This page gives some basic details about the Raw Refraction Filter Render Element and how it is used in compositing.
The Raw Refraction Filter Render Element is similar to the Refraction Filter Render Element, except it is not affected by the reflection weight. The result is a solid mask showing the pure refraction color as set in the V-Ray Material's settings.
||Shading viewport|| > Shader Tree > Add Layer button > V-Ray Render Elements > V-Ray Additional Outputs > Raw Refraction Filter
This render element is enabled and controlled through the V-Ray Additional Outputs properties.
Enable Raw Refraction Filter – Enables the Render Element.
Name – Sets a custom name for the Raw Refraction Filter Render Element.
Deep Output – Specifies whether to include this Render Element in deep images.
Denoise – Denoises the render element.