计算“positions”点集的 Delaunay 四面体化 - 使用与光照贴图相同的方法。
将光照探针的空间四面体化。将 outIndices 索引到 outPositions 数组中, 每四个索引对应一个四面体。在四面体化的过程中,任何重复的位置都会 移除一些公差(保留第一个元素,移除后续元素),因此 outPositions 的元素 可能会比 positions 的少。
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