1. Method for reconstructing the three-dimensional shape of the surface ( 14 ) of at least a portion of an ear canal ( 18 ) and/or of a concha, said method comprising—for each of a multitude of points ( 12 ) on said surface ( 14 )—the step of using a chromatic coded distance measurement technique for determining a distance value ( 40 ) representative of a distance to said point ( 12 ); and further comprising the step of reconstructing said three-dimensional shape based on said multitude of distance values ( 40 ).