The Coat Filter Render Channel is analogous to the Reflection Filter Render Channel, with the main difference being that all Coat render channels can be subtracted from the main back-to-beauty composite, graded, and added back in.

The Coat Filter Render channel stores reflection information calculated from the materials' reflection values in the scene. Surfaces with no reflection values set in their material(s) contain no information in the render pass and, therefore, render as black.

While the Raw Coat Reflection Render channel gives the full reflection of objects reflecting in the scene, the Coat Filter render channel shows how much of that reflection should come through in the composite. In other words, the filter defines the strength of the reflection, while the raw image defines what is being reflected in the image. When these two channels are multiplied, the true level of reflection is given and produces the Coat render channel. Using these component parts of the reflection, you can better fine-tune the reflection in your final composite.

UI Path: ||V-Ray Node Editor|| > World > Render Channels > Advanced > V-Ray Coat Filter

See the Render Channels page to find out where you can find these properties.

Channel Name – Customizable name for the render channel.

Enable Deep Output – Specifies whether to include this render channel 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 channel. 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 channel's denoising, provided the Denoiser is enabled.