Today's product designer is being asked to develop high quality, innovative products at an
ever increasing pace. To meet this need, an intensive search is underway for advanced …

Feature modelling is nowadays the predominant way of product modelling, in which
geometric and functional information is stored in a single product model. The basic concepts …

The use of free-form shapes has become mainstream to design complex products that have
to fulfil engineering requirements as well as aesthetic criteria. Even if today's CAD systems …

This paper addresses the designers' activity and in particular the way designers express an
object shape in 2D sketches through character lines and how these lines form a basis for …

Geometric constraints are at the heart of parametric and feature-based CAD systems.
Changing values of geometric constraint parameters is one of the most common operations …

Numerous applications in mechanical CAD/CAM need robust algorithms for the
identification of protrusion and depression features (DP-features) on geometric models with …

The success of feature modelling systems depends to a large extent on offering user-friendly
ways for specifying and varying feature models. In this paper, several new facilities are …

The purpose of the chapter is then to review:(1) the stages of a product development pro-
cess (PDP) where free-form shapes appear and are subjected to aesthetic and functional …

Computer-Aided Geometric Design modelers are now based on powerful mathematical
curve and surface models, but efficient tools to handle, analyze and modify these objects are …

This paper proposes a novel method for the creation of user-defined freeform feature
(UDFFF) from existing surface model. The developed methodology has four major steps …