在最近剔除通道后，该球体的当前距离带索引。
注意，该值的范围为 0 至传递到 CullingGroup.SetBoundingDistances（包含）的距离数组的长度，因为该数组中的每个包围距离都是该索引的上界。
例如，给定包围距离 [10, 20, 30]，第一个带（索引 0）为距参考点 0 到 10 个单位的球体，第二个带（索引 1）为距参考点 10 到 20 个单位的球体，第三个带（索引 2）为距参考点 20 到 30 个单位的球体，隐式的第四个带（索引 3）是距参考点超过 30 个单位的球体。
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