Basic curvature: Understanding polygon count and its importance in creating smooth curvature.
基本曲率：了解多边形数量及其在创建平滑曲率中的重要性。
In this article, the authors study the trimming of a random smooth curve in a plane polygon and present an arithmetic for it, with the conclusion drawn from the concept of traversing point.
研究了平面任意封闭区域对平面任意光滑曲线的裁剪，提出光滑曲线对封闭区域的穿越点概念，并以穿越点为依据，给出了平面任意封闭区域对光滑曲线的裁剪算法。
The new four kinds of subdivision schemes is not only to keep smooth of limit curve, but also has excellent quality of keeping shape of initial polygon.
这一类细分模式在满足极限曲线的光滑性外，还具有保持初始多边形形状的优良性质。
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