SSAO
https://ja.wikipedia.org/wiki/SSAO
銈广偗銉兗銉炽偣銉氥兗銈广兓銈€兂銉撱偍銉炽儓銉汇偑銈儷銉笺偢銉с兂 (Screen Space Ambient Occlusion)
鐠板閬斀銇倛銈嬪奖銈掕繎浼笺仚銈嬨儩銈广儓銈ㄣ儠銈с偗銉堛伄銇撱仺