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Image RemovedThe Render ID render channel creates a mask for each object in the sceneselection masks based on automatically assigned by V-Ray IDs during rendering. Each object in the scene 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 Elements. 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 will have the same color in the render element.

There is no anti-aliasing with the Render ID 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.

Render IDs are not the same as Object IDs: the render ID is automatically assigned by V-Ray during rendering only, while Object IDs are assigned by the user 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.