Results 181 to 190 of about 2,313 (216)
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Measurement-based modification of NURBS surfaces
Computer-Aided Design, 2002A 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 +2 more
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Matrix representation for NURB curves and surfaces
Computer-Aided Design, 1990A procedure of generating a matrix representation for non-uniform rational B-spline (NURB) curves and surfaces is developed. The authors provide the explicit matrix forms up to degree three. They also find that the matrix form of NURB is very efficient and fast compared to the Cox-de Boor recursive forms and Boehm's knot insertion algorithm.
Choi, B.K. Choi, Byoung Kyu +2 more
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Smooth connection of trimmed NURBS surfaces
Proceedings of the sixth ACM symposium on Solid modeling and applications, 2001An automatic smooth surface connection method that has the capability of tension control is presented. Given two trimmed NURBS surfaces, the new method constructs a smooth connection surface to connect the trimming regions of the trimmed surfaces at the trimming curves.
Pifu Zhang, Fuhua Cheng
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Tessellation of trimmed NURB surfaces
Computer Aided Geometric Design, 1996zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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On increasing the developability of a trimmed NURBS surface
Engineering with Computers, 2004Developable surfaces are desired in designing products manufactured from planar sheets. Trimmed non-uniform rational B-spline (NURBS) surface patches are widely adopted to represent 3D products in CAD/CAM. This paper presents a new method to increase the developability of an arbitrarily trimmed NURBS surface patch.
Charlie C. L. Wang +2 more
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Blind watermarking of NURBS curves and surfaces
Computer-Aided Design, 2013This paper presents two watermarking methods for NURBS curves and surfaces. Both methods are blind, shape-preserving and data amount-preserving. These features are often required in watermarking of CAD models. The first method is based on the replacement of exterior knots of NURBS.
Jianjiang Pan +2 more
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Incremental Polygonization of Deforming NURBS Surfaces
Journal of Graphics Tools, 1999Nonuniform rational B-splines (NURBS) are a powerful tool to model deformable objects. Their shapes can be easily modified by moving the control points. A common method used to render these objects is polygonization. However, the polygonization process is computationally very expensive.
Frederick W. B. Li, Rynson W. H. Lau
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Representing quadric surfaces using NURBS surfaces
Journal of Computer Science and Technology, 1997zbMATH Open Web Interface contents unavailable due to conflicting licenses.
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NURBS for Curve and Surface Design.
Mathematics of Computation, 1993From the Publisher: NURBS (nonuniform rational B-splines) promises to be the future geometry standard for free-form curves and surfaces. This volume contains recent results and new NURBS techniques and developments--the most important being curve/surface from the CAD/CAM industry. The book has been carefully refereed.
Larry L. Schumaker, Gerald Farin
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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, 1999Abstract 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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