Path: utzoo!mnetor!uunet!iscuva!jimc
From: jimc@iscuva.ISCS.COM (Jim Cathey)
Newsgroups: comp.graphics
Subject: Re: CORDICS: Is Ken Turkowski there?
Message-ID: <1157@iscuva.ISCS.COM>
Date: 11 Feb 88 17:41:29 GMT
References: <6019@iuvax.UUCP> <2479@orca.TEK.COM>
Organization: ISC Systems Corporation, Spokane, WA
Lines: 29
Keywords: fractals, CORDIC

In article <2479@orca.TEK.COM> brucec@orca.UUCP (Bruce Cohen) writes:
>In article <6019@iuvax.UUCP> viking@iuvax writes:
>>Alternately, does anyone know anything about "CORDIC rotators"?  I'd like to
>>see the source to his modification of Michiel's program.  The algorithm used
>>was based on one developed by LucasFilm Ltd. and published in the Sept. '84
>>Scientific American.

>CORDIC (stands for COordinate Rotation DIgital Computer) algorithms are a
>...  The technique has been around
>since at least the '50s (1959 was the earliest citation I found in about
>two minutes of search, it was claimed to be the original paper), so I
>doubt that that part of the algorithm is what LucasFilm claims as theirs.

The LucasFilm reference is for the part of the Fractals program that
generates the mountainous landscapes, not the CORDIC routine.  The SA
article was the 'original' source for that information.  My biggest
improvement to de Panne's program was to use CORDIC rather than the
Rect->Polar+theta->Rect method he used to flip the database up to a nice
angle for viewing.  CORDIC has always been on my list of 'elegant'
algorithms.

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