From: "Mark Anthony Brown;E200" Subject: Ultrasonic position detection Date: 30 Sep 91 14:40:54 GMT Greetings, Does anybody have any information as to the accuracy/operation of ultrasonic trackers used in VR hardware? I've heard that the Mattel power glove uses ultrasonics for tracking. The only other information I've got is on Sutherland's original HMD, which used continuous wave ultrasonics or (shudder) a mechanical arm attached to the user's head. Comparative performance information for ultrasonics versus electromagnetic trackers would also be much appreciated. Thanks in advance, Mark. -- Mark A. Brown | Ham radio callsign: G1ZVT | Department of Computer Science | telephone: +44 71 975 5220 | Nothing exceeds Queen Mary & Westfield College | UUCP: eeyore@qmw-dcs.UUCP | like excess. Mile End Road, London E1 4NS | JANET: eeyore@uk.ac.qmw.dcs |