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The Sheen Reflection Render Element stores reflection information calculated from the materials'  reflection values reflection values in the scene.  Surfaces Surfaces with no reflection values set in their materials will contain no information in the render pass and will , therefore, render as black.

The Sheen Reflection Render Element is formed by multiplying the Raw the Raw Sheen Reflection Render Element by Element by the Sheen Filter Render Element . So, while the raw sheen reflection pass gives the full reflection of objects reflecting in the scene, the sheen reflection filter sets sets how much of of that reflection should come through in the composite. The two are multiplied together to create the Sheen Reflection pass, which gives a true representation of the reflection in the scene. 

UI Path: ||V-Ray|| > Render Elements > Sheen Reflection

How to add a render element to a scene

Color Mapping – Applies the color mapping options specified in the Color mappingMapping 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.

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