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Are normal maps Y+ or Y- ?

Just wondering if anyone can give a straight answer as to whether normals in UE4 are Y+ or Y-? As far as I've found in my searches, everyone says that the Y channel should be highlighted on the bottom but I don't know if that means Y+ or not.

Product Version: UE 4.21
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asked Jan 09 '19 at 11:37 PM in Rendering

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TorQueMoD
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It is Y-. Having only two options here, you can basically eyeball it :)

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answered Jan 10 '19 at 09:50 AM

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Deathrey
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avatar image TorQueMoD Jan 10 '19 at 09:39 PM

See, that's strange because from what everyone says online, Y+ is for Direct X and Y- is OpenGL and UE4 uses Direct X. I was almost certain it uses Y+ but as I said, I have no idea how you tell. Others claim that the Y channel should be highlighted on the bottom which sounds like that might be a description of Y-... I hate that all the info on the subject sounds so contradictory.

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