I have been having the need to convert an ior to it’s schlick’s approximation lately. I started getting really annoyed with having to pull out the calculator every time, so instead, I just created a network of utility nodes in maya that does the math for me. So I enter the IOR in and IOR out and after some mathematical mumbo jumbo, it outputs the schlick’s approximation number.
This is great if you are using a render engine like Arnold and have been used to a render engine like vray or mental ray.
Here is the file. It is an .ma with a sphere that has a surface shader attached as material and the utility nodes connected to the surface shader for fast viewing.