丢弃现有 PlayableGraph 并创建一个新实例。
当 PlayableDirector 开始播放时，它会从分配的 PlayableAsset 中创建一个 PlayableGraph。如果分配的 PlayableAsset 已更改且需要在播放时显示更改内容，请使用此方法。
RebuildGraph 会尝试维持当前播放状态。例如，如果 PlayableDirector 尚未开始播放，RebuildGraph 会构造一个新的 PlayableGraph 且不开始播放。如果 PlayableDirector 正在播放一个现有的图，RebuildGraph 将停止播放，销毁该图，为其创建一个新实例，然后恢复播放。
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