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The most simple example of one material having two very different BSDF is a plastic.
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A plastic material created mixing a diffuse blue BSDF plus a pure mirror BSDF in a 90-10 proportion |
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In the example below, a grayscale is used in the Weight field to indicate where that "varnish" component exists and where don't.
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A gray scale texture applied to define the Weight of the shiny component
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