Just in case this as not been seen:

Ivy Generator:


The ivy grows from one single root following different forces: a primary growth direction (the weighted average of previous growth directions), a random influence, an adhesion force towards other objects, an up-vector imitating the phototropy of plants, and finally gravity. This simple scheme reveals that the goal was not to provide a biological simulation of growing ivy but rather a simple approach to producing complex and convincing vegetation that adapts to an existing scene. The ivy generator imports and exports obj+mtl files.

http://graphics.uni-konstanz.de/~luft/ivy_generator/

I gave this a quick try today.

It's very interesting to watch the vines grow up/around the object.

I haven't had time to really look into it yet but I find (from just playing with it) the file saved can be very large.

It does make some very good looking vines though.