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Bent Normals

Right since the 4.17 release I’ve seen no other information on this or how to do it. So I’m asking you for help

What is a bent normal for starters?

From what I’ve seen my best guess is it’s a world space normal map, am I right? If not what is it and how If I were to bake out maps for it in Substance Painter would I go about doing it.

Next how I do I set this is up in engine and what is it?

Is it a material function, post process affect or Engine rendering function?

Please can someone enlighten me to how this done.

https://docs.unrealengine.com/latest/INT/Engine/Rendering/LightingAndShadows/BentNormalMaps/

Bent normals are storing average direction from which ambient light comes.

Thank you!