使用此枚举指示 Unity 在您调用 Physics.Simulate 时手动执行物理模拟。
在脚本中执行物理模拟可以完全控制模拟何时运行以及模拟的持续时间。使用此模式模拟 SimulationMode.FixedUpdate 和 SimulationMode.Update，以及任何其他自定义时间间隔。
模拟的稳定性和确定性取决于 Unity 何时执行模拟。如果模拟每帧运行一次，那么它始终同步，包括 Collider 之间的接触。这意味着不需要 Rigidbody 插值。
其他资源: Physics.simulationMode.
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