An automated method for generating digital specifications for the manufacture of a custom joint orthosis from a 3D model or scan. A 3D model or scan of a body or body part can be captured using a scanning device that generates a 3D point-cloud data set. A reference point is selected as an origin that measures the distance between it and critical points, either by the user or automatically through machine learning applications of feature identification. Additional biometric data, medical information, or user preference information may be incorporated to generate digital specifications for the manufacture of a supportive brace or an orthotic device. A use of the invention for medical diagnostic applications is also described.