HYBRID——A Solid and Surface Modeling System Based on Database

HYBRID is a solid and surface modeling system. Using set operations and local op erations, user can create complicated objects by primitives or 2 D profiles. CSG and B-rep data structure are used to represent the geometrie and topologie information and record the process of design. The system is orgaaized by database, so graphic and non-graphic data can be processed integra tedly. Non-uniform rational B-spline surface is used to interpolate curves into surface modeling. Af ter user has defined a path and sections, the system generates B-spline surface and outputs Bezier patches as the result.