Results 161 to 170 of about 14,416 (204)

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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Computing offsets of NURBS curves and surfaces

Computer-Aided Design, 1999
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Piegl, Les A., Tiller, Wayne
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Direct highlight line modification on nurbs surfaces

Computer Aided Geometric Design, 1997
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Chen, Yifan, Beier, Klaus-Peter, Papageorgiou, Dimitris   +2 more
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Geologic Modelling Using Parametric NURBS Surfaces

Proceedings, 2016
Most reservoir modelling/simulation workflows represent geological heterogeneity on a pillar-grid defined early in the modelling process. However, it is challenging to represent many common geological features using pillar grids: examples include intersecting faults, recumbent folds, slumps, and non-monotonic injection structures such as salt diapirs ...
C. Jacquemyn, Y. Melnikova, M.D. Jackson, G.J. Hampson, C.M. John   +4 more
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Measurement-based modification of NURBS surfaces

Computer-Aided Design, 2002
A frequent requirement in computer aided design and manufacture is to update or refine an existing CAD model using measured data. Least squares surface fitting is known to suffer from stability problems, caused by an insufficient measurement density in some regions.
Djordje Brujic, Mihailo Ristic, Iain Ainsworth   +2 more
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NURBS-compatible subdivision surfaces

2010
Two main technologies are available to design and represent freeform surfaces: Non-Uniform Rational B-Splines (NURBS) and subdivision surfaces. Both representations are built on uniform B-splines, but they extend this foundation in incompatible ways, and different industries have therefore established a preference for one representation over the other.
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