在该接触点的碰撞体之间的距离。
物理引擎跟踪所有可能互相穿透的碰撞体之间的距离,对于给定的一对碰撞体,当该距离小于二者的接触偏移总和时,将立即生成接触并发送 OnCollisionEnter 事件。这意味着尽管该接触对仍处于活动状态,但当这些碰撞体仍为分开、接触或重叠时,它们之间的距离分别可大于零、等于零,甚至小于零。
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