InterSense, a developer of "motion-tracking systems for human interaction with virtual environments and 3D graphics," is introducing a set of devices that it hopes will make its systems attractive to "high-end consumers and professionals."

　　The InterTrax 20 and 30 motion trackers are designed for use with most high-end PCs and can run on DOS, Windows 95/98 or NT, Mac, UNIX, Sun, and SGI systems. An adapter plate comes with both InterTrax systems; the plate attaches to the back of any head-mounted display system. InterTrax then plugs directly to a PC serial port. The InterTrax system measures the 3D motion of a user's head, hands, and body and allows "unrestricted movement through a virtual world."

　　InterTrax 20 will sell for US$795; InterTrax 30 for $995.

　　"With our flagship inertial and ultrasonic trackers, the IS-300 and IS-600, we were able to make virtual environments viable business solutions," said Charlie Miller, InterSense CEO. "Now, with our new line of motion trackers, the InterTrax 20 and 30, both at a lower price point, we can make the benefits of our sourceless inertial tracking technology available to an even broader professional and consumer market. With InterTrax, there is no disorienting slosh and jitter because it is based on InterSense's patented drift-corrected gyroscopic technology."

　　The first application of this technology won't be in games, however. InterSense plans to integrate its product into the Sony GlassTron and StairMaster FreeRunner, a sort of virtual reality fitness training system.