This render channel isolates and renders only objects in the scene to which the material selected is applied. All objects in the scene to which the material has been applied will render normally with proper lighting, reflections, and refractions, and all other objects will render black.

Similar to the Light Select Render Channel, the Material Select Render Channel enables isolating objects with a particular material in the composite.

While you may only have one material at a time specified in a single Material Select channel, you may have as many Render Select channels as needed in your scene.

UI Path: ||V-Ray Node Editor|| > World > Render Channels > Matte > V-Ray Material Select

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

Render Channel Name – Customizable name for the render channel.

Enable Deep Output – Specifies whether to include this render channel in deep images.

Color Mapping – 

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.

Material –  Click in the field to bring out a list of all available materials in the scene. Choose from the list which materials to be included in the Material List.

Materials in the Material List are included in the render channel. All other materials are rendered black in the channel.