| animator | 评估状态机的 Animator。 |
| stateMachinePathHash | 状态机完整路径的哈希值。 |
在进入状态机的过渡开始后的第一个更新帧调用。实现此消息可以影响进入子状态机的过渡。
注意:
- 此消息仅在进行状态机入口过渡时调用。如果直接过渡到状态机子状态，则不会调用它。
- 由于此消息在评估状态机期间被调用，并且可以影响所采取的过渡，因此在您的状态机中实现此消息将阻止多线程状态机评估，这可能会影响性能。
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