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我们使用的通用技术称为三次样条，但我们进行了改进。 三次样条允许点之间的三次插值。 索引或 x 轴可以是时间或主轴的位置。
https://deltamotion.com/education/videos/curvetool/curvetool.htm
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The general technique we use is called cubic splines, but we have made improvements.Cubic splines allow cubic interpolation between points. The index or x axis can be time or the position of a master axis.
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