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Item GRAPHICS PROGRAMMING FOR KNOWLEDGE-GUIDED INTERACTION(The Eurographics Association, 1985) Tibbert, Lee; Bergeron, R. Daniel; C.E. VandoniThis paper describes a design approach that combines knowledge engineering techniques with an interactive graphics program. A prototype for specifying computer systems interactively is used to demonstrate the design approach. The program incorporates a rule-based knowledge engineering module which allows for both data base consistency and the ability to guide the user through an interactive dialogue.Item SUDS - SUrface Description System(The Eurographics Association, 1984) Moretonl, Henry P.; Bergeron, R. Daniel; K. BO and H.A. TUCKERA library of routines has been developed for the design of arbitrarily curved three-dimensional surfaces. The routines provide for the description and editing of surfaces. Surfaces are defined by families of parametric curves which are blended, using linear interpolation, approximating splines or interpolating splines. Each component curve is in turn defined by a set of ordered control points which are blended using any of these techniques. This approach affords greater flexibility than more classical methods such as bi-variate patches. The editing facilities include the basic spatial transforms as well as a full complement of attribute setting functions.