The Coat Render channel is analogous to the Specular 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 Render Channel isolates the reflected light in the scene. This render channel is an image that stores specular reflection (highlight) information calculated from the material's reflection value in the scene. Specular reflection is defined as the reflection of light from a surface in a single particular reflection, as opposed to a diffuse reflection which is reflected at many angles.

The brighter the area, the more highlighted reflection the object exhibits in the render. Specular highlights are colored if the Reflection Color parameter of a material is colored.

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

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.