Re: GIS

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Atif Zafar (zafar_a++at++regenstrief.iupui.edu)
Tue, 31 Aug 1999 09:19:11 -0700

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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