.sdf and .world file (correct usage)
Hi,
I have been using Gazebo for about a year now and I am still very confused about .sdf and .world files. Are they the same thing? Some of the tutorials use .world file to make a world (http://gazebosim.org/tutorials/?tut=i...) and some use an .sdf file (http://gazebosim.org/tutorials?tut=bu...) and its even called my_world.sdf, very confusing.
Am I correct in saying that the old deprecated usage would we to use a .urdf to model a robot and a .world file to model the word. And now we should just be able to use a single .sdf file?
Either way it would be nice if the tutorials were consistent with the usage of these file formats, or at least explained the proper usage.
Thanks!