利用方程式:
1、 首先建立缺省的datum plan,coordinate system
2、 建立datum curve ,选择 from equation
3、 选择coordinate system, 圆柱坐标(cylindrical)
此时出现下列信息:
/* For cylindrical coordinate system, enter parametric equation
/* in terms of t (which will vary from 0 to 1) for r, theta and z
/* For example: for a circle in x-y plane, centered at origin
/* and radius = 4, the parametric equations will be:
/* r = 4
/* theta = t * 360
/* z = 0
/*-------------------------------------------------------------------
其中螺旋线的方程式为:
r = minimum radius of helix + t * (major radius of helix - minimum radius of helix)
theta = t * (pitch of helix * 360 * leading angle (if any)
z = desired height + t
不记得在那里看到的了柱座标,你试试
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