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Here's my pathetic attempt at a low poly pine tree:

http://www.geocities.com/blazer_darkbasic/Tree.gif
must paste this into browser

is there a better way to achive this?

Yes, get a picture of the kind of tree you want to make, and use that as a template in a modeller. Make your tree as low poly as you can unles it's a feature in your game, like if you were doing a game called "the magic faraway tree" ar something, you'd make it quite detailed but if it's just there for atmosphere it could be a flat shape that always points at the camera, or have a 3d trunk and flat leaves, and just the leaves always point at the camera. You can make the leaves on a black background and just make that transparent so you only need 2 or 3 plains textured with that, and all positioned in such a way as when you look at your tree from any drection you can see enough to keep up the illusion. That's all you need to do, create a "suspension of disbeleif", no one's gonna study your tree too carefully if there's enemies bearing down on them with guns or sporks