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用曲面Spline方法表示1900~1936年中国(部分地区)地磁场及其长期变化的分布

根据1936.0年426个地磁测点和28个IGRF计算的地磁数据,计算地磁场和地磁异常场各个分量的曲面Spline模型,并绘制相应的地磁图和地磁异常图.依据我国部分地区的1909~1915,1915~1920,1920~1930,1930~1936年间地磁偏角长期变化图,1908~1917,19  (本文共10页) 阅读全文>>

《Science China(Information Sciences)》2017年07期
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>>

《Science China(Information Sciences)》2016年03期
Science China(Information Sciences)

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>>

《Transactions of Nanjing University of Aeronautics and Astronautics》2014年06期
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》2013年02期
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》2013年01期
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>>