Is it possible to convert Webots prototypes (.proto http://www.cyberbotics.com/dvd/common/doc/webots/reference/section5.1.html) to Gazebo SDF? I looking for an easy option to simulate Nao in Gazebo. I am not satisfied with the performance of webots (cannot even walk without sliding). The other option is V-REP, but it also needs lots development investment. Since, currently, Gazebo is under heavy development, I am considering to make the best choice with great future income :)