whilst there may be some minor differences in how non-zero ambient and translucent channels
display on a posersurface, IMVHO translucence is a volumetric effect that cannot be properly
displayed by a zero-thickness posersurface.  they've already enabled volumetric fx for a zone
bounded by a background plane, hence it should be easy for them to enable volumetric fx for
a zone bounded by both foreground and background planes in the case of transmitted
translucence (frosted glass, edge-viewed skin) or a zone of finite thickness introduced as a
temporary calculational aid in the case of reflected translucence (skin viewed between its normal
and its edge).