1. A method for measuring the location of a hole in a workpiece comprising the steps of: projecting feature lighting, characterized by substantially uniform illumination, upon said workpiece; optically sensing said workpiece under said feature lighting to receive an image comprising comparatively light and dark areas indicative of the centroid of said hole; projecting structured lighting, characterized by a predetermined geometric pattern of illumination, upon said workpiece; optically sensing said workpiece under said structured lighting to receive an image comprising a reflected pattern defining a plane in which said hole is disposed; and determining the geometric intersection of said plane and said centroid to thereby establish the real space location of said hole.