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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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  • $\begingroup$ ""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? $\endgroup$
    – Georg
    Commented Aug 8, 2011 at 16:54
  • $\begingroup$ 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. $\endgroup$
    – gallamine
    Commented Aug 10, 2011 at 13:53
  • $\begingroup$ Why not just spray another coat? $\endgroup$
    – ptomato
    Commented Sep 25, 2012 at 17:08

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