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This is useful for compositing purposes. For example, if you have columns in front of an object and the columns will be rendered in another pass, you can turn on matte material for the columns, and the character will be rendered with the columns “cut” from the character. The columns will still contribute to the lighting, even with Matte material turned on.

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The columns have the Matte feature enabled to produce a "cut" that reveals the columns in the background picture.
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The "cut" also appears in the Alpha channel.
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