Yarn appearance simulation based on NURBS surface

In view of the appearance simulation of the yarn,this paper established a yarn cross-section model to determine the control vertex of yarn.Non-uniform rational B-spline(NURBS) algorithm was used to fit the points and form the appearance of the yarn,and by modifying the power factor,anti-insert node and the control vertex,the yarn surface was modified.The modification method of control vertex has been improved so that modification of the shape of the yarn surface can be affected by simultaneously modifying a number of control vertexes.The experimental results show that this algorithm for yarn simulation ensures that the appearance of the yarn surface is relatively stable.All of these three methods can make simulation of yarn appearance.Among them,the third method has the best simulation effect and achieves the expected purpose.