How to adjust Normal Map Strength in Unreal Engine

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It’s nice to have adjustment options on our normal maps. Sometimes the strength that works in another DCC doesn’t work for the final look, something I frequently encounter with the base colour channel. Typically I add a Vector 3 and Multiply nodes before the final output, but for non-colour data this doesn’t work.

Instead we need to split the RGB data out, multiply only the red and green channels and pass the blue channel through unchanged. Here are the nodes for this slightly intimidating setup:

Works a treat!

Thanks to Jaakko Saari for this tip!

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