Results 141 to 150 of about 917 (180)
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NURBS-compatible subdivision surfaces
2010Two 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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Interactive Rendering of Deforming NURBS Surfaces
Computer Graphics Forum, 1997Non‐uniform rational B‐splines (NURBS) has been widely accepted as a standard tool for geometry representation and design. Its rich geometric properties allow it to represent both analytic shapes and free‐form curves and surfaces precisely. Moreover, a set of tools is available for shape modification or more implicitly, object deformation.
Frederick W. B. Li +2 more
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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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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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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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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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