To start, I have TrackIR Ultra4 and Freetrack but prefer the latter by a long mile in terms of setting up and FT having axis hotkeys which are really useful in combat. The seting up of the Clip is from the mid point between the 'ears' (in your 'skull' so so to speak). In reality this is very much an estimate and I find has little impact on actual performance in game if the entered dimensions are wrong. What I do find is that these dimensions can be actually altered to suit how close or far you like to be from the monitor the screen and the location of the camera. FT is an excellent piece of software but unfortunately (AFAIK) will not be supported in CoD other than in mouse emulation (or similar alternatives). Hence why I have kept my TrackIR and not sold it!
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