CAD Systems Development

1 Future CAD Architectures.- The "CAD-Reference-Model": An Architectural Approach to Future CAD-Systems.- CAx Systems Architecture of the Future.- EREP Project Overview.- New ECAD System Technology.- Cooperative Product Development with heterogeneous CAD systems via EDM and Broadband Communication Technique.- 2 Product Data and Development Process.- Product Modelling for Design for Manufacture and Design for Assembly.- Extracting Reusable Product Data.- Virtual Prototyping - An Open System Environment to Support the Integrated Product Development Process.- 3 Feature Technology.- Feature validation and conversion.- Classification of generic shape features for the recognition of specific feature instances.- Stability Features for Free Form Surfaces.- Representation Scheme for Feature-based Parametric Design.- 4 Complex Surface Design.- Transfinite B-spline Interpolation with Derivates.- Surface Reconstruction and Variable Offset.- Variable-Order Surface Reconstruction Through Region Growing.- On the Conversion of Dupin Cyclide into Principal Patches.- 5 Parametric Modelling.- Extension of STEP for the Representation of Parametric and Variational Models.- A Generalised Segment Concept.- A Hybrid Constraint Solver Using Exact and Iterative Geometric Constructions.- 6 Algorithmic Aspects.- An Adaptive Algorithm to Compute the Medial Axis Transform of 2-D Polygonal Domains.- Tools for Mechanical Analysis and Simulation.- Construction Of The Constrained Delaunay Triangulation Of A Polygonal Domain.- Multiresolution Approximation of Polyhedral Solids.- Handling Very Complex Environments Using a Discrete Visibility Graph.