The Raw Refraction Render Element is a color image that stores refraction information calculated from materials' refraction values in the scene. Surfaces with no refraction values set in their materials will contain no information in the render element and therefore will render as black.
In comparison, the Refraction Filter is a render element that indicates varying degrees of refraction in the scene through brightness values in the image. Multiplying these two render elements together produces the Refraction Render Element.
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To properly calculate the Raw Refraction Render Element, the Refraction Render Element must also be added to the list of render elements being calculated during the rendering process to properly determine all the refraction information in the scene.
UI Path: ||out Network||> V-Ray Render Elementsnode > V-Ray > Render Channel >V-Ray Color Channel (RE)> Type > Raw Refraction
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The parameters for this render element appear in the V-Ray RenderChannelColor render channels node.
Deep Output – Specifies whether to include this render element in deep images.
Color Mapping – When enabled, the Color Mapping options in the render settings will be are applied to the current render channel.
Consider For AA– When enabled, anti-aliasing will be is used where possible.
