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The Multimatte Render Element creates red, green, and blue selection masks based on an object's Object ID (G-Buffer ID) or Material ID. With this render element, only three colors are possible: red, green, and blue. Compare with other matte render elements, which can include a multitude of colors to represent each material or object in a scene with a different color. With Multimatte, 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 Multimatte a popular choice for compositors.

The Multimatte Render Element includes antialiasing.

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

Note: The Object ID can be assigned to an object in 3ds Max in the Object Properties dialog's G-Buffer section. A Material ID can be assigned to a material in the 3ds Max Material Editor.

This render element is enabled through the Render Elements tab of the Render Setup window in 3ds Max and displays its parameters in a rollout at the bottom of the window:

VRayVFB –  When  – When enabled, the render element appears in the V-Ray Frame Buffer.

Deep output – Specifies whether to include this render element in deep images.

RBuf ON –  – Adds objects using the specified ID to the red channel.

RBuf ID   – Sets – Sets the ID used for the red channel.

GBuf ON   – – Adds objects using the specified ID to the green channel.

GBuf ID   –  –  Sets the ID used for the green channel.

BBuf ON –  – Adds objects using the specified ID to the blue channel.

BBuf ID   –  –  Sets the ID used for the blue channel.

IsMATID  – When  – When disabled, Multimatte considers the RBuf ID, GBuf ID, and BBuf ID values to be the Object ID (G-Buffer ID) and renders the R, G, and B channels accordingly. When enabled, these values are considered to be the Material ID.

Affect matte objects  – Sets  – Sets whether to include matte objects when generating the render element. A matte object is an object that has been assigned a Wrapper Material with the Matte surface option enabled.

Red include / exclude   – Opens a dialog for adding objects to the red channel regardless of the ID they use.

Green include / exclude –   – Opens a dialog for adding objects to the green channel regardless of the ID they use.

Blue include / exclude – exclude – Opens a dialog for adding objects to the blue channel regardless of the ID they use.