绘图法中的地图投影方法可以在平面中表示一个两维的曲面，例如一个标准地图。
Map projection in cartography is a way to present a two-dimensional curved surface on a plane, such as a normal map. Figure 2 shows a Traverse Mercator projection.
用参数曲面片法进行接触判断，对于曲面的表示有连续及相容的要求，但用CAD设计的裁剪曲面并不满足这个要求。
Surface patch must be continuous and consistent for contact judgment by the method of parameter surface patch, but the trimmed surface from CAD does not suffice the request.
给出曲面、曲线的参数表示法，并且分析了参数表示法的优越性。
The parametric representations of curved surface and curve line are given. The advantage of this representation is also analyzed.
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