Disclosed herein are methods, compositions and tools for repairing articular surfaces repair materials and for repairing an articular surface. The distributed shell includes a shell server, which is located on a server computer system. Moreover, second weights defining fluences of the illumination distributions are determined such that a deviation between a provided fluence map and a fluence map formed by a combination of illumination distributions, which are defined by the respective determined extensions and the respective second weight, is minimized. The audio interface includes a left ear audio pin, a right ear audio pin, and a ground pin.