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From: yagi@unknown.Solbourne.COM (Yukio Yagi)
Newsgroups: comp.sys.sgi
Subject: Question about Personal IRIS
Message-ID: <1990Sep4.194719.8646@Solbourne.COM>
Date: 4 Sep 90 19:47:19 GMT
Sender: news@Solbourne.COM
Organization: Solbourne Computer, Inc.
Lines: 26


I am interested in the performance numbers of the Personal IRIS.
In the "Periodic Table of the IRIS's" dated April 2, 1990 the
following numbers are given:

        Personal IRIS 4D/25G has performance of 5.1K Polygons/sec.
        Personal IRIS 4D/25TG has performance of 24K Polygons/sec.

According to the comments, "polygon" numbers are for 10x10 (100pixel),
full 24-bit color, Lighted, Gouraud-shaded, Z-buffered polygons with
arbitrary orientation.

What I want to know is:

        1. What's the meaning of "Lighted"?  Is the lighting calculation at
           each vertex pre-computed or computed at display time?

        2. How many and what kind of light sources are used?  What
           reflection model is used?

Any information is helpful.  Please e-mail or post to this group.
Thanks in advance.
                                                Yukio Yagi
                                                Solbourne Computer Inc.
                                                yagi@solbourne.com or
                                                uunet!stan!yagi