Re: GIS

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Jenny Zhao (zhz++at++dandan.engr.sgi.com)
Thu, 9 Sep 1999 12:31:01 -0700

On Sep 9, 10:52am, Fernando Mato Mira wrote:
> Subject: Re: GIS
> At 09:57 PM 9/8/99 -0700, you wrote:
>
> >This is all referring to the use of many images which total > texture
> >memory, not a single image which is > texture memory.
>
> I guess one is doomed then if one wants to use pfASD
No, not true :)
By design, each pfASD face has a geostate ID which is indexed into
a geostate table. Therefore, you can have multiple textures
assigned to a single pfASD.
Each vertex in a face can be assigned a texture coordinate.
The idea is to let geometry (pfASD) be independently defined from texture
(Cliptexture or regular textures), similar to the idea
of cliptexture which is to separate out texture from geometry (pfASD or regular
gset).

Since ASD is work in progress, the paging ASD format does not handle
texture coordinates yet.

>
> >> http://www.s3.com/s3tc/s3tcoglext.htm
> >
> >Looks like that's exactly what they have done.
> >This spec does seem to have a severe flaw. The pixels format says that
>
> And I don't see it as an unnumbered extension in
>
> http://reality.sgi.com/ljp_engr/registry/
>
> which is even worse.
>
> 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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>-- End of excerpt from Fernando Mato Mira

-- 
Jenny Zhao        zhz++at++engr.sgi.com     650 933-5091	IRIS Performer Manager

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