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From: dds3769@ultb.isc.rit.edu (D.D. Simmons)
Newsgroups: comp.graphics
Subject: Re: 3D Animation Source Code Wanted
Message-ID: <1865@ultb.isc.rit.edu>
Date: 5 Jan 90 06:22:23 GMT
References: <2910@dogie.macc.wisc.edu>
Reply-To: dds3769@ultb.isc.rit.edu (D.D. Simmons)
Organization: Information Systems and Computing @ RIT, Rochester, New York
Lines: 24

To who ever posted the rather offensive note. I don't put myself so far
above other people that I can not stop to help them.

Back before I bought an Amiga 2000, I began doing some graphics
animation on Apple II. At the heart of those simple programs was two
elements. The first was a double buffered screen. The second was a
set of equations that translated 3-d points to 2-d coordinates
for the screen. 

I don't recall if you mentioned what computer you were using or if 
did, but setting up a double buffered screen shouldn't be too difficult.

The two equations that I used are as follows:

	h = X cos Ax + Y cos Ay + Z cos Az
	v = X sin Ax + Y sin Ay + Z cos Az

	h and v are your screens horizontal and vertical coordinates
	X, Y, and Z are the 3-d space coordinate
	Ax, Ay, and Az is the angle of view to the 3-d coordinate system

 Hope this helps. Your note brings back memories of rotating a cube
on a monochrome screen. Send me mail if you need more detailed 
information or help.