how do I invert my normal map inside U4?

Development Rendering
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stuck here, I knew there was an option in udk to change it but cant seem to find it in U4…
Help? :slight_smile:
Thanks

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  • add a constant 3 vector with a value of 1,-1,1 - connect the constant 3 and the normal map with a multiply and the multiply with the normal
  • under the texture tab in the textur editor (double click onto the texture) you can choose “flip green channel”
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Node “FlattenNormal” → Flathness (-1)

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Actually, I just tried it and
-1 made it worse (stronger in the wrong direction).
1 made it totally flat,
2 made it flipped
3 made it Special!! :slight_smile:

(This is many coins in a pils so it was clear to see that they looked inverted before, now they look like coins with height in the level)

Thanks for the idea, It was the opposite, *because if a normal is already ‘flipped’ relative to Unreal Engines idea of UP the Flattten tool works opposite!)

so: minus 1 ‘increases’ what it already is – if is already a ‘reversed normal’ and 1+ makes it invert (have proper height).

I strongly suspect the opposite is true, if it is a ‘normal’ normal so to speak. :slight_smile: (one that is Unreal Engine compatible), then Flatten would act logically the way you describe above (ie, -1 would reverse the normal and -2 would strongly reverse it…)

I know when I make a Normal map in Photoshop I have to select ‘Invert Normals’ for it to work in Unreal (Unreal has the opposite of a lot of programs)

thanks!

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