Next, in the interior of the patches, surface fitting points and cross boundary derivatives are estimated from the reference curves by constructing virtual iso-parametric curves.
其次，在曲面片内部，曲面拟合点和边界方向导数可以从参考曲线中通过构建虚拟等参线的方法得到。
The 3D surface can be defined directly by the boundary curve of the patch surface. The surface will be C1 continuous if the boundary curves connecting each two patches are C1 continuous.
利用曲面网格的边界曲线直接定义3D曲面，既能保证曲面的光滑过渡，即C1连续，又可避免通过确定扭矢来达到控制曲面的复杂计算。
In this method, the laminated shell structure is divided into patches and represented by parametric surfaces that are connected in boundary according to C0 continuity.
该方法首先将壳体结构的参考曲面进行分片处理，利用参数曲面来描述分片的壳体参考曲面并将分片按照C 0连续性进行拼接。
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