Conversion of a hierarchical subdivision surface to nurbs

Details Conversion of a hierarchical subdivision surface to nurbs Conversion of a hierarchical subdivision surface to nurbs

2005-02-22

2005-02-22

Wong, Don (Department: 2821)

Computer graphics processing and selective visual display system

Computer graphics processing

Three-dimension

Reexamination Certificate

active

06859202

ABSTRACT:
A method of converting a subdivision surface to a NURBS representation. Adjacent faces of a subdivision surface are merged into a quadrilateral region, and vertices of the rectangular regions are used to generate a NURBS surface. The merging of faces reduces the number of vertices needed. Faces should not be merged if they do not comprise a quadrilateral region; if they cross an extraordinary point; if they cross a crease; or a face has already been merged. Imaginary vertices can be generated if not enough vertices are present for a face in the subdivision surface to create a corresponding NURBS patch for that face.

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Tony DeRose et al., “Subdivision Surfaces in Character Animation” Computer Graphics Proceedings, Annual Conference Series. Jul. 19-24, 1998.

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