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    A Geometric Data Manager
    (The Eurographics Association, 1983) Tikkanen, M.; Mantyla, M.; Tamminen, M.; P.J.W. ten Hagen
    GWB/DMS is the data management subsystem of GWB, the Geometric Work-Bench. I t has been designed specifically for three-dimensional computeraided design applications. As the data definition and manipulation take place with extensions of high-level language constructs, GWB/DMS offers a direct migration from an independent "in-core" application to one using a database. Besides, the user can define additional access paths using geometric or conventional indices. The interactive nature of design is taken into account by including a simple transaction control mechanism. Transparency in ordinary programming and efficiency are the main design criteria of GWB/DMS. Its novelties are: 1) geometric indices facilitating access by location, 2) address calculation as the main access method and 3) tools for controlling the "physical closeness" of database objects.
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    Solid Modeling with Parametric Surfaces
    (The Eurographics Association, 1983) Alander, J.; Mantyla, M.; RANTANEN, T.; P.J.W. ten Hagen
    Solid modeling systems are now entering industrial usage. To guarantee their wide applicability, the capabilities of solid modelers should be enhanced to allow inclusion of free-form surfaces in their geometric models, however. Based on our evolving work, we describe the methodology and some key components of a solid modeler with parametric surface processing capability. Emphasis is put on a clean and extendible design that avoids the arbitrary restrictions which often are present in current systems.