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From: bolson@carson.u.washington.edu (Edward Bolson)
Newsgroups: comp.graphics
Subject: Sphere from 4 points?
Date: 15 Apr 1993 20:25:34 GMT
Organization: University of Washington, Seattle
Lines: 18
Distribution: world
Message-ID: <1qkgbuINNs9n@shelley.u.washington.edu>
NNTP-Posting-Host: carson.u.washington.edu

Boy, this will be embarassing if it is trivial or an FAQ:

Given 4 points (non coplanar), how does one find the sphere, that is,
center and radius, exactly fitting those points?  I know how to do it
for a circle (from 3 points), but do not immediately see a 
straightforward way to do it in 3-D.  I have checked some
geometry books, Graphics Gems, and Farin, but am still at a loss?
Please have mercy on me and provide the solution?  

Thanks,
Ed


-- 
Ed Bolson
University of Washington  Cardiovascular Research               (206)543-4535
bolson@u.washington.edu (preferred)
bolson@max.bitnet                bolson@milton.u.washington.edu (if you must)
