反射包含其他反射的次数。
定义有多少通道计算了反射。在一个给定通道中，场景会渲染到一个立方体贴图中，并将在上个通道中计算的反射应用到反射对象。
如果设置为 1，场景将被渲染一次。这意味着反射将不能反射其他反射，并且当在其他反射表面看到反射对象时，反射对象将显示为黑色。
如果设置为 2，场景将被渲染两次，并且当在其他反射表面看到反射对象时，反射对象会显示来自第一个通道的反射。
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