What does prune mean?  I suppose you ment that with the group editor I remove 70k polys, thats about cutting off a good portions of vineblades .

I couldn't find the customGeom strip feature in poser. I looked at the export dialog, the save dialog
and in the manuals.

Here is an image with the grapevine planes with shadows made in photoshop

http://atko.dk/Picture6.png

Thanks for trying to help