用于生成六边形阵列，同时根据约束可以变成各种阵列形状。-Used to generate hexagonal arrays, at the same time under the constraint can be turned into the shape of a variety of arrays.

Sketch- and Constraint-based Design of B-spline Surfaces-Sketch-and Constraint-based Design of B-spline Surfaces

and split. Although this topological constraint may be reasonable in the segmentation of the liver, it would certainly be undesirable when segmenting blood vessels in an MR image. An algorithm to overcome these diculties was rst introduced by

飞机发动机设计中约束曲线的绘制，适用于简单的飞行器设计，其中参数需要根据实际情况进行修改。(Drawing Constraint Curve in Aircraft Engine Design)