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.
