Realtime Global Illumination
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Lightmapping works very well for static geometry, but it
cannot deal with dynamic lights (like the sun traveling across
the sky).
To support real-time global illumination, Unity uses
the Enlighten system (developed by SiliconStudio).
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It still requires a precomputation phase similar to the
lightmapping process, and it is still limited to static
objects.
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It precomputes all possible light bounces in the scene
and encodes this information for use at runtime.