From: owner-3dui@hitl.washington.edu on behalf of Anders Backman [andersb@cs.umu.se] Sent: Thursday, October 11, 2001 2:12 PM To: 3d-ui@hitl.washington.edu Subject: VR8 + Ascention = problems Hi all. Im wondering if anyone else have have experienced the following problems: We have a Virtual Research VR8 (probably the most common HMD) and a Ascention Motionstar (equal to FlockOfBirds, except for a Ethernet interface). We are experiencing interference problem from the HMD:s fan. When the sensor is held close (or at the sensor mounting point at the HMD) to the fan, the sensor returns really noisy data. The orientation and position swings like being ombord a ship in a really severe storm! Moving the sensor just a feet or so from the fan, reduces/removes the problem. Also shutting down the HMD (fan) works. SO I guess we can really blame the fan in the HMD. The problem is slightly less when the sensor is really close to the transmitter. As the sensor magnetic field is stronger than the interfearence field from the fan. We have approached both Virtual Research as well as Ascention regarding this, but there seems to be no solution. We have changed the fan in the HMD, but nothing helps. So is there anyone out there that have experienced the same problems, and is there a solution? I guess that shutting the fan down is a potentially really bad solution! ________________________________________________________________ Anders Backman Email: andersb@cs.umu.se HPC2N/VRlab Phone: +46 (0)90-786 9936 Umea university Cellular: +46 (0)70-392 64 67 S-901 87 UMEA SWEDEN Fax: +46 90-786 6126 http://www.cs.umu.se/~andersb