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Examples
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Multi Matte Modes
The Multi Matte Render Element is useful for isolating geometry or material in a scene. While Object mask and Material mask render elements perform similar tasks, Multi Matte is often quicker to use in compositing software because it can be made to include only pure red, green, or 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. The following example shows the two Multi Matte modes.
In Object ID mode, we set the R (red) to match the bins, G (green) to match the benches, and B (blue) to match the trees.
In Material ID mode, we set the R (red) to match the wood panels material, G (green) to match the metal frame, and B (blue) to match the concrete.
Thus, masks are created in compositing to modify the isolated geometries or materials.
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Multi Matte Usage
In this example, we set the R (red) to match the wood panels' material ID, the G (green) to match the metal frame's material ID, and the B (blue) to match the concrete's material ID. Thus, masks are created in compositing to modify the isolated surfaces in the scene. See the render before and after compositing.
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