Ran Yakir (rany++at++rtset.co.il)
Sun, 15 Dec 1996 06:18:54 -0800
The answer lies in the title of the question : it is all a matter of
fill speed. The RE2 goes with either RM4 or RM5, which has the same
performance. The fill performance of one RM is declared to be 55M
pixels/sec for textured antialiased pixels, and 90M pixels for non
textured pixels. The number of tri-linear interpolations/sec is even
less - about 40M pixels/sec/RM. Assuming you will get almost this number
(you shoud get close), then with 2RM you get 110M pixels for tex-AA. If
you sum your pixels you get something like 4.5M pixels
(100*125*125/2+900*75*75/2+1000*50*50/2). You can't squeeze this into
about 100M pixels 30 times.
Ran
Jude Anthony wrote:
>
> Machine: Irix 5.3 RE^2 2RM2 Performer 2.01
>
> We just made a scene consisting of 2000 tris, 100 of which are
> 125x125, 900 of which are 75x75, and 1000 of which are 50x50. None
> of the polygons are completely occluded, but some are overlapped.
>
> We're supposed to be able to run at 30Hz with this scene, but we're
> getting 15Hz at best.
>
> The weird thing is that our real-life scenes contain upwards of
> 10,000 variously-sized polygons and run just fine. We think the
> problem is the amount of time necessary to fill all those polygons.
>
> Anybody have a suggestion on how to speed things up?
>
> Thanks,
> Jude Anthony
> jude++at++p3.enzian.com
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