Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!samsung!dali.cs.montana.edu!milton!brucec%phoebus.labs.tek.com@RELAY.CS.NET From: brucec%phoebus.labs.tek.com@RELAY.CS.NET (Bruce Cohen;;50-662;LP=A;) Newsgroups: sci.virtual-worlds Subject: Re: rambling on motion Message-ID: <11085@milton.u.washington.edu> Date: 13 Nov 90 19:09:09 GMT References: <10924@milton.u.washington.edu> <10958@milton.u.washington.edu> <110 Sender: hlab@milton.u.washington.edu Organization: Tektronix Inc. Lines: 36 Approved: hitl@hardy.u.washington.edu In article <11012@milton.u.washington.edu> 23r@sage.cc.purdue.edu (John Dormer) writes: > How many views are there in a 3-view drawing? Three. Think about it...only > 3 cameras needed to locate any point fairly well. Four would make it complete > and not very awkward, but for most things three should do ok. Draftspeople get away with 3 views because they're allowed to draw hidden lines. Unfortunately, hree views is usually not enough, and four is often not enough, for tracking all hand and finger motion. Move your arms around while twisting your wrists and wiggling your fingers and I think you'll convince yourself that you can hide some positions and gestures from almost any pair of reasonably separated views. Again unfortunately, you really need to get stereopsis to get the fine placement of small parts like the fingers, which means that *every* significant part of the body must be in at least two views at all times. Now I will grant that a lot of those gestures will be somewhat silly, but by no means all of them. And it's a basic principle of user interface design that the user knows what she wants to do better than the interface designer. I see no reason why someone shouldn't be able to build a gesture interface based on the ceremonial magic of the Order of the Golden Dawn, which tends to use sweeping arm movements during which finger position is significant. (see "True Names" for a use of gesture in system interface). -- --------------------------------------------------------------------------- Speaker-to-managers, aka Bruce Cohen, Computer Research Lab email: brucec@tekchips.labs.tek.com Tektronix Laboratories, Tektronix, Inc. phone: (503)627-5241 M/S 50-662, P.O. Box 500, Beaverton, OR 97077