关键词: 联合细分, 插值曲线, 特征构造, 复合曲线网, 曲面

Abstract: In order to improve modeling capacity of combined subdivision surface, according to the characteristics of combined subdivision, parameter adjusting method and compound curve network construction method were presented. The former was to adjust second derivatives on cross curves according to the specified feature angles during a few times'subdivision and acquired features on interpolated curves. The latter was to separate the features construction from the generation of global surface, and compound curve networks，which were composed of base curve network and feature curve network，was defined. By applying the modified combined subdivision rules, the interpolation surface with features was created. Experimental results showed that the influencing area of the features generated by these two methods could be adjusted flexibly, but the total quality of the surface generated by the latter method is relatively higher. Combination of these two methods solved the difficult problem of constructing features on combined subdivision surfaces and enhanced the modeling capacity of combined subdivision method.

Key words: combined subdivision, interpolating curve, feature construction, compound curve networks, second derivatives on cross curve, surface