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Inverting the Fresnel effect

Hi guys,

It’s early so maybe I’m missing the obvious here! I’m using a fresnel node to play with the reflectivity of my floor by blending it with my roughness map, but naturally I need to invert the fresnel’s output so the shallow angles are the “low roughness”, but using the OneMinus node is giving me only values clearly over one, even when I clamp the fresnel’s outputs first. I’m running the latest 4.22