One variation of a real-time 3D capture system for a mobile electronic device having a camera includes an infrared projector that projects a pattern onto an imaging target; an infrared sensor that captures the pattern; a control module that controls the projector and sensor, takes data from the sensor, determines depth information from the data, and transmits the depth information to the mobile electronic device; a battery that provides power to the projector, sensor, and control module; a software module connected to the mobile electronic device that controls communication of data from the camera and depth information between the control module and the mobile electronic device; a mounting bracket that removably attaches the apparatus to the mobile electronic device such that the capture system when attached maintains alignment with the camera; and a chassis that holds the projector, sensor, control module, and battery, and attaches to the mounting bracket.