http://vimeo.com/68195050 (http://vimeo.com/68195050)
https://itunes.apple.com/us/app/treesketch/id421230117?mt=8 (https://itunes.apple.com/us/app/treesketch/id421230117?mt=8)
TreeSketch exports 3D models to .FBX and .OBJ so they can be used by all major rendering applications.
Best of all, its free! :bigrin:
P.