Results 211 to 220 of about 6,844,739 (267)

Tessellating trimmed nurbs surfaces

Computer-Aided Design, 1995
The problem addressed by the authors is triangulation of a surface given by rational tensor splines over a single parameter patch but with arbitrary holes and boundary curves. The simplicial approximation is required to stay within an \(\varepsilon\) distance from the surface in space.
Piegl, Leslie A., Richard, Arnaud M.
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Surface approximations using generalized NURBS

Engineering with Computers, 2021
We extend the concept of generalized NURBS (GNURBS), recently introduced by the authors for parametric curves, to bivariate parametric surfaces. These generalizations are obtained via either explicit or implicit decoupling of the weights along different physical coordinates.
Alireza H. Taheri, Krishnan Suresh
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Expressing Coons-Gordon surfaces as nurbs

Computer-Aided Design, 1994
The authors combine the techniques of the well-known Boolean-sum approach to Gordon/Coons surfaces with that of the \(B\)-spline representation of curves and surfaces; what comes out is a quite nice method for the \(B\)- spline-representation (linear and to some extend rational) of Gordon/Coons surfaces.
Lin, Fenqiang, Hewitt, W. T.
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Fast ray tracing NURBS surfaces

Journal of Computer Science and Technology, 1996
In this paper, a new algorithm with extrapolation process for computing the ray/surface intersection is presented. Also, a ray is defined to be the intersection of two planes, which are non-orthogonal in general, in such a way that the number of multiplication operations is reduced.
Kaihuai Qin, Minglun Gong, Geliang Tong
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From NURBS to C-NURBS: II — C-NURBS Surfaces and C-Bezier Triangles

Volume 2: 19th Computers and Information in Engineering Conference, 1999
Abstract This paper develops c-NURBS surfaces and c-Bezier triangles. The projection from 6D homogenous space to 3D vector space developed in previous papers [12, 13] is applied to surfaces. As a result, a c-NURBS surface can be constructed using bicubic patches to interpolate the given control points with the de Boor-Cox algorithm ...
Manhong Wen, Kwun-Lon Ting
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Constraint-Based NURBS Surfaces Manipulation

2009 International Workshop on Intelligent Systems and Applications, 2009
This paper presents a method for applying systems of constraints at a series of points on a NURBS surface and describes an efficient technique for the interactive application. By applying systems of constraints and minimizing the changes of control net in least-square sense, geometric features (such as position, partial derivative and normal vector) at
Xiaoyan Liu, Feng Feng
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Watermarking NURBS Surfaces

2005
The popularity of the worldwide web and the easy availability of the digital content has brought the security issues to the forefront. NURBS is widely used in computer-aided geometry design and computer graphics for its strong representative properties. In this paper, we present a blind watermarking algorithm for NURBS surfaces.
Zhigeng Pan, Shusen Sun, Mingmin Zhang, Daxing Zhang   +3 more
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UTD computation for NURBS surfaces

2012 6th European Conference on Antennas and Propagation (EUCAP), 2012
One of the main problems in computing the UTD surface diffracted fields on surfaces described by Non-Uniform Rational B-splines (NURBS) is due to the difficulty in determining the geodesic paths the electromagnetic waves takes along the surface. In this paper we discuss some of the numerical algorithms that are used for computing surface diffraction on
Manushanker Balasubramanian, Alberto Toccafondi, Stefano Maci   +2 more
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Generalized NURBS curves and surfaces

Geometric Modeling and Processing, 2004. Proceedings, 2004
A representation, the generalized NURBS (G-NURBS), is proposed for modeling parametric curves and surfaces. G-NURBS provides a unified framework for traditional parametric curve and surface. G-NURBS surface based on arbitrary irregular mesh can represent closed surface or trimmed surface with only one surface patch.
null Qing Wang, null Wei Hua, null Guiqing Li, null Hujun Bao   +3 more
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Representing quadric surfaces using NURBS surfaces

Journal of Computer Science and Technology, 1997
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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