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

The Reflection Render Element is formed by multiplying the Raw Reflection Render Element (VRayRawReflection) by the Reflection Filter Render Element (VRayReflectionFilter). 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 V-Ray Reflection 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. It can be used to enhance the look of reflections. See the example.

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

(How to add a render element to a scene)

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.

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.