I'm not entirely sure whether this works with the ModTool, but I read about this over on Crymod Forums.
I thought it was an interesting plug-in that this community might be interested in due to the lack in variety of stock tree models.

http://www.xsibase.com/forum/index.php? ... adid=31101

Looks sweet! I'd imagine it'd work with mod tool, too, seeing that it has a free version, and if you won't pay for this, why pay for a modeling program *will test soon*
EDIT: Nvm, looks like it won't work with Mod Tool, unless Mod Tool is XSI 6.02
EDIT 2: Nvm, it does work with Mod Tool, but it doesn't show up like the Pandemic one does when you click file. You have to choose the plug-in explorer, click user list (or summin like that) and then T-gen should be there, so click on T-Gen>Toolbars. It's a little confusing to me so far, though... Maybe I should read its docs and tuts...

wow this is really neat. idk how to make my own, im still learning but the preset ones are all over 100k tris so no hope of being in bf2

obiboba3po wrote:wow this is really neat. idk how to make my own, im still learning but the preset ones are all over 100k tris so no hope of being in bf2

Well, you CAN use one of the tools meant to lower poly counts drastically.