问题：Animator播放动画第一次正常显示，播放完动画，接下来都不显示。

Culling Mode 默认设置是 Cull Update Transforms，改为Always Animate。

(1) Always Animate :Always animate, don’t do culling even when offscreen.

(2)Cull Update Transforms:  Retarget, IK and write of Transforms are disabled when renderers are not visible.

(3)Cull Completely:  Animation is completely disabled when renderers are not visible.