From:	"Ted Gress" <gress AT mbcomp DOT com>
Newsgroups:	comp.os.msdos.djgpp
Subject:	I need to find the center of a triangle in 3D space, help!
Date:	Fri, 30 Jan 1998 21:52:46 -0500
Organization:	LebaNet
Lines:	16
Message-ID:	<6au3is$6lk$1@newton.leba.net>
NNTP-Posting-Host:	207.77.85.92
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

I am creating my own graphics library that does alpha-blending,
anti-aliasing, tri-linear buffering, and all that stuff (software based)....

My only problem is I need to know how to rotate around the objects center,
so i need to know how to rotate around the center of a triangle!! Right now,
it is rotating around the origin and looks horrible.

Does anyone know how to find the center point of a triangle from the
coordinates of 3 vertices?? And does anybody know the formula (without
matrices! !yikes!) to rotate an object around a specific point? Like if i
wanted to rotate a triangle around point (2,2,1)??  [x,y,z]

Thanx for your help!!

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