  The use of self-avatars in a VR application can enhance presence and
embodiment which leads to a better user experience. In collaborative VR it also
facilitates non-verbal communication. Currently it is possible to track a few
body parts with cheap trackers and then apply IK methods to animate a
character. However, the correspondence between trackers and avatar joints is
typically fixed ad-hoc, which is enough to animate the avatar, but causes
noticeable mismatches between the user's body pose and the avatar. In this
paper we present a fast and easy to set up system to compute exact offset
values, unique for each user, which leads to improvements in avatar movement.
Our user study shows that the Sense of Embodiment increased significantly when
using exact offsets as opposed to fixed ones. We also allowed the users to see
a semitransparent avatar overlaid with their real body to objectively evaluate
the quality of the avatar movement with our technique.
