1. A method for displaying simulation objects, the method comprising: a computer receiving first video data of a live environment from a training device present in the live environment; concurrent with receiving the first video data, the computer running a simulation of the live environment; the computer identifying a set of simulation objects in the simulation from a number of simulation objects in the simulation using a position of the training device in which the set of simulation objects is visible to the training device in the live environment; the computer generating simulation data for the set of simulation objects, generating simulation data comprising generating graphics for the set of simulation objects; the computer combining the graphics for the set of simulation objects with the first video data of the live environment to form second video data; and the computer displaying the second video data on a display of the training device.