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