Bonjour

I am a new IPAD user and i have used a free application called TreeSketch from this site

http://www.algorithmicbotany.org/virtual_laboratory/

from The University of Calgary (you can have it at Apple store for free)

The outputs are very nice and realistic  trees that you can export wtih obj format, materials included

I have imported them in Vue infinite and ,with minor ajustment in marerial editor, you have somme additional trees in your collection

I have used the Ipad version because it have many controls visually intuitive .See the video tutorials at the botton of the link 

There also Pc version but the interface seems more and more complicated to me and not as intuitive as Ios version.I have tried it and delete  from my Pc .The Ios one is very nice