Shape modeling method and apparatus utilizing ordered parts lists for

Abstract

In a computer operated three-dimensional shape modeler where a group of parts are to be edified, a view of the parts layout is selected by the designer and list of the parts is created in the computer memory for that view. A part in the list is designated as a target part. A designer sketches a two-dimensional figure, which relates to a design change, on surfaces of the group of parts in the layout view. A cross section of the designated target part is automatically set as a 'sketch surface'. The cross sectional shape of the selected surface of the target part is modified by the two-dimensional sketch figure. A second part is designated as the target part and that part is switched over the other parts in the list. A cross section of the second target part is also automatically set as a sketch surface. The cross sectional shape of the surface of the second target part is modified in a similar fashion as the modification to the first part. All remaining parts affected by the designer's sketch of the two-dimensional figure are designated, switched forward, sketch surfaces automatically set and their shapes modified. When all parts affected by the designer's sketch of the two-dimensional figure are modified, then the designer selects an appropriate three-dimensional shape generator. A three-dimensional shape model corresponding to the view of the group of modified parts is then generated and displayed.