Bounding Volume Hierarchy.
100 spheres. Computation time: 6086(Windows, about 5 sec).
1,000 spheres. Computation time: 18706(Windows, about 10 sec).
10,000 spheres. Computation time: 74167(Windows, about 65 sec).
Buddha. Time to run 48 sec on Saint compiled with -O3.
There is only one sample used.
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