maybe someone has already posted this
a friend just showed me a super neat tool its a 3d ivy generator you just import an obj double click where it supposed to start growing you watch it grow and you export a new obj of your 3d ivy
its main purpose is clearly off line rendering but the ivy generated is lowpoly enough that it could find real time use in next gen custom map ( i am looking at you unreal tournament 3
)
http://graphics.uni-konstanz.de/~luft/ivy_generator/
i was planing on making a laputa ish ut3 map when it comes out thats basically a castle with a giant tree routing through everything
hand modeling those millions of roots would have been a night mare but i am pretty sure i can use this tool to do the work for me with some meddling and trickery (for example right now its 3 materials = 3 batches but i am sure i can do some automated stuff and a clever custom texture to make this be one batch per object they don't really need collision either)
also worth mentioning: this thing is free even for commercial use
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I was thinking it might be good for making detail around environment props, which can then be baked down to lower detail geometry and textures.
Thank you for posting.