Generalized B-spline surfaces of arbitrary topology
SIGGRAPH '90 Proceedings of the 17th annual conference on Computer graphics and interactive techniques
An algebraic approach to curves and surfaces on the sphere and on other quadrics
Selected papers of the international symposium on Free-form curves and free-form surfaces
SIAM Journal on Numerical Analysis
Control point surfaces over non-four-sided areas
Computer Aided Geometric Design
Two-sided patches suitable for inclusion in a B-spline surface
Proceedings of the international conference on Mathematical methods for curves and surfaces II Lillehammer, 1997
Lens-shaped surfaces and C 2 subdivision
Computing - Geometric Modelling, Dagstuhl 2008
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General construction of a two-sided surface patch of degree 2n is introduced and its main properties (degree evaluation, subdivision, etc.) are described. As an important special case the biangle patches suitable for inclusion into spline surfaces are presented. They are generalization of Sabin's two-sided patch. Applications are illustrated by freedom spline surfaces representing a sphere exactly.