In some example embodiments, a method includes defining a tracking area for a first avatar in an online immersive environment, wherein the tracking area encompasses the first avatar and some defined area beyond the first avatar. The stationary unit includes teeth radially arranged around the center axis, and an insulator covering surfaces of the teeth. The protocol is implemented with a flexible packet format that supports all different modes of video data, and also supports 24 bit and 30 bit video data. The first-pass DDeff profile is refined, if necessary, to provide a second-pass DDeff profile.