This page provides information on the Coverage Node in V-Ray for Blender.
Overview
The Coverage Render Element holds anti-aliasing data based on the Render ID Render Element. When the Coverage Render Element is multiplied by the Render ID Render Element in compositing, it adds anti-aliasing to the Render ID channel, providing a quick object mask.
UI Path
||Node Editor|| > Add > Render Channels > Coverage
Node
