Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!rutgers!rochester!pt.cs.cmu.edu!andrew.cmu.edu!po0o+ From: po0o+@andrew.cmu.edu (Paul Andrew Olbrich) Newsgroups: comp.graphics Subject: Re: 3-D perceptual abilities Message-ID: Date: 1 Feb 89 19:51:04 GMT References: <6382@thorin.cs.unc.edu> <25652@sgi.SGI.COM> <985@wasatch.UUCP> <35258@bbn.COM>, <1104@nic.MR.NET> Organization: Carnegie Mellon, Pittsburgh, PA Lines: 42 In-Reply-To: <1104@nic.MR.NET> John Camp writes: > As one who has experience viewing stereo and other 3-D representations, I wish > to report that stereopsis alone gives me a sensation of "viewing fatigue", > possibly because stereo so vividly presents SOME depth cues while perversely > witholding others. This is a personal experience, NOT a rigorous criticism of > stereoptic display. I have a similar problem, but I think it's due to the fact that the vision in my right eye isn't perfect (things get fuzzy at about four feet away) but my left eye is 20/20. Under normal circumstances I really don't notice this because my good eye compensates completely. I don't wear glasses or contacts. As someone mentioned earlier, most stereoscopic 3D vision effects occur within a few feet of your eyes. Outside that range, the two images your eyes send back to your brain are almost identical. When I watch a 3D movie, obviously, the 3D effects occur on the screen, which is beyond the "clear vision" range of my right eye. So half of what I see is blurry, just as usual, but now my brain is being told to attempt to extract a 3D image from a blurry and non-blurry image. Normally it never has to do this because the two images fed to it to produce 3D are both clear (because they're close.) In a standard movie, there's just one image that both eyes share ... one's fuzzy, and I guess my brain just ignores it. Just an idea, anyway .. I don't know how accurate that is. 3D movies are usually somewhat annoying to watch though. Oops ... In the above, I was remembering the first 3D movie that I saw, which was a B-rate sci fi flick using polarized glasses. About two years ago, I saw another one at Epcot Center (in Disney World). I remember that it wasn't nearly as troublesome to watch and that I enjoyed it a lot more, visually speaking. Maybe more care was taken in the filming or something ... I also have rediculously light-sensistive blue eyes, see well in the dark, and really hate being outside without sunglasses during mid-summer ... I can't look more than a few degrees above the horizon without having to turn away. Two summers ago I remembering trying the play volleyball and really having a hard time of it because I didn't have sunglasses on ... Nobody else seemed to mind the sun. That's not important for 3D, though, I suppose. Comments welcome ... - Drew -- Drew Olbrich po0o+@andrew.cmu.edu