This page provides information about the Render ID Render Element in V-Ray for Cinema 4D.
Overview
There is no anti-aliasing with the Render ID Render Element; where the edge of one object meets another object, the pixel color at that spot is the color from the object that contributes most to the pixel value. The Coverage Render Element can be multiplied by the Render ID Render Element in compositing to add anti-aliasing to the Render ID.
Render IDs are not the same as Object IDs: the render ID is automatically assigned by V-Ray during rendering only, while the user assigns Object IDs and can be changed at any time. In addition, while several objects can be assigned the same Object ID, each render ID is unique to a specific scene object. To create a channel that renders object colors based on Object IDs, use the Object ID Render Element.
UI Path: ||V-Ray|| > Render Elements > Render ID
How to add a render element to a scene
Properties
Enable Deep Output – When enabled, the rendering channel is rendered in the V-Ray Virtual Frame Buffer.