The Multi Matte ID Render Element isolates objects with specific Multi Matte IDs for compositing purposes.
Overview
The Multi Matte ID Render Element provides a mask for individual objects and/or materials, based on the Multi Matte IDs.
The Multi Matte ID Render Element contains no shading information at all, and only contains blocks of color that correspond to each Multi Matte ID. It uses the Multi Matte ID option available in the materials' properties.
UI Path: ||V-Ray|| > Render Elements > Multi Matte ID
Properties
Multimatte ID Render Element Set up
Here's the workflow for setting up and using the Multi Matte ID Render Element:
Select the material and go to the Options tab. Enable Material Id and set the Multi Matte ID to the required value.
Note: each number corresponds to a different color.