上面两行是bunny，BVH建树2s,渲染3.6s; SAH建树3s,渲染3.2s
下面两行是那个复杂的模型，BVH建树6.0s,渲染29.9s; SAH建树7.9s,渲染24.8s
都是32个buckets
想问下你们SAH建树的时候是不是只对bounding最长的边进行考虑？我只有这样才能得到上面这么短的建树时间，如果x,y,z轴都考虑，bunny的建树就得7s。。。。（ps，我看参考链接ppt的伪代码考虑了x,y,z）
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