The principle is this. Tutorial is for Maya, but can be adapted for any other package. http://kakes3d.wordpress.com/2010/02/15/modeling-a-tree-in-maya/
I stopped thinking "is this generation.. braindead ?".. a long long time ago.. https://games.slashdot.org/story/24/02/19/1935235/how-one-developer-earned-over-300k-from-games-made-in-30-minutes Who buys this ??? And.. you do not even need AI for this..
got bored yesterday. made an adaptation of a steampunk pocketwatch based off of this reference. http://urbandon.blogspot.com/2009/02/time-and-time-again.html