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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 contain no information in the render element, and therefore will render black.

In comparison, the Refraction Filter Render Element (VRayRefractionFilter) 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  VRayRefraction Render Element (VRayRefraction).

Note: 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.

This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:

VrayVFB – When enabled, the render element appears in the V-Ray Virtual Frame Buffer.

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

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

Multiplier – Sets the overall intensity of the render element, where 1.0 is the standard multiplier.

Denoise –  Specifies whether to denoise this render element.

Raw Refraction Render Element

Original Beauty Composite

Brightened Refractions

Tinted Refractions