Patent ID: 9269189
Filing Date: 2016-02-23
CPC Classification: G06F,G06T

Claim Text:
1. A computer-implemented method comprising: receiving an input boundary representation (B-rep) face and an associated functional trimming curve; constructing a trim-free T-spline control mesh for a NURBS surface control grid of the input B-rep face; aligning the trim-free T-spline control mesh with the functional trimming curve; and generating a representation of the input B-rep face using untrimmed bicubic surface patches for each of one or more faces in the aligned trim-free T-spline control mesh that are adjacent to the functional trimming curve, wherein each bicubic surface patch is represented by a variable knot spline, and wherein at least one bicubic surface patch has a first sum of knot intervals on a first edge of the patch that does not equal a second sum of knot intervals on an opposing second edge of the bicubic surface patch.