Re: Texturing on MaxImpact

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Neil Phillips (neil++at++biggles.reading.sgi.com)
Wed, 9 Oct 1996 09:26:42 +0100

On Oct 8, 5:38pm, Angus Dorbie wrote:
> Subject: Re: Texturing on MaxImpact
> Well said,
>
> these two issues seem to get raised together every time with IMPACT.
>
> Since you mentioned the amazing new O2, there's no danger of you using RM6
> levels of framebuffer memory since the O2 won't Multisample but you can
> still can line antialias or accumulate.
>
> O2 will use 32 bit or 16 bit pixels and you can select 16 or 32 bit Z.
> If you don't have a truckload of RAM

Sounds like a sales opportunity to me!!

Regards,

Neil (The token salesman on info-performer)

PS. Hello Angus! See you in November!

> you don't have to loose what you've
> got to the framebuffer. O2 will dither 16bit rgba when that's what you
> need.
>
> At the risk of a little confusion confusion you'll be glad to hear that
> O2 supports the much lamented RGBA 1555 format which everyone would like
> on IMPACT.
>
> Cheers,
> Angus.
>
>
>
> On Oct 8, 12:48am, Dennis Pierce wrote:
> > Subject: Re: Texturing on MaxImpact
> > Hello folks!
> >
> > I've seen a seemingly straight-forward question take at least
> > one fork, so here's an attempt to rejoin the paths.
> >
> > 1. The default number of bits per texel used on the RE and IMPACT are
> > DIFFERENT. This is not only based on the amount of TRAM installed,
> > either none, 1 MB or 4 MB, but also on just what has been "selected"
> > as the default by whoever wrote what demo you're viewing. In
> > the "Performer Town" demo refered to initially, the fewer number
> > of bits allocated to each chromatic band in the RGB texel does
> > lend itself to "banding" in the textured road. 16-bits for RE
> > vs. 12-bits for IMPACT means that 5-bits R is now compressed to
> > one-half the visual range, namely 4-bits. Similarly for G and B.
> >
> > 2. Ever since the PI, SGI's desktop machines (of which the IMPACT
> > is one) have used 12-bit frame buffers. Deskside and rack machines
> > have used 24-bit frame buffers. The 12-bit frame buffer leads to
> > what some have correctly called dithering. Remember "virtual 24"?
> > That was the original purple Indigo slogan and still lives. O2
> > does not follow this trend, but remember one RM6 has 160 MB of
> > frame buffer RAM, so you may approach the 1 GB main memory limit
> > by the time you configure a great color space, throw in the OS,
> > and tuck in your app. :^)
> >
> > So, there are two issues which are distinct but seem to be becoming
> > blurred in this thread.
> >
> > Hope this helps and good luck to all!
> >
> > bye.
> >
> > --
> > Dennis Pierce
> > POB 321206 CCB FL 32932
> > 407.783.7656
> > dpierce++at++digial.net
> > http://www.digital.net/~dpierce
> > =======================================================================
> > List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> > Submissions: info-performer++at++sgi.com
> > Admin. requests: info-performer-request++at++sgi.com
> >-- End of excerpt from Dennis Pierce
>
>
> =======================================================================
> List Archives, FAQ, FTP: http://www.sgi.com/Technology/Performer/
> Submissions: info-performer++at++sgi.com
> Admin. requests: info-performer-request++at++sgi.com
>-- End of excerpt from Angus Dorbie

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