IP Library › Granted Patent US 7,170,516
Granted Patent B2
US 7,170,516 · App. 11/063,880 · Granted Jan 30, 2007

Approximation of Catmull-Clark subdivision surfaces by Bezier patches

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Quick Facts
Patent No.
US 7,170,516
App. No.
11/063,880
Granted
Jan 30, 2007
Kind
B2
Abstract

A method for converting a subdivision surface, such as a Catmull-Clark subdivision surface, into a cubic Bezier surface defined by sixteen control points. The method includes (a) converting a subdivision face to Bezier control points using a conversion matrix using fifteen points and a dummy value for an unavailable sixteenth point; and (b) replacing one of the Bezier control points which corresponds to an extraordinary point on the subdivision face with the extraordinary point's limit point.

Claims (6)

1. A method, comprising:

converting a subdivision face of a computer based model containing an extraordinary point to a Bezier patch of the model defined by Bezier control points; and

adjusting a Bezier control point to improve the conversion and displaying the patch.

2. A method, comprising:

converting a subdivision face of a computer based model with a creased edge to a Bezier patch of the model defined by Bezier control points; and

adjusting a Bezier control point to improve the conversion and displaying the patch.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Sep 18, 2006
From: ALIAS SYSTEMS CORPORATION
To: AUTODESK, INC.
Reel/Frame 018375/0466 →