Head tracking a Head-Mounted Display (HMD) with VRMeer and VRPN

[clowngerrie]

There is influence from metallic components, but we try and avoid to have that close to either the emitter or the receiver. You could get funny results, just as we experienced with a "hidden" steel bar underneath a wooden table, which would "bend" space. Or, when the sensor is positioned too close to active electronic circuitry in the HMD. You can improve performance of the tracking by performing some sort of grid-based calibration.

[paulmabbutt]

How accurate do you find the Polhemus Fastrak? I've read the specs that it shouldn't be affected by electrical equipment, but interested to know if this is true in practice. I know some trackers need re-calibrating every so often, especially magnetic trackers. Is this the case with this one?