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I read the paper some time ago, so I'm not too familiar, but it seems like you answered your own question. If an object is textureless, then its interior provides no useful information (except for maybe color). For that reason, the silhouette is the very thing that allows such an object to be identified at all (that and the fact that it is textureless). A textureless object will have no interior gradients of value, so why measure them?

I read the paper some time ago, so I'm not too familiar, but it seems like you answered your own question. If an object is textureless, then its interior provides no useful information (except for maybe color). For that reason, the silhouette is the very thing that allows such an object to be identified at all (that and the fact that it is textureless). A textureless object will have no interior gradients of value, so why measure compute them?