此参数可确定遮挡剔除的查询距离。
accurateOcclusionThreshold 控制细节级别 (LOD) 变化的距离。
此参数的默认值为 -1,任何小于 0 的值都具有相同的效果。默认值会引起自动计算 LOD。
使用遮挡剔除时,世界的遮挡数据在细节级别上有所不同。在遮挡数据中,存在各种大小的区块。每个区块包含一个“单元和门户”图。在每个单元中,可见性是相同的。这意味着在单元格可以看到任何两个点。门户是单元之间的开口,决定了它们之间的可见性。
瓦片位于 k-d 树中。该树包含不同大小的区块,其中每个区块表示一个细节级别。查询小瓦片时,将以查询时间为代价获得准确的剔除结果。
在剔除期间,瓦片大小随着相对于摄像机的距离而变化。这样可以在靠近摄像机时提供更精细的细节,而在更远的距离提供更粗糙的细节。
值越高,远离摄像机的精度越高。较高的值会对性能产生负面影响。
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