使用此枚举指示 Unity 在 MonoBehaviour.Update 之后立即执行物理模拟。
在 MonoBehaviour.Update 期间执行物理模拟会产生较不稳定、较不确定性的物理模拟，这是因为可能会出现难以预测的帧速率波动。不过，物理模拟始终在每帧中进行同步，包括 碰撞盒 之间的接触。此模式不需要 刚体 插值。
其他资源：Physics.simulationMode。
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