Ah, I needed to double click the area to start the ivy growing!
This is one fantastic program. Thanks for the link :)

Edit: Here is a quick one I did in Blender:
Modeled the arch in MoI.

Is that only one root in the image above?
If not how do make it ?

My little try (here just a simple collage of the initial object)
I have taken a simple cube from Moi :D (only triangles ! ), import in "Ivy"
Double click elsewhere one time on the cube ,
click on "grow"
when satisfy click on "grow" for stop the process,
and click on "birth" for create the object - export it
et voila :)

I just saw in Maxwell forum that a guy contacted the developer and he said he wants to go on with this software and improve it. So in Maxwell forum they already started an "Ivy generator wish list"
I guess there will be news soon.

Some precisions :)
Left Button = Move
Right Button = Zoom
Shift + Left = Rotate
And you must click (or not) for flip "normal" for see the "little green square start root" when you "double click" the button "Grow"
Import object must be "dark grey"
Click again "Grow" for start the process
Click again "Grow" for stop the process (seems you can't have 2 roots in the same time) :wondering

Click "Birth" for create the object
Click "save" for save it

As a leaf = 2 triangles, a brunch segment= 6 triangles it's normal that you obtain big file
Here 800 000 facets
default regulates
35 second create
100 mega (yes) but today machine have 2 gigas memories (Zbrush manage easily 10 000 000 polys)
Render in Anim8Or 25 second (800 * 600 with scanline)
Seems not very long for a an old machine of 3 years old :)

But tell me if you can load "alpha" in the Ivy prog?
me I can't, I must put "Alpha" outside on the resulting object (in Anim8Or for example)

AAAAAHHHHH ! I have the explanation ! Graphic video card must be not too old for see textures in IVY!

A cone+ sphere from Moi (but now not visible -->close up :) and Ivy prog :)

Hi Pilou - that seems like an awful lot of Ivy in there. Time to call in some professional gardeners ! :)

- Michael