What I always find difficult to emulate is the light combined with the 
texture/transparency of the leaves. I have your technique about the 
leaves (faked translucency mapping) and also use double_illuminate. It 
is the atmospheric media which is often difficult to do. Isotropy is 
fairly straightforward, but I often prefer the use of Henyey-Greenstein 
scattering withou too extreme eccentricity.

-- 
Thomas

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