切换到顶视窗 , 将你的曲线重新拉伸缩放到如 (fig 5)( 不要超过 master_copy) ，然后按 Shift 键点选 master_copy ，选择 edit nurbs > project curve on surface 命令将曲线投影到曲面上 .
记住 : 你必须在顶视窗中投影 .
回到透视窗你将得到一些投影的曲线 (fig 6).

Fig 5


Fig 6

With the new projection curves still selected, go to menu surfaces > extrude > option box , select Distance and enter -0.15 on Extrude Length , output geometry to NURBS (Fig 7), then hit extrude, then from pers bottom view you will see this these extruded objects (Fig 8)

当新投影的曲线仍然被选择的时候，到 surfaces>extrude>option box , 将 Style 设为 Distance , Extrude Length 设为 -0.15. output geometry 设为 NURBS (fig 7), 设定好后点击 Extrude , 我们将得到如 (fig 8) 所示

Fig 7



Fig 8

Now from persp view top, select "master_copy", go to edit NURBS and trim tool, you will see that white trim areas, select every top of the inner surface (see cyan and yellow points in Fig 9), and then press Enter, you will have these new NURBS objects (Fig 10)

回到透视窗，选择 "master_copy" 将使用 edit Nurbs>trim tool, 选择你要保留的区域 (fig 9) ，并 trim 它，我们可以是到新的 NURBS 曲面 .(fig 10)

Fig 9



Fig 10

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