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SSAO, Close Enough since 2007 | A Brief History

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Talk Intermediate

Zenteon

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Description

This YouTube video by Zenteon is a single talk surveying the history of screen-space ambient occlusion (SSAO) from its 2007 debut through modern variants.

It covers Crytek CryEngine SSAO, the hemisphere-plus-normals fix, cosine-weighted sampling, Nvidia HBAO and Alchemy-based HBAO+, Activision GTAO, and visibility bit-mask methods from a 2023 paper. It explains noise, haloing, thin-geometry heuristics, artistic contrast hacks, and how TAA enables temporal accumulation. A ReShade shader implementing several methods is mentioned for comparison.

The audience is graphics programmers and technical artists who already know depth buffers and basic post-process lighting. Comfort with screen-space sampling and rendering-equation visibility terms helps.

Access is a free YouTube upload with narration and diagrams. Related project links appear in the platform video description.

It is a compact survey of why GTAO became common and what bit-mask SSAO changes about horizon-based assumptions.