As large-scale interfaces for displaying scientific data advance, a call is made for novel schemes for interacting with such data beyond the traditional, repetitive interface of the mouse and keyboard. The motion capture technology incorporated extensively by filmmakers offers one option for such an interface. However, a user of such a system must usually don obtrusive equipment such as gloves or even full body suits in order to facilitate effective tracking of the appropriate portions of the body. A more user-friendly approach would obviate the need for such equipment, tracking the user passively with highly functional imaging devices, for example. This research presents an outline for such a tracking system as well as preliminary work towards its construction.