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The Render ID Render Channel creates selection masks for all objects in the scene based on IDs automatically assigned by V-Ray during rendering. Each object is assigned a unique integer number, and each number is colored differently. The intended use for the Render ID channel is to quickly create masks for all objects in a scene without having to set up separate Multi Matte Render Channels. The masks can be separated by their integer values or by the color used to represent them in compositing applications. A wide variation of colors is used so no two objects have the same color in the render channel.

There is no anti-aliasing with the Render ID Render Channel; 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 Channel can be multiplied by the Render ID Render Channel 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 Channel.

UI Path: ||V-Ray Node Editor|| > World > Render Channels > Matte > V-Ray Render ID

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