Yes you can export trees, but you have to plug in the alpha map manually in poser so the leafs look ok. The image shows one of the trees I purchased on C3D, exported it as obj file and imported it into Poser. It worked fine, haven't tried locked trees though.

I'm not sure if I do it the way you want to do it. You may save yourself some money and render the tree only in Vue against a black background and use the image as an alpha plane in Poser to pose the characters around. If you manage to that, you can save yourself a lot of money.

but if you decide to go with the export module, then export the trees as low poly as you can, so it is easy to handle in Poser. Import them into to poser, but do not import them back into Vue, ude the original tree there. It will be of a much better quality and render faster then the imported version, as well as demand less memory :)

EDIT: I've tried some of the locked trees I purchased and they both export fine too, no problem at all. If I try to export a locked object, I get the locked version notice and cannot export. With none of the trees I get that though and can export them, even though they're supposed to be locked ;)

Artwork and 3DToons items, create the perfect place for you toon and other figures!

http://www.renderosity.com/mod/bcs/index.php?vendor=23722

Due to the childish TOS changes, I'm not allowed to link to my other products outside of Rendo anymore :(

Food for thought.....
https://www.youtube.com/watch?v=pYZw0dfLmLk