指定一个阈值，渐进光照贴图在使用 A-Trous 过滤器时使用此阈值来过滤光照贴图中存储的间接光。默认值为 2。值范围为 0 到 2。
较大的值会增大阈值，从而降低光照贴图的间接层中的噪点。值太大可能会导致光照贴图中的细节丢失。
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