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The Global Properties of a material in the Material Editor
Above all the layers in the material tree, you can see the Global Material Properties panel, that contains several parameters that affect globally the material as a whole.
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You can see a further explanation on in the Shadow channel section page.
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The Shadow feature enabled on the ground material alone (left) and on all objects (right)
Matte Material
This option turns the material into a matte material which “cuts” through the entire image and reveals the background (IBL or Physical Sky if enabled; black if no environment lighting is used).
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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