hi there,
here are the settings for the plantmaterial i used in ,red Diningroom" Rendering (here in gallery):
the “invisible material” is this one:
(it’s neccessary that you check 2-sided!)
and here are the bitmaps i used:
http://www.sightless.de/\_kunden/red\_diningroom/plantshader2.jpg
i hope i’ve helped some people here.
