Head tracking logging & realtime data

[tmcw]

Hi, two questions -

First off, with the work we'll be doing, it'll be useful if we can keep track of where the person is and where their head is pointed during the trial. What's the best way to do this? If it doesn't exist specifically, I can write the code, but I can't figure out where to start.

Also, is it possible to get head position & rotation data during a simulation, and to make the simulation itself transparent (as in, the person sees the computer desktop instead of the 3D visualization). I ask because I'm thinking about writing the necessary mouse control and connector code to make a sort of VR interface to Google Earth and/or Street View, or something of that sort.

Thanks for any help!