Patent US 5,990,897

Techniques are developed for defining an engine which has as its input two-dimensional drawing views, wherein the engine produces a three-dimensional geometric solid. The engine comprises, among other things, a set of rules for identifying particular elements within the various two-dimensional views, and for determining the useful relationships between elements (e.g., arcs, lines, and the like) in one view vis-a-vis related elements in another view, to thereby ascertain the three-dimensional form defined by these elements and their corresponding relations to other elements.