1. A three-dimensional imaging apparatus for analyzing motion of a subject, comprising: one or more structured infrared light projectors for projecting near-infrared structured light onto a subject; a plurality of near-infrared cameras for detecting reflected structured light and capturing motion of the subject, the cameras and the one or more structured infrared light projectors physically coupled to the subject; and a processor, operatively coupled to the structured light projector and the cameras, the processor programmed to convert the reflected structured light into 3D motion data of the subject.