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With the Multi matte Render Channel, only three colors are possible: red, green, and blue. In comparison, other matte render channels can include many colors to represent each material or object in a scene with a different color. With Multi Мatte, a single R, G, or B channel can be used directly as a matte, eliminating the step of selecting the color in the compositing software. This ease of use makes Multi Мatte a popular choice for compositors.

The Multi Мatte Render Channel includes anti-aliasing.

To represent all the objects or materials in a scene with just the available red, green, and blue colors, several Multi Мatte Render Channels can be generated for a single rendering, each with different Material ID or Object ID settings.

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

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

Channel Name – Customizable name for the render channel.

Mask Type – Specifies how the mask is generated:

Separate Channels – Considers all three Red, Green, and Blue Ids.
White – Creates a mask only for the objects with the specified Id.

Id – When Mask Type is set to White, you can specify the id of the object to be masked.

Red/Green/Blue Id – When Mask Type is set to Separate Channels, these parameters set the ID used for the respective channel.

Id Source – Specifies how the Red/Green/Blue Ids are read.

Object ID – Multimatte considers the Red object ID, Green object ID, and Blue object ID values to be the Object ID and renders the R, G, and B channels accordingly.
Multimatte ID – The Red, Green, and Blue Ids are considered as the Material ID.

Enable Deep Output – Includes this render element in deep images.

Affect Matte Objects – Determines whether to include matte objects when generating the render element.

Consider For Anti-Aliasing – When enabled, anti-aliasing is used where possible.

Mode – Selects whether to include or exclude the specified objects in the list.