From: "Denis Chamot(resp J.Guy Fontaine)" Subject: TECH: Cheapest or more efficient Head Tracking Tecnology Date: Fri, 10 Jan 1997 12:07:27 +0100 Message-ID: <32D622EF.167E@robot.uvsq.fr> Organization: CRIIF Hi, I'm a little french student in an ingeneer college of electronics. I'm nowadays doing a training in a one of the famest robotics french lab, and my job is to find (for the lowest price) how to built an effeicient head tracker. I know some of the technologies used (as magnetic by Ascension and Polhemus for example), but I'm asking why the Ultasonic way isn't very used? Does anybody know where i can find info about all this, and can you express you way of thinking abot all this? Bye "Denis Chamot(resp J.Guy Fontaine)"