Method for removing blends in B-rep models

Details Method for removing blends in B-rep models Method for removing blends in B-rep models

2007-06-26

2007-06-26

Nguyen, Phu K. (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

C345S440000, C345S619000, C345S620000

Reexamination Certificate

active

10866134

ABSTRACT:
A computer-based feature suppression method is used in removing a blend chain formed by a set of blend faces, and creating a new model without the blend faces. Blend recognition is used to determine the support faces, spring edges and cross edges for each blend face of the blend chain. The method further includes classifying the edges of the blend faces into spring edges, cross edges, and other edges, determining the other blend chains which interact with the blend chain of interest, separating the interacting blend chains from the blend chain, and deleting the blend face of the blend chain after separating thereof from the interacting blend chains. The cross edges of the blend faces in the blend chain are used to find the blend for which a face is missing between the blend face and the support face. In one implementation the identified blend chains are deleted by extension or contraction of neighboring blend faces so as to patch-up deleted regions.

REFERENCES:
patent: 6760038 (2004-07-01), Venkataraman et al.
patent: 6995762 (2006-02-01), Pavlidis et al.
Venkataraman et al., Blend Recognition Algorithm and Applications, Solid Modeling, ACM, May 2001, pp. 99-108.
Venkataraman et al., Removal of Blends from Boundary Representation Models, Solid Modeling, Jun. 2002, pp. 83-94.

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