本文主要研究基于三角形和四边形的混合细分曲面的尖锐、半尖锐特征的生成方法。

Generation of sharp and semi-sharp features such as crease, cone and corner over the quad and triangle hybrid mesh is investigated.

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讨论了混合建模方法的主要研究内容，并研究了二次曲面特征和过渡曲面特征提取。

Main contents in relation to the hybrid modeling method are discussed, and some key techniques such as quadric surface feature extraction and blend surface feature extraction are addressed in details.

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