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Game Programming Gems 8 by Adam Lake

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Chapter 1.2. Principles and Practice of Screen Space Ambient Occlusion

Dominic Filion, Blizzard Entertainment

Simulation of direct lighting in modern video games is a well-understood concept, as virtually all of real-time graphics has standardized on the Lambertian and Blinn models for simulating direct lighting. However, indirect lighting (also referred to as global illumination) is still an active area of research with a variety of approaches being explored. Moreover, although some simulation of indirect lighting is possible in real time, full simulation of all its effects in real time is very challenging, even on the latest hardware.

Global illumination is based on simulating the effects of light bouncing around a scene multiple ...

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