This page provides information about the Material ID Attribute in V-Ray for Revit.
An Add Attribute button is provided for some V-Ray materials. Select additional attributes that to add up to the appearance of the material. For more information see the Add Attributes And Layers section on the How to Work with Materials page. Overview
Parameters
ID Number – Isolates objects as an R/G/B mask in the MultiMatte Material render elements.
ID Color – Specifies a color to represent this material in the Material ID VFB render element.
Each material is assigned with an automatically generated ID Color.
