B-spline is the most popular method to present free-formcurve and surface, and DP algorithm is the effective approach for solving discrete optimization problems.
样条方法是当前自由曲线曲面造型最为常用的方法，动态规划为解决离散最优化问题的有效手段。
2
The shape of streamlined train head is made of the 3-dimensional space freeform surface, whose shape outline curve USES NURBS curve and complex shape surface USES 3-d NURBS surface.