A B-spline curve extension algorithm

B-spline curve extension is an important operation in computer aided design systems. In this paper,we present a new extension algorithm for B-spline curves. The algorithm uses curve unclamping to generate a uniform B-spline curve segment from the origina  (本文共9页) 阅读全文>>

Science China(Information Sciences)

B-spline surface fitting to mesh vertices

Here we propose a novel method of fitting B-spline surfaces to input mesh vertices.For a mesh model that is difficult to fit with one B-spline surface,we divide it in...  (本文共3页) 阅读全文>>

Transactions of Nanjing University of Aeronautics and Astronautics

Compact Car-Body Surface Design with T-spline Surface

Creating proper B-spline surface models is a very challenging task for designers in car-body surface design.Due to the tensor-product structure of B-spline surface,some undesirable issues of the redundant control points addition,incomplete surface definition and the difficulty of trimming boundary alteration frequently occur,when designing the car-body surface with B...  (本文共7页) 阅读全文>>

Computer Aided Drafting,Design and Manufacturing

Knot Insertion Algorithms for ECT B-spline Curves

Knot insertion algorithm is one of the most important technologies of B-spline method. By inserting a knot the local properties of B-spline curve and the control flexibility of its shape can be further improved, also the segmentation of the curve can be realized. ECT spline curve is drew by the multi-knots spline curve with associated matrix in ECT spline space; Muehlbach G and Tang Y and many others have deduced the...  (本文共7页) 阅读全文>>

Computer Aided Drafting,Design and Manufacturing

G~0 and G~1 connection between two adjacent B-spline surfaces

In this paper,the smooth connection between two B-spline surfaces is discussed.First,a brief proof of some simple sufficient conditions of G~0 and G~1 continuity is given.On this basis,a novel method for G~0 or G~1 connection between two adjacent B-spline ...  (本文共5页) 阅读全文>>

Journal of Zhejiang University-Science C(Computers & Electronics)

Non-uniform B-spline curves with multiple shape parameters

We introduce a kind of shape-adjustable spline curves defined over a non-uniform knot sequence.These curves not only have the many valued properties of the usual non-uniform B-spline curves,but also are shape adjustable under fixed contr...  (本文共9页) 阅读全文>>