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From: bennett@sgi.com (Jim Bennett)
Newsgroups: comp.sys.sgi
Subject: Re: Question about Personal IRIS
Message-ID: <1990Sep5.000824.12575@odin.corp.sgi.com>
Date: 5 Sep 90 00:08:24 GMT
References: <1990Sep4.194719.8646@Solbourne.COM>
Sender: news@odin.corp.sgi.com (Net News)
Organization: Silicon Graphics, Inc., Mountain View, CA
Lines: 27

In article <1990Sep4.194719.8646@Solbourne.COM> yagi@unknown.Solbourne.COM (Yukio Yagi) writes:
>
>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?

The normals are sent down with the vertices and the color values are
computed at display time.

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

Single light source, and the default reflection model (infinite viewer).

Jim Bennett			(bennett@esd.sgi.com)