一抛物圆锥面
曲线方程：
/* For cartesian coordinate system, enter parametric equation
/* in terms of t (which will vary from 0 to 1) for x, y and z
/* For example: for a circle in x-y plane, centered at origin
/* and radius = 4, the parametric equations will be:
/* x = 4 * cos ( t * 360 )
/* y = 4 * sin ( t * 360 )
/* z = 0
/*-------------------------------------------------------------------
x = 1 + (4 * t)
y = 2 + (3 * t) + (5 * t ^2)
z = 0
发表于 2003-7-28 13:52:57
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发表于 2003-7-28 16:02:48
发表于 2003-7-28 18:29:24
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