Yup, wetness is increased Reflectivity and Metallicity, with reduced Diffusion. And, yes to have it react that way in only certain areas you would need to mask it off, which I wouldn't want to tackle that with a DTE mat, I myself would go the image map route.

A truly large part of making something look wet is also just tricking the eye. If it is near water, and if there is maybe some sea spray in the air....the eye/mind will make up the rest.

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