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This page gives some basic details about the Refraction Glossiness render element and how it is used in compositing.


The Refraction Glossiness Render Element stores the image's refraction glossiness as a grayscale image that represents the degree of Refraction Glossiness set for materials in the scene. White areas have the most refraction glossiness, while dark areas have little.

The amount of refraction glossiness for a material is set by its Refraction Glossiness parameter. For example, V-Ray Material (VRayMtl) has a Refraction Glossiness parameter, and Skin Material (VRaySkinMtl) has parameters for primary and secondary refraction glossiness.

UI Path: ||Display Render Settings button|| > Render Elements tab > Refraction glossiness


To use render elements, select from the Available render elements column and click the Add button to add the passes you wish to generate at render time. When you render the scene, the added render elements listed in the column on the right, will also render, which can be viewed from the VFB window's channel drop-down menu.

For more information on the parameters on this dialog, see the Render Elements tab page.


The parameters for this render element appear in the Attribute Editor under Extra V-Ray Attributes.

Enabled – 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.

Filename suffix – The text added to the end of the rendered file, when saved as a separate file (e.g. myrender.reflGloss.vrimg).

This render element is not supported with V-Ray GPU rendering.