检索绑定指向的浮点曲线。
Unity 在内部组合位置曲线、缩放曲线和旋转曲线。当曲线组合时，关键帧将设置为所有关键帧点的并集。在编辑器 AnimationClip 中，您可以指定不会组合的特殊编辑器曲线，并允许用户以更直观的方式编辑曲线。
另请参阅：AnimationUtility.GetObjectReferenceCurve。
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