Re: Hardware for multi-sample

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Angus Dorbie (dorbie++at++sgi.com)
Fri, 12 Mar 1999 09:59:41 -0800

P.S.

hmm... RM8's are not Reality Engine boards.

Do you mean a ONYX2 Reality?

That'll anti-alias but there is a fill performance penalty.

If you intend to antialias you will be slightly faster with a 1RM
infinite Reality than a 2 RM Reality in fill, and you get double the
geometry performance. Something worth bearing in mind when making your
decision.

You can anti-alias with 1RM on Reality at 1280x1024.
You can antialias 2*1280x1024 at about 3 times the pixel fill rate with
1 RM on infinite Reality.

If you don't anti-alias on the Reality the fill performance is the same
as infinite Reality. 2RM's in the Reality will get you a lot closer to
1RM infinite Reality fill performance and it'll be double the infinite
Reality fill performance if you don't anti-alias.
Regardless on numbers of RM's the Reality can only transform geometry at
half the rate of infinite Reality.

Cheers,Angus.

Angus Dorbie wrote:
>
> Yes, it'll multisample at 1280x1024.
>
> RM's are going cheap too:
>
> http://www.sgi.com/products/remanufactured/fillbound.html
>
> Cheers,Angus.
>
> Scott Herod wrote:
> >
> > What is the lowest cost hardware that supports
> > multi-sampling for polygon anti-aliasing? Can a RE
> > with 2 RM8s do it?
> >
> > Thanks,
> >
> > Scott Herod
> > scott++at++evt.com
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-- 
"Only the mediocre are always at their best." -- Jean Giraudoux


For advanced 3D graphics Performer + OpenGL based examples and tutors:
http://www.dorbie.com/

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