Poser can do the surface effects quite well, and the PPro2012 fresnel-node might be an extra to that.

Unfortunaly, IMHO, Firefly lacks all proper real raytracing effects. Therefore we can't do caustics, colored shadows nor volume / thickness driven coloring. We do need LuxRender or so for that.

Have fun.

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Usually I'm wrong. But to be effective and efficient, I don't need to be correct or accurate.

visit www.aRtBeeWeb.nl (works) or Missing Manuals (tutorials & reviews) - both need an update though