基于特征轮廓的立体构型方法

工程图学课程中大多数立体结构都可以看成是由特征轮廓经过拉伸、切割 或者旋转运动而成型的。结合工程图学系列课程和三维CAD 课程的教学实践，总结出一种 基于特征轮廓的立体构型方法。从立体的二维视图中提取出表现立体结构形状的特征轮廓， 经过拉伸、切割、旋转或者运动组合完成立体构型。提出了单特征轮廓、单向多特征轮廓、 双向单特征轮廓、双向多特征轮廓等立体构型方法。特征轮廓的方法，尤其是双向特征轮廓 方法可以大大简化立体的构型过程。

Solid Modeling Method Based on Feature Profiles

The modeling process of most solid structures in engineering graphics course can be seen as the results of feature profiles’ movements, usually stretching, cutting or rotating. Combining teaching practice of engineering graphics and 3D CAD course, a solid modeling method based on feature profiles is summarized. The feature profile that shows the shape of a solid is extracted from 2D views, then through stretching, cutting, rotating or the unite of them, a 3D solid is modeled. Some ramificate solid modeling methods are proposed, such as single feature profile, single direction multi-feature profile, bidirectional feature profiles, bidirectional multi-feature profiles, etc. Solid modeling process can be greatly simplified with feature profile method, especially bidirectional feature profiles method.