GENERATION OF CLASS B SURFACE FROM CLASS A SURFACE.
CLASS A SURFACE TO CLASS B SURFACE CONVERSION.

Class A surface:
Class A surfaces is a term used in automotive design to describe a set of freeform surfaces of high efficiency and quality.
Class A surfacing is done using computer-aided industrial design applications.

Class A surfaces can be defined as any surface, that has styling intent, that is either seen, touched or both

In an automotive application that means everything in the interior cabin and all of the exterior excluding the under body. This can also include beauty covers in the engine compartment as well as trunk panels and carpeting.

Class B surface:

Class B on which all the fitments/ slots located. It is used to provide thickness for class A surface.

Class C surface:
it is the used to join Class A and class B surfaces