A few questions

[Telltolin]

I can't figure out how to do proper transparency for my trees. http://www.miriscusltd.com/snowyplain_snowy.jpg ingame, they're black where it should be transparent, though in openzone http://www.miriscusltd.com/snowyplain_wip5.jpg they look fine.

Any idea why, and how it can be fixed?

Also, how do I make a cave? I created my terrain in openzone, and exporting it doesn't work very well. Is there any way to make a cave in openzone or am I just screwed?

And lastly, when I test my zone out in EQ, there are some weird lighting issues.
http://www.miriscusltd.com/snowyplain_wip.jpg This is the best pic I have of it, even though it is an outdated picture.