we recently used Eyesweb in a theaterproject where we tracked and analysed the motion of the performer and send out the data via OSC to various computer for further processing. Some of the dataresults in EW are in matrixformat but I use the scalarfrommatrix object which gives access to the individual cells and sent them out as scalars.
in eyesweb that you can not do in pd , witch is very faster .........
While I done several motiontracking stuff with PD /gem and being really happy with that combination, I think Eyesweb can do some more stuff in that area. So if you are into motionanalysis AND on Windows (but the guys promised me a Linux version), go give it a try.
Cheers,
Malte