IOR to Reflectance by Antonio Neto
IOR to Reflectance will convert an IOR value to a Surface Reflectance Value.
For example an IOR or 1.5 equals a reflectance value of 0.04 or 4% reflectance.
This can be useful if you are working with specular reflectance maps in your shaders and only
have access to a surface's IOR Value (for example from various Internet resources such as https://refractiveindex.info)
When the Manual Input option of the node is disabled you can feed in values from other layers or nodes
that will then be converted.
When ticked, the Node will no longer act as an adjustment layer, converting values fed in from other nodes
or layers. Instead it will output the converted value from the IOR Value entered via the Slider.
The IOR Value to convert when Manual Input is enabled
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