三维隧道矢量模型生成方法

Generation method of 3D tunnel based on vector model

在矢量模型的基础上设计一种隧道生成方法,在保证隧道形态正确的同时,将隧道模型的生成与连接处的平滑一次性完成。它首先在中心线上插入垂直的断面组,然后根据隧道截面形状生成一组平行线起始点,并将平行线与断面组求交,最后连接对应断面上的交点完成建模。针对隧道连接处处理这个难点,在隧道连接处插入旋转的断面组,使生成隧道体的同时又完成了连接处的平滑处理,既保证隧道无缝连接又降低了算法的复杂度。

On the basis of vector model,this paper presented a method,which could generate 3D tunnel and smooth joints at the same time while making sure the shape of generated tunnel was correct.It planted a series of vertical sections on center lines firstly.After calculating starting points of parallel lines according to the tunnel shape,it got some points by using the parallel lines intersected with sections,and finally connected the corresponding points on adjacent sections to realize modeling.Concerning the tunnel spicing problem,the method inserted rotated sections on joints,generating tunnel and smoothing the joints at the same time.It ensures the seamlessness of tunnel joints and simplifies the method as well.