wjp.vri...@quicknet.nl wrote:
> Hello FlightGear developers,
> 
> In the FlightGear forum I stumbled upon a request from users, to enable head 
> tracking in FlightGear (head tracking that is i.e. provided by Freetrack or 
> TrackIR). Until now, I found no evidence that someone has embraced this 
> request, so I would like to jump in...
> 
> As you may know, the mentioned 'head trackers' have one great disadvantage: 
> they require the user to wear a hat (or something similar) with Infrared 
> LED's attached to it, to enable tracking. Recently I have made a head 
> tracking program, based on the FaceAPI from SeeingMachines, which ONLY 
> requires a simple web cam.  By now, we only support the Freetrack-protocol 
> (which is open-source) and are seriously testing it with ArmA 2 (actually, 
> the first attempt gives really promising results).
> 
> On the FlightGear forum, I found a reference to a program made by Anders 
> Gidenstam (http://www.gidenstam.org/FlightGear/HeadTracking/) in which he 
> states that it is possible to send UDP-packets to FlightGear, with head 
> tracking data in it. I am currently implementing his information in my 
> program (which I call FaceTrackNoIR, by the way) and I think I can start 
> testing the results soon. There is, however, one problem: I have no 
> experience whatsoever with FlightGear.
> 
> Could someone tell me, in a brief manner, how I can enable FlightGear so that 
> it will listen to my UDP-packets? It would also help, if someone could tell 
> me what data FlightGear expects in the packets...

It is described in the protocol configuration file:
http://www.gidenstam.org/FlightGear/HeadTracking/headtrack.xml

run: fgfs --generic=socket,in,<period>,,<port>,udp,headtrack

where <period> is the update period in Hz

It uses the generic protocol in binary mode to set the internals of 
FlightGear (See README.IO and README.protocol in FlightGear/data/Docs 
for more information).

Erik


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