Described herein is a technique for creating a 3D face model using images obtained from an inexpensive camera associated with a general-purpose computer. In some implementations, the prompt itself can navigate the user to the controls for the correction feature. The sum signal is calculated from optical signals from detectors in an optical pick-up unit of the optical disk drive. An embodiment of a method of identifying an object includes introducing the object to the nanomechanical resonance detector.