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

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

The Reflection Render Element is a key component in the main Beauty Pass.

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

(How to add a render element to a scene)

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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 the Color mapping rollout of the V-Ray tab in the Render Settings window to this render element. This option is enabled by default.

Consider for Anti-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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