Micro/angle dependent Roughness & Iridescence

[pixelgrip]

@CarlG

As for trigonometric stuff, I don’t get it because I thought we were trying to affect roughness (reduce roughness at glancing angles) - we have a 0-1 range and it kinda expect a 0-1 range.

what ever works for you.as sayed,if you want a correct fresnel equation for example,you need the dot product,for a precise result.

if kesonmis is right,then layer weight is the dotproduct from normal and incoming too

What exactly does Layer Weight do (scientifically/mathematically speaking)?

I’ve found a tutorial that tells me to use a Layer Weight node. I’ve analysed the code and I still don’t understand what the value it returns means, My understanding is that the output of the Fresnel node is the proportion of light that is reflected for a given Index of Refraction, but I can’t figure out what Layer Weight is doing. Searching the net, I only find very vague information on what it does: Blender Manual: The Layer Weight node outputs a weight typically used for layering shaders …