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Parameters
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The Multimatte Render Element is useful for isolating geometry or material in a scene. While other matte render elements perform similar tasks, Multimatte is often quicker to use in compositing software because it can be made to include only pure red, green, and blue channels to represent objects or materials in the scene. Compositing software often has a feature for easily selecting the red, green, or blue channels in an image for use as mattes.
In this example, we set the RBufID to match the ceiling's object ID, the GBufID to match the wall's object ID, and the BBufID to match the floor's object ID. Thus, masks are created in compositing to modify the isolated geometries.
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Matte created in composite by using only the blue channel
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