本文求出了一些曲面集的亏格分布的显式表达式。
In this paper, expressions of the genus distribution for certain sets of surfaces are provided.
该方法通过二次曲面求管线表面轮廓方程进而求得管线的型值点集。
With this method, shape points were calculated by surface outline equation got from quadratic surface.
ACIS是一种三维几何造型引擎，它集线框、曲面和实体造型于一体，为各种3d造型应用的开发提供了几何造型平台。
ACIS is a prominent 3d modeling engine, which integrating wireframe, surface, and solid modeling in itself, supplies a geometric modeling platform for different 3d modeling applications.
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