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The Refraction Render Element stores refraction information calculated from materials – such as glass or water – that refract objects behind them in the camera's view. This means the brightness, coloration, etc., of the refractions can be adjusted without the need to re-render.

Any material in a scene that has with a value set for its Refraction parameter will generate generates refraction information that can be seen in this render channel. A surface with no refraction values set in its material(s) will contain contains no information in the render element and, therefore render , renders black.

The Refraction Render Element is a key component in the main Beauty Element and can easily be used to control the refractions in the Beauty composite.

The Refraction Render Element itself is already a composite of the  VRayRawRefraction render element V-Ray Raw Refraction Render Element multiplied by the  VRayRefractionFilter render element V-Ray Refraction Filter Render Element. When finer control over refractions is needed in the composite, add these additional two channels to the output along with the VRayRefraction render element channel V-Ray Refraction Render Element.

UI Path: ||V-Ray|| > Render Elements > Refraction

(How to add a render element to a scene)

Enable Deep Output – Specifies whether to include this render element in deep images.

Color Mapping – Applies the color mapping options specified in the Color mappingMapping rollout of the V-Ray tab in the Render Settings window to this render element. This option is enabled by default.

Consider for Anti-Aliasing – When enabled, anti-aliasing is used where possible.

Filtering –  Applies an image filter to this channel.

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.

Denoise – Enables the render element's denoising, provided the Denoiser render element is present.