Unity は Umbra ライブラリを使用してオクルージョンカリングを行います。Umbra に関する詳細情報 (ベイク処理、オクルージョンカリングデータ内のデータ構造、Umbra が実行するランタイム操作など) については、以下の記事を参照してください。
Umbra によるこの Gamasutra の記事、Next Generation Occlusion Culling by Umbra は、Umbra の仕組みについて詳しく説明しています。
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