关键词: NURBS曲面, 映射, 匹配, 节点向量, 参数域

Abstract: Aiming at the poor practicability of existing surface graphic mapping methods，A new graphic mapping technique on a NURBS surface is presented.Based on the shape of the surface，a planar graph is designed or selected firstly，the extreme positions of the planar graph are then determined.According to the location and size of the final mapping graph on the NURBS surface，the knot vectors and limit parameters of the surface are modified to match the planar graph，then all the elements in the planar graph are inserted into the parameter domain of the surface.The mapping graph on surface is achieved by NURBS theory.The examples show that the proposed method is simple and stable and it has stronger adaptability and practicability.

Key words: NURBS surface, mapping, matching, knot vector, parameter domain