Participant flying in VR.

This figure shows: (A) The labels the Head Mounted Display, which renders the virtual world on two screens, one for each of the participant’s eyes; (B) The optical tracking markers are labeled. One marker is placed on the participant’s head and two are placed in the participant’s hands. These markers track X,Y, Z position; When the participant raises her hands above her head, she flies higher in the virtual city; (C) One of the eight motion-capture cameras that track the optical marks; and (D) The orientation tracker for head rotation.