Xref: utzoo comp.graphics:13317 sci.math:12322
Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!munnari.oz.au!deakin.OZ.AU!aragorn.cm.deakin.oz.au!peter
From: peter@aragorn.cm.deakin.oz.au (Peter Horan)
Newsgroups: comp.graphics,sci.math
Subject: Re: How to arbitarily break a bezier.
Message-ID: <776@sol.deakin.OZ.AU>
Date: 13 Sep 90 06:28:54 GMT
References: <1990Sep12.235912.14229@allgfx.agi.oz>
Sender: news@deakin.OZ.AU
Reply-To: peter@aragorn.cm.deakin.oz.au (Peter Horan)
Followup-To: comp.graphics
Lines: 17

See Foley Van Dam Feiner & Hughes which is open before me at the very topic pp507-514

Given the control points P1, P2, P3, P4, a Bezier curve may be split in half by computing L1 - L4 and R1 - R4
where
	L1 = P1
	L2 = (P1 + P2)/2
	H  = (P2 + P3)/2
	L3 = (L2 + H)/2
	R2 = (H + R3)/2
	L4 = R1 = (L3 + R2)/2
	R3 = (P3 + P4)/2
	R4 = P4

Draw a picture of it all. Its nice and easy.
-- 
Peter Horan
peter@deakin.oz.au