All shaped hull panels can be divided into two major groups, the developed and non-developed panels. Developed panels are shaped in one dimension, by bending the panel along one or multiple lines. A flanged panel requires bending at one point of the panel and a cylindrical or conical panel needs to be bent on multiple lines.
Non-developed panels are those hull panels that are shaped in two dimensions, also known as compound curvature or complex panels. Physically, these panels require elongation (stretch) along specific lines next to bending. Typical examples of non-developed hull panels are: