This page gives some basic details about the Refraction Glossiness render element and how it is used in compositing.
The Refraction Glossiness Render Element stores the image's refraction glossiness as a grayscale image that represents the degree of Refraction Glossiness set for materials in the scene. White areas have the most refraction glossiness, while dark areas have little.
The amount of refraction glossiness for a material is set by its Refraction Glossiness parameter. For example, V-Ray Material has a Refraction Glossiness parameter, and Skin Material has parameters for primary and secondary refraction glossiness.
||out Network|| > V-Ray Render Elements node > V-Ray > Render Channel > Color Channel > Type > Refraction Glossiness
The parameters for this render element appear in the V-Ray RenderChannelColor render channels node.
Deep Output – When enabled, this render element is included in deep images.
Color Mapping – When enabled, the Color Mapping options in the render settings are applied to the current render channel.
Consider for Anti-Aliasing – When enabled, anti-aliasing is used where possible.
Denoise – Enables the render element's denoising, provided the Denoiser render element is present.
Derive Raw Channels – Generates data in the raw channels by combining the respective color and the filter color channels.
VFB Color Corrections – Applies the post render color adjustments made from the VFB.
This render element is not supported with V-Ray GPU rendering.