层碰撞矩阵定义了哪些层可以与其他层接触，哪些层不能接触。使用此属性指定附加到此 Rigidbody 实例的所有 Collider 无法接触的其他层。
在决定哪些层可以相互接触时，层碰撞矩阵首先包含层，然后排除层。如果一个层被设置为包含和排除，则它会被排除。
注意：根据每个 Collider 实例的设置，层可以以不同的方式包含或排除。因此，对于两个 Collider 实例是否可以相互接触，可能会存在冲突的决定。要了解 Unity 如何决定这一点，请参阅 Collider.layerOverridePriority。
其他资源：Collider.includeLayers、Rigidbody.includeLayers、ArticulationBody.includeLayers、ArticulationBody.excludeLayers。
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