eye point/eye direction/up vector -> lookat (FAQ?)

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From: Tim Hall
Date: Tue, 22 Dec 1992 03:11

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Given the eye point, eye direction and up vector how do I compute the
twist value given to lookat?

Thanks.

-- 
-Tim Hall
I felt the water coming up to my chin, up to my nose.  When I woke up
my body was all greasy from the holy oil.  I remember being disappointed
I was still alive.  -Harry Call

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Newsgroups: comp.sys.sgi.graphics
Path: arc1-ca.pugleaf.net!sparky!uunet!world!tjh
From: tjh@world.std.com (Tim Hall)
Subject: eye point/eye direction/up vector -> lookat (FAQ?)
Message-ID: <Bzn4v1.F7r@world.std.com>
Organization: The World Public Access UNIX, Brookline, MA
Date: Tue, 22 Dec 1992 03:11:24 GMT
Lines: 10