Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!vsi1!apple!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga
Subject: Re: Coke 3D
Message-ID: <10658@well.UUCP>
Date: 9 Feb 89 07:38:54 GMT
References: <8902071540.AA02699@terra.oscs.montana.edu>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Organization: Speak Before You Think Enterprises
Lines: 32
Quote: "I went to court for a parking ticket; I pleaded insanity."  -- S. Wright

In article <8902071540.AA02699@terra.oscs.montana.edu> iphwk@MTSUNIX1.BITNET (Bill Kinnersley) writes:
>How does Coke-3D work?  Would it be possible to make a Coke-3D animation
>for the Amiga?
>
	Funny you should mention that.  They've been discussing that one
rather a lot over in comp.graphics.

	Basically, it depends rather heavily on a psychophysical artifact of
the way your eye processes information.  If the light level is bright, the
information is sent to the brain quickly.  If it's dim, it takes longer for
the retina to "fire" and send the information to the brain.  Therefore, when
you darken the image received by one eye, the dark image will arrive at the
brain later than the bright image.  If things work out just right, the
undarkened eye will be seeing the current frame just as the *previous* frame
is being registered by the darkened eye.

	Now then.  If you have a lot of horizontal motion, you will get a 3D
effect, since the clear eye will see the current frame, and the darkened eye
will see the previous frame, which is shifted horizontally due to the
horizontal motion.  Thus, you get the needed parallax to perceive 3D.

	In other words, it's extraordinarly cheap, and is *extremely*
viewer-dependent.

	And yes, you can do this on the Amiga, though it will look just as
cheap.

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Leo L. Schwab -- The Guy in The Cape	INET: well!ewhac@ucbvax.Berkeley.EDU
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