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I'm modeling light interaction/reflection from a fiberglass surface with polyurethane epoxy (that is very reflective) that has been spray painted with a matte black paint. I'm looking for some input - is it reasonable to approximate this as specular reflection from the polyurethane with a loss factor from the paint absorption? Is there a better way?

By way of context, this is a large water tank where we do experiments with underwater optical communication. I'm building a Monte Carlo-type simulation to match our experimental outputs. The wall surface reflections are giving me issues.

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""that has been spray painted with a matte black paint. I'm looking for some input - is it reasonable to approximate this as specular reflection from the polyurathane "" Are You shure that You know what "matte" and "specular" mean? –  Georg Aug 8 '11 at 16:54
    
Georg, can you clarify? The painted surface is certainly not completely matte, as the paint was only one coat and has worn down over the years. –  gallamine Aug 10 '11 at 13:53
    
Why not just spray another coat? –  ptomato Sep 25 '12 at 17:08
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