The Headset Publisher component is responsible for publishing the headset and hand poses on the ROS system. This is done by creating a TF tree with the headset and hands as children under vr_origin which is the center of the Unity scene. vr_origin is then published relative to the odom frame (will be set to the root when TF system is updated).
For the headset x is forward, y is left, and z is up. For the hands/controller x is forward, y is down, and z is right.