見落としていたのですが，Ray Classification for Accelerated BVH TraversalのサンプルコードがGithubに上がったようです。
https://github.com/jakubhendrich/pbrt-v3/tree/frustum_shafts
見落としていたのですが，Ray Classification for Accelerated BVH TraversalのサンプルコードがGithubに上がったようです。
https://github.com/jakubhendrich/pbrt-v3/tree/frustum_shafts
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