This page provides information on the Render ID Render Element which renders individual objects with different colors based on their internally assigned node handles.
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UI Path: ||Toolbar|| > V-Ray Menu icon > Render > VRayRenderElement > Type: Render ID
The Render ID render element has no controllable properties.
A common usage of this is to use the colors produced in the Render ID render element to create a mask or alpha channel in post production that covers everything with that Color. Another use is when you have a scene with many similar looking parts with similar shading and have the Render ID above this, desaturated of all color and set to an Overlay mode with a low opacity to add variation. A variation on this is to use the resulting desaturated Render ID render element as a luminance mask to then control color correction, etc.
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