Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!ucbvax!ucsfcgl!pixar!flip From: flip@pixar.uucp (Flip Phillips) Newsgroups: comp.graphics Subject: Re: polarized film? Keywords: 3-D, film, stereo-viewing Message-ID: <7176@pixar.UUCP> Date: 10 Oct 89 17:52:26 GMT References: <475@alias.UUCP> <65539@tut.cis.ohio-state.edu> Sender: news@pixar.UUCP Reply-To: flip@pixar.uucp (Flip Phillips) Organization: Pixar -- Marin County, California Lines: 31 In article <65539@tut.cis.ohio-state.edu> william c ray writes: :Well, I may just be an idiot, and someone may have some magical way of doing :2 polarized images overlaid on the same piece of film, (and Pixars may drop :to $15 tomorrow...) But if I were to do a polarized 3d film, and I'm only a :punky undergrad, with no experience here, I would project *2* simultaneous :strips usicross polarized polarizers, one on each projector, but what :would I know? : :Will Ray Well, yep, thats right. (Not the $15 pixar thing... but the polarizing stuff) The films were calculated with one strip for each eye, two projectors were synchronized together, and a polarizing filter was placed on each projector. This presented an 'encoded' picture of horizontal and vertical polarized light on the screen, and your glasses 'decoded' it. Simple... Seems a silver screen is necessary also, my guess would be due to the light scattering non-uniformily on a white screen, thus throwing the polarization off. There are also under/over doohickies where you print the right and left images, half size in the vertical dimention, on the same frame of film. Then, a special lens with a splitter reads each seperate image, polarizes it and projects it. Saves you from having to have two synched projectors but then you only have a half sized image... tradeoffs, tradeoffs. Flip Phillips {sun | ucbvax}!pixar!flip Pixar - Marin County, California