Abstract: A system for tracking a gaze of an operator includes a head-mounted eye tracking assembly, a head-mounted head tracking assembly and a processing element. The head-mounted eye tracking assembly comprises a visor having an arcuate shape including a concave surface and an opposed convex surface. The visor is capable of being disposed such that at least a portion of the visor is located outside a field of view of the operator. The head-mounted head tracking sensor is capable of repeatedly determining a position of the head to thereby track movement of the head. In this regard, each position of the head is associated with a position of the at least one eye. Thus, the processing element can repeatedly determine the gaze of the operator, based upon each position of the head and the associated position of the eyes, thereby tracking the gaze of the operator.

Abstract: A method of simulating the behavior of a user-interactive environment, the method comprising: (a) running a virtual environment (VE) simulation application that (1) graphically depicts a VE, (2) receives input from a user that corresponds to a user interaction with the VE, and (3) provides graphical output to the user that corresponds to a condition of the VE; (b) running a functional simulation application that determines the condition for the VE at least in part based upon the user input; (c) communicating the user input received by the VE simulation application to the functional simulation application via a high level architecture (HLA) protocol; and (d) communicating the condition determined by the functional simulation application to the VE simulation application via the HLA protocol.