System and method for direct modeling of fillets and draft angle

Details System and method for direct modeling of fillets and draft angle System and method for direct modeling of fillets and draft angle

1995-10-30

1998-03-24

Jankus, Almis R.

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

G06T 1700

Patent

active

057318166

ABSTRACT:
A system and method for direct modeling of fillets and draft angles include forming a fillet region having a first transition from a surface feature to the fillet region and a second transition from a base surface to the fillet region while maintaining a predetermined continuity at the first and second transitions. The system and method select (75) a general form of a fillet profile with a single basis function to describe the fillet, apply (76) the fillet profile to either side of a constant central region on the surface feature to form a surface feature profile, and sweep (77) the surface feature profile within the feature boundary to form the fillet region. The present invention allows such fillet regions to be subsequently modified while maintaining the predetermined continuity at the first and second transitions by applying a reparametrization (78) to the basis function to modify the fillet region.

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Stewart, P. J., "Direct Shape Control Of Free-Form Curves And Surfaces With Generalized Basis Functions", Ph.D. dissertation, Dept. of Naval Architecture and Marine Engineering, University of Michigan, 1991, 219 pgs.
Vince, John, "3-D Computer Animation", Addison-Wesley Publishing Company, Inc., copyright 1992, pp. 53-73, 143-145, 148-169, 240-247.
Watt, Alan, et al., "Advanced Animation And Rendering Techniques", Copyright 1992 by the ACM Press, pp. 65-110, 395-405.

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