I appreciate the clarification and hope you do not mind me digging deeper: How do you define ‘centre of the tracked head’ physiologically speaking (glabella/ nasion/ center of gravity/ something else)?
The reason I ask is that I am using the provided data to retarget users’ head movements to an avatar. What I aim to do is represent the head movement as realistically as possible. To not add a systematic error when displaying tracked head movement, the 3d model’s head would need to be translated and turned around the correct pivot point.