Method for modifying a geometric object and computer aided desig

Details Method for modifying a geometric object and computer aided desig Method for modifying a geometric object and computer aided desig

1995-05-11

1997-03-25

Nguyen, Phu K.

G06F 1500

Patent

active

056153198

ABSTRACT:
In a computer aided design system, a geometric object is defined as a function, preferably a B-Spline, of a piecewise polynomial function. In order to make a local modification of said geometric object, a point of origin (P) is picked. A second point (P') is defined as a target point through which the modified function should pass. The move from the point of origin (P) to the target point (P') is transformed into a move, preferably a parallel shift, of the control points of the associated control polygons.

REFERENCES:
patent: 4821214 (1989-04-01), Sederberg
Forsey et al., "Local Refinement Editing of B. Spline Surfaces" Graphic Interface 88, 10 Jun. 88, pp. 125-126.
Rogers, David F., et al., "Dynamic Rational B-Spline Surfaces," Computer-Aided Design, vol. 22, No. 9, Nov. 1990, pp. 609-616.
Forsey, D. R., et al., "Local Refinement Editing of B-Spline Surfaces," (Abstract), Proceedings of Graphics Interface '88, Canadian Information Processing Society, Jun. 1988, pp. 125-126.

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