Results 181 to 190 of about 6,889 (229)
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An optimization of NURBS interpolation algorithm
IEEE 10th International Conference on Industrial Informatics, 2012I put forward a new interpolation called Adams-Bashforth interpolation of NURBS (Non-Uniform Rational B-Splines) curve in order to realize higher precision under the condition of satisfying the speed demand. IN this method, I calculated next parameter point by Adams-Bashforth equation and I used difference equation instead of derivation.
Jingmeng Liu +4 more
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2007 Third International IEEE Conference on Signal-Image Technologies and Internet-Based System, 2007
We describe a novel NURBS surface fitting method to a human face model. Our first step is to resample of the original mesh model. The next step we fit a tensor product NURBS surface to the grid points. Our method is characteristic in that we use only one patch to fit the model.
Ken Yano, Koichi Harada
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We describe a novel NURBS surface fitting method to a human face model. Our first step is to resample of the original mesh model. The next step we fit a tensor product NURBS surface to the grid points. Our method is characteristic in that we use only one patch to fit the model.
Ken Yano, Koichi Harada
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Generalized NURBS curves and surfaces
Geometric Modeling and Processing, 2004. Proceedings, 2004A 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.
Qing Wang 0042 +3 more
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Shape computations with NURB curves
Artificial Intelligence for Engineering Design, Analysis and Manufacturing, 2018AbstractFreeform curves are commonly used in contemporary design practices, especially with digital modeling tools. We investigate facilitating shape subtraction and addition with two-dimensional (planar) non-uniform rational basis-spline (NURB) curves with the codes and conventions of modeling while preserving the visual continuity of curved shapes ...
Elif Ensari, Mine Özkar
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Tessellating trimmed nurbs surfaces
Computer-Aided Design, 1995The 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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DNurbs: DNA modeled with NURBS
Journal of Molecular Graphics, 1994DNurbs (dee-in-urbs) are a small number of bicubic patches wrapping each base pair in complementary DNA. NURBS, the nonuniform rational B-spline surfaces now popular in computer graphics, are employed for the patches. Control points for the surface patches are generated from the molecular surface based on canonical base pairs.
M, Carson, Z, Yang
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Biarc approximation of NURBS curves
Computer-Aided Design, 2002An algorithm for approximating arbitrary NURBS curves with biarcs is presented. The main idea is to approximate the NURBS curve with a polygon, and then to approximate the polygon with biarcs to within the required tolerance. The method uses a parametric formulation of biarcs appropriate in geometric design using parametric curves.
Les A. Piegl, Wayne Tiller
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2010
In this chapter we are going to explore some advanced modeling techniques, mostly suited for curved or wirelike structures that would prove tricky to model as a straight polygon mesh. The techniques covered in Chapter 3 are good for modeling most items, but there are times when a specialist tool makes the job easier.
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In this chapter we are going to explore some advanced modeling techniques, mostly suited for curved or wirelike structures that would prove tricky to model as a straight polygon mesh. The techniques covered in Chapter 3 are good for modeling most items, but there are times when a specialist tool makes the job easier.
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Proceedings. Computer Graphics International 2001, 2002
Frederick W. B. Li, Rynson W. H. Lau
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Frederick W. B. Li, Rynson W. H. Lau
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Generating NURBS curves by envelopes
Computing, 1992The author considers nonuniform rational \(B\)-spline (NURBS) curves which are rational one-parametric curves in 3D of order \(k\). The envelope of a family of NURBS curves of order \(k\) is a curve defined by the properties that at every one of its points it is tangent to at least one curve of the family and, secondly, it is tangent to every curve of ...
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