home *** CD-ROM | disk | FTP | other *** search
- 91-10/3d.digitizer.info
-
- GP8-3D Sonic Digitizer:
-
- Science Accessories Corp.
- 200 Watson Blvd.
- Stratford, CT 06497
- 203-386-9978.
-
- It can send 150 3-D points per second to your host computer. Since
- three points are needed to get the 6-DOF description of the head, this
- lets you remeasure the head position and orientation 50 times per
- second. (They provide software to convert the three points into a
- 6-DOF description in your host computer, which should take less than a
- millisecond.) Unlike the electromagnetic trackers, the actual latency
- of the measurement should be less than the 20 milliseconds implied by
- the update rate, since the only cause for latency is the time it takes
- the 60kHz tone burst to propogate from your head to the sensors on the
- ceiling at about 1.1 ft/ms. Since the GP8-3D comes in models that can
- multiplex either 8 or 16 sound emitters, you could use one unit to
- simultaneously track up to 2 or 5 body parts, with the refresh rate
- for each body part being 50/sec divided by the number of body parts.
-
- The resolution and accuracy for each point measurement are .01 cm and
- .05 cm , respectively, contingent on uniform atmospheric conditions in
- the room. The maximum tracking volume is a 9 foot cube.
-
-
-
- Gaertner Research Division
- 140 Water Street
- Norwalk, Connecticut 06854
- 203-866-3200
- fax: 203-838-5026.
- It uses multiple infrared diodes mounted on the subject, and offers
- " 1 mRad accuracy, up to 240 Hz update rate, 4 ms phase lag/latency, 6
- degrees of freedom, no mapping required, magnetic & sonic noise
- immunity ..." Robert McGill at SIGRAPH says it's expensive now but
- should eventually be down around $2000. If that's true, it seems to
- me they will put all the other tracker manufacturers out of business.
- Any information to the contrary will be appreciated.
-