Computervision Corporation

Jason P Bronfeld

Serena M Doyle

Girish Haran

Peter Revelas

A CAD/CAM system provides a positive indication to a user that the user has located a cursor so that an object on a two-dimensional sketcher plane has been aligned with a point of interest within three-dimensional model geometry, even though the point of interest may not be within the two-dimensional sketcher plane. The object may be snapped to a projection of the point of interest onto a corresponding location on the two-dimensional sketcher plane. Additionally, an association may be defined so that further manipulation of the point of interest on the model within three dimensions will automatically result in corresponding re-location of the object on the two-dimensional sketcher plane. Additionally, to maintain an appropriate relationship among historical data of the CAD/CAM system, interim geometry, which was generated as a result of user actions performed since the user operated on a particular sketch, is removed prior to the user subsequently operating again on the particular sketch. The interim data is replaced with new data generated as a result of the subsequent sketch session.

Method and apparatus for providing three-dimensional model associativity

A method and apparatus for automatically trimming a geometry that is formed by the spatial intersection of geometric model primitives created on a computer aided design (CAD) system. In one embodiment of the present invention, an automatically trimmed representation of the geometry is determined while retaining the geometric model primitives used to determine the automatically trimmed representation. In another embodiment, the automatically trimmed representation is determined based upon a concept of sense that can be assigned to each model primitive, or inferred for each model primitive. In a further embodiment, the automatically trimmed representation is determined based upon a boolean evaluation of the spatial intersection of the geometric model primitives.

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Belmont, MA, United States of America

Jason P Bronfeld