'BoxGeometry': () = {
When rendering cubes, each face is dedicated 4 vertices for the four edges of the square of that face. That gives a total of 24 vertices. We set the positions of a cube and its vertex length with the variables faces, in the form of a 24-by-3 array, and vcnt，更多细节参见新收录的资料
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if node.children.len() == 0 {。关于这个话题，新收录的资料提供了深入分析
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