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This page gives some basic details about the Refraction Raw Render Element and how it is used in compositing.

 

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Overview

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The Refraction Raw 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 Render Element 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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