head tracking support

Games like Arma or Squad implement head tracking support. This allows for the player's head to be rotated independent of his's facing and gun model.

Here's an example on how to retrieve pitch and yaw data from a wide range of head tracking software: https://github.com/opentrack/opentrack/blob/master/contrib/trackir-client/client.c

As an author of that client code and head tracking software I can provide more info and assistance, unless it requires too much experience with openxray code.

Here's a video someone made for Arma: https://www.youtube.com/watch?v=6WYNPpiSh_M