IOR To Metal Tints
This page documents the IOR To Metal Tints node of the Redshift renderer in Cinema 4D. It converts per-channel IOR and absorption values into the tint colors the Standard material expects — physically measured metal colors without the legacy material.
The Redshift Material offers a built-in IOR (advanced) fresnel type for reflections that allows you to enter separate IOR and absorption values for the red, green, and blue channels in order to control the color of metallic objects.
The Redshift Standard material does not have this fresnel type built-in but the IOR to Metal Tints node allows for the same functionality by outputting separate facing and edge tint colors that are then connected to a Standard material's Base Color and Reflection Color while Metalness is being used.
The scientific values to use can seem non-intuitive for conductors, but can be found at this website: http://refractiveindex.info/,
Here you can compute the IOR and k values and use them in the relevant parameters covered below.
How to use IOR to Metal Tints with a Standard Material
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Standard Material settings recommended for use with IOR to Metal Tints:
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Metalness: 1
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Base Color controlled by Facing Color
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Reflection Color controlled by Edge Tint
Metalness must be used in the Standard Material in order for reflection color to affect the edge tint only.