NDLI: Fully Free-Form Deformation Features (δ-F4) Incorporating Discontinuities

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Cheutet, Vincent Pernot, Jean-Philippe Leon, Jean-Claude Falcidieno, Bianca Giannini, Franca
Copyright Year	2004
Abstract	To limit low-level manipulations of free-form surfaces, the concept of Fully Free Form Deformation Features (δ-F4) have been introduced. They correspond to shapes obtained by deformation of a surface area according to specified geometric constraints. In our work, we mainly focused on those features aimed at enforcing the visual effect of the so-called character lines, extensively used by designers to specify the shape of an object. Therefore, in the proposed approach, 3D lines are used to drive surface deformation over specified areas. Depending on the wished shape and reflection light effects, the insertion of character lines may generate surface tangency discontinuities. In CAD systems, such kind of discontinuities is generally created by a decomposition of the initial surface into several patches. This process can be tedious and very complex, depending on the shape of the deformation area and the desired surface continuity. Here, a method is proposed to create discontinuities on a surface, using the trimming properties of surfaces. The corresponding deformation features produce the resulting surface in a single modification step and handle simultaneously more constraints than current CAD systems. The principle of the proposed approach is based on arbitrary shaped discontinuities in the parameter domain of the surface to allow the surface exhibiting geometric discontinuities at user-prescribed points or along lines. The proposed approach is illustrated with examples obtained using our prototype software.
Sponsorship	Design Engineering Division and Computers and Information in Engineering Division
Starting Page	351
Ending Page	360
Page Count	10
File Format	PDF
ISBN	0791846946
DOI	10.1115/DETC2004-57225
e-ISBN	0791837424
Volume Number	Volume 1: 30th Design Automation Conference
Conference Proceedings	ASME 2004 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
Language	English
Publisher Date	2004-09-28
Publisher Place	Salt Lake City, Utah, USA
Access Restriction	Subscribed
Subject Keyword	Geometric modelling Free-form surface Deformation Constrained-based and feature-based design Geometric discontinuities
Content Type	Text
Resource Type	Article

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