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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 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
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The Raw Refraction Render Element is useful for changing the appearance of refractive elements after rendering in a compositing or image editing application. Below are examples of possible uses.

 

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Raw Refraction Render Element

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Original Beauty Composite

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Brightened Refractions

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Tinted Refractions

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  • To properly calculate the refraction information in the Raw Refraction, the Refraction Filter, and the Raw Refraction Filter Render Elements render elements, the Refraction Render Element must also be rendered at the same time, even if it 's is not going to be used in the compositing process. Doing so enables all the refraction information to be included in the rendering calculations.

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