阈值，用于限制实时 GI 的更新。测量单位是“强度变化百分比”。
描述在更新实时光照贴图前可更改的输入光照量。当更新输入光照时，Enlighten 会持续累积自解算上次照明以来输入光的强度差。每次更新都会增加当前差异，因此随着时间的推移，它是自上次解算以来的差异总和。每次更新时，Enlighten 都会检查光强度的累积总计与先前结果相比，是否超出 updateThreshold 值（以百分比表示）指定的差值。
较低的值表示实时光照贴图的更新将更频繁，但会导致更多 CPU 负载。较高的值将导致其更新频率更低，但会导致更小 CPU 负载。
值为 0 表示即使在输入光照发生最小变化时，实时光照贴图也会更新。如果输入光照不变，则值为 0 将不会导致对光照贴图的任何更新。正值会导致仅在超过阈值时更新全局光照。这有助于节约 CPU 周期，并且只更新光照更改更频繁的场景部分，而不更新光照主要为静态的其他区域。默认值为 1%。任何正值都可以，但我们建议使用较小的值，否则您可能看到跳动的瑕疵（和不正确的光能传递）。
如果您想节约更多 CPU 周期，那么您没有理由不能超过 100%。该百分比实际上是解算发生前的最大容错。
任何负值都会关闭时间相干性，因此即使照明没有改变，在每一帧也都会对系统进行解算。
请注意，更高强度值的解算频率低于更低强度值，这是有意义的，因为我们认为低强度光源中的差异比高强度光源中的差异更大。
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