返回绑定指向的浮点曲线。
Unity 自动在内部组合位置曲线、缩放曲线和旋转曲线。
因此，变换曲线始终组合在一起，它们的关键帧始终是所有关键帧点的并集。
在 Editor 中，AnimationClip 允许您指定不会进行组合的特殊编辑器曲线，从而让用户能够以更加直观的方式编辑曲线。
另请参阅：AnimationUtility.GetObjectReferenceCurve。
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