An implicit curve is used to specify the motion path while a speed profile curve is adopted to describe the motion timing.
隐曲线用于指定行为动画的运动路径,速度曲线用于描述运动的时间分布。
参考来源 - 基于隐曲线的速度插值算法研究与实现 in C·2,447,543篇论文数据，部分数据来源于NoteExpress
There are two kinds of curve definitions: implicit curve and parametric curve.
前言： 空间三维曲线有两种数学表达形式：隐式方程曲线及参数方程曲线。
It is proved that the intersecting line of the two curved surface is space curve, and the equation is quartic implicit function with one unknown.
论证了两曲面的交线为空间曲线，其方程为一元四次隐函数关系式；
For NC machining of plane section method, the machining path of tool cutting plane and implicit surface can be found, and the curve of the tool path is drawn by the positive-negative method.
把隐函数的优势应用到数控加工编程中，即对于截面法的数控加工，求出刀具切削平面与隐函数曲面的加工轨迹，再用正负法绘制刀具轨迹曲线。
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