Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!uwm.edu!gem.mps.ohio-state.edu!apple!turk
From: turk@Apple.COM (Ken "Turk" Turkowski)
Newsgroups: comp.graphics
Subject: Re: 3D rotation
Message-ID: <4784@internal.Apple.COM>
Date: 17 Oct 89 07:54:10 GMT
References: <710@orange9.qtp.ufl.edu>
Distribution: na
Organization: Advanced Technology Graphics, Apple Computer, Cupertino, CA, USA
Lines: 13

In article <710@orange9.qtp.ufl.edu> sutherla@qtp.ufl.edu (scott sutherland) writes:
>the consensus for the fastest (or one of the fastest) ways to
>do rotation was something called the CORDIC algorithm (I think). 

CORDIC iterations give you one bit of precision each time through the loop.
Such linear convergence can be faster than other methods if multiplications
are slower than additions, which is less true of modern signal processors
that it was of PDP-11's.
-- 
Ken Turkowski @ Apple Computer, Inc., Cupertino, CA
Internet: turk@apple.com
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