From: utzoo!decvax!harpo!floyd!vax135!ariel!hou5f!npoiv!npois!houxm!houxa!houxi!houxz!ihnp4!ixn5c!inuxc!pur-ee!davy
Newsgroups: net.movies
Title: How does 3-D Work? - (nf)
Article-I.D.: pur-ee.833
Posted: Thu Mar 10 01:27:24 1983
Received: Fri Mar 11 03:34:00 1983

#N:pur-ee:7000029:000:822
pur-ee!davy    Mar  9 22:29:00 1983


	Last night I saw a double feature of two 3-D movies.  We won't
	discuss the technical merits of them, because there weren't any.
	I purposely went on dollar night, because I had never seen a 3-D
	movie before, and was curious.

	Now I'm thinking though:

		How do these 3-D movies work?  They give you a set
	of glasses, with one red and one blue lens.  So, I gather 
	that one eye gets one image, and the other eye gets another
	image.  The thing I don't get is:

		1. How does seeing two different copies of the same
		   image make it 3-D?  Are the images "next to each
		   other", or "one closer than the other", or what?

		2. How come when I took the glasses off, the movie 
		   was in color, but when I put them on, it was in
		   sort of black and white (except for yellows, etc.)?

--Dave Curry
pur-ee!davy