Patent
1995-05-03
1996-11-26
Nguyen, Phu K.
G06F 1500
Patent
active
055794645
ABSTRACT:
The present invention relates to a free-from surface creation method and apparatus thereof which can automatically determine such internal control points that allow a plurality of patches to form a smooth surface. Based on the four normal lines (N.sub.00, N.sub.01, N.sub.10, N.sub.11) to a quadrilateral patch A at its corners and on its four edges (E.sub.1, E.sub.2, E.sub.3, E.sub.4), reference normal lines at a plurality of points defined on each edge (E.sub.1, E.sub.2, E.sub.3, E.sub.4) are determined, and each reference normal line determined on the respective plurality of points are approximated to the normal line corresponding to the plurality of points which are defined on the edges of which are shared with the quadrilateral patch A and the adjacent patch. Therefore, the internal control points of the quadrilateral patch A are determined.
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Les Piegl, University of S. Florida, "On Nurbs: A Survey", IEEE Computer Graphics and Applications II (1991) Jan., No. 1, Los Alamitos, CA, pp. 55-71.
L. Piegl, "Key Developments in Computer-Aided Geometric Design", vol. 21, No. 5, Jun. 1989, London, GB, pp. 262-273.
Kuragano Tetsuzo
Saito Katsu
Nguyen Phu K.
Sony Corporation
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