I want to make a node group so I can enter a F0 value instead of the IOR value for fresnel.
The purpose is to make a fresnel node group for metallic shaders, since default fresnel isn't suitable for metallics.
I've already tried curves with facing node, but I'm searching an alternative without curves since they aren't easyly/quickly modifiable (in my opinion).
I've started with a fresnel node with an IOR of 1.6, it gives me a nice curve to work on. Then I put a power math node to have a max value of 1 and adjust the curve's F0, it works like I want, but it isn't intuitive to enter a power value of 0.01 for a F0 of 97%.
Color management set to none (pure datas)
An arched mesh to apply the shader, I know that the progression of the angle related to the camera isn't linear, so the end of my curve will tend to be x compressed.
Emission shader to see the curve in the waveform tool of the compositor
With this base, let say I want a F0 = 45% (0.45 is good too), what node group must I set to have the 45% (or 0.45) value driving the power of the fresnel 1.6 IOR value?
Since it's for metallics I don't need to go under the 1.6 IOR base.
And I used the terme driving but if possible I want to avoid drivers.
It's why I need a convertion from F0 to the value that powered the fresnel curve IOR of 1.6 (or better, an IOR value of x)