应用开源OpenCasCad几何引擎，展示了一些CAD功能，给初学者一个启发。-Based on OpenCasCad geometry engine with open source， some functions are demonstrated which can be useful to learner.

VB和最新版本的OCC结合开发程序包括一些建模方法介绍-VB combined with the OCC and the latest version of the development program, including some of the modeling method described