1. A computing system, comprising: a depth camera configured to capture depth information; an aiming assembly configured to selectively change an aiming vector of the depth camera; a logic subsystem in operative communication with the depth camera and the aiming assembly; and a data-holding subsystem holding instructions executable by the logic subsystem to: receive from the depth camera one or more observed depth images of a scene; instruct the aiming assembly to aim the depth camera so that the aiming vector points to a default far focus if a target is within a far range; and instruct the aiming assembly to aim the depth camera so that the aiming vector points to a default near focus, relatively closer to the depth camera than the default far focus if the target is within a near range, relatively closer to the depth camera than the far range.