Abstract:

This paper first presents a general way of calculating the weights of NURBS; the given method is of visualization, conciseness and objectivity. Then another two practical methods, in which linear interpolation and artificial neuron network (ANN) algorithms are used, are also introduced. These methods can calculate a group of initial weights of NURBS automatically according to the shape of the control polygon and the shape\|constraints of the curves.

Key words: CAD/CAM, weights of NURBS, calculation algorithms, linear interpolation, ANN