The Refraction Filter Render Element is an image that stores refraction information calculated from the materials' refraction values in the scene. Materials with no refraction values appear as black, while refractive materials appear as white (maximum refraction) or gray (lesser amounts of refraction). If any hue (color) is specified in the material's Refractive Color parameter, that hue and value will be represented here in the Refraction Filter as well as being affected by the refraction's Amount parameter.
In comparison, the Raw Refraction Render Element is a color render element that takes materials and their colors into account when rendering refraction. Multiplying these two render elements together produces the Refraction Render Element.
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To properly calculate the Refraction Filter 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.
UI Path: ||V-Ray|| > Render Elements > Refraction Filter
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Enable Deep Output – Specifies whether to include this render element in deep images.
Color Mapping – Applies the color mapping options specified in theColor mapping rollout of the V-Ray tab in the Render Settings window to this render element. This option is enabled by default.
Consider for AaAnti-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.
