From news@athena.ulaval.ca Mon Jun 12 11:00:57 1995 Return-Path: Received: from mx4.u.washington.edu by stein2.u.washington.edu (5.65+UW95.05/UW-NDC Revision: 2.33 ) id AA19224; Mon, 12 Jun 95 11:00:57 -0700 Received: from hitl-new.hitl.washington.edu by mx4.u.washington.edu (5.65+UW95.05/UW-NDC Revision: 2.31 ) id AA21401; Mon, 12 Jun 95 11:00:56 -0700 Received: from relay4.UU.NET (relay4.UU.NET [192.48.96.14]) by hitl.hitl.washington.edu (8.6.12/8.6.12) with ESMTP id LAA06337 for ; Mon, 12 Jun 1995 11:00:55 -0700 Received: from athena.ulaval.ca by relay4.UU.NET with SMTP id QQytvk19373; Mon, 12 Jun 1995 14:00:52 -0400 Received: by athena.ulaval.ca (5.x/SMI-SVR4) id AA15996; Mon, 12 Jun 1995 13:56:04 -0400 To: sci-virtual-worlds@uunet.uu.net Path: ppp076-stdkn2 From: mbernat@gel.ulaval.ca (Marc Bernatchez) Newsgroups: sci.virtual-worlds Subject: [ON LINE] HMD-Resolution (new version of the text) Date: 12 Jun 1995 17:56:04 GMT Organization: dep. de Genie electrique Lines: 72 Message-Id: <3rhv3k$f3a@athena.ulaval.ca> Nntp-Posting-Host: ppp076-stdkn2.ulaval.ca X-Newsreader: News Xpress Version 1.0 Beta #3 Status: OR [ This part is for the moderator only Toni, The following file in the FAQ repository is out of date. You may replace it with what will follow if you wish, bye. HMD-Resolution 3 Kb Wed Mar 29 11:20:00 1995 End of moderator note] Hi all, I would like to submit to all of you some calculations I made to compare HMD resolutions regardless of their types and optics. Note that this is a second version of the text previously posted the this group. My reference is a person looking at a 14" PC screen at a distance of about 1 meter. The FOV is 25 degrees. Let's assume the display is at 1024x780 pixels. This gives 1.46 arc minutes per pixel horizontally. Now let's look at the CyberMaxx. The LCDs are about 267x225 (in triads of colors). The FOV is 56 degrees horizontal. So we get 12.58 arc minutes per pixel. Finally, the VFX1. The LCD resolution is 278x204 (in triads of colors). The FOV is 46 degrees. With this one, the angular resolution is 10.36 arc minutes per pixel. Just to get an idea of measures, the CAE electronics fiber optics HMD is about 2.5 arc minutes per pixel in the fovea region as stated in the May 95 issue of VR NEWS. It's about 5 arc minutes per pixel in the peripheral region. So I interpret it this way. The VFX1 will give better sharpness than the CyberMaxx BUT it will give you more of a "tunnel" sensation and less immersion effect. In fact, it would be more appropriate to speak of tunnel vision for the i-glasses. The VFX1 and the CyberMaxx are much alike as long as the FOV is concerned. The CyberMaxx, even if it shows larger pixels than the VFX1, will give a reasonable feeling of immersion. A FOV of 60 degrees is considered to be the minimum to get immersion in a VR environment. What is great about this is that it's a measure of the resolution that is independent of the viewing device, LCD or CRT based. However, don't jump too fast on conclusions. You must also evaluate the FOV which is very important to create the feeling of immersion. I've read some articles from people and they seemed to say that a FOV increase gives more gain than a resolution increase. It all depends on what you plan to do with the HMD. If manufacturer would adopt this formulation, it would be more easy to really evaluate the strength of their products IMO. Some are already taking the turn on that. I have put up a Web page on this topic that shows all these considerations with nice graphics and charts. It is located at: http://www.gel.ulaval.ca:80/~mbernat/analyhmd/analysis.html I would love to hear your comments about all that. Bye. Note: the resolution spec. where taken from the May 95 issue of VR NEWS (vol.4 Issue 4). The calculations are still mine but perfectly correspond to the ones found in the article. Reassuring I gess ;-) Bye all. ========================================================================== == Marc Bernatchez = E-MAIL == == C.O.P.L.(GEL plt-00307) = mbernat@gel.ulaval.ca == == Dep. Genie electrique = or == == Universite LAVAL = marc.bernatchez@gel.ulaval.ca == == Quebec, Canada =============================================== == G1K 7P4 = Virtual Reality is the future of computers == == = http://www.gel.ulaval.ca/~mbernat == ==========================================================================