What is Generative Shape Design in CATIA and when is it used?

Generative Shape Design (GSD) is a CATIA workbench for creating and manipulating complex wireframe and surface geometry. It is used when solid modeling cannot achieve the required shapes, such as aerodynamic surfaces, car body panels, or aesthetic consumer products. GSD provides tools for creating splines, surfaces (extruded, loft, blend, fill), surface operations (trim, split, fillet), and analysis tools for curvature and draft evaluation.