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我正在使用索引 BufferGeometry 进行光线追踪。这意味着我有一个唯一顶点的平面列表和面的索引缓冲区。如何为每个面的顶点添加自定义属性?据我了解,每个属性缓冲区的大小应该与位置缓冲区的大小相匹配。