 
"One of the best-known folk theorems of software engineering is that
60% to 75% of conventional software projects are either never
completed or rejected by their intended users. If that range is
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who disputes it) then more projects than not are being aimed at goals
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