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The top of my mesh from SB:
Top of my mesh from Blender:
Looking closely, it looks like there is a misalignment... Substance painter has DirectX normal maps and OpenGL normal maps. When I use the latter, it works just fine, so I'm guessing this has something to do with directX and Evee. Perhaps there is a switch I should be turning on?
Top of my mesh in blender after exporting OpenGL normal maps
OpenGL uses Y+ for it's normal calculations (first pixel at bottom going "up") whereas DirectX uses Y- (first pixel at top going "down"). Here is the method for DirectX to OpenGL conversion for normal maps that "flips" them to the correct orientation (if it helps):
NOTE - The setup above can also be also be accomplished by using an Invert Node on the Y (Green channel) instead of the Math node, however this would convert greyscale to color then back to greyscale again - the math node keeps it non-color throughout - probably not important for this project but for very large projects, this method is (very slightly) faster.
