Special thanks to Alec Jacobson and Thomas Åhlén! Without their help, Spine wouldn't have such cool features.
Weights are computed automatically for the first set of bones bound to a mesh. You can also apply auto weights any time by clicking
Another feature we'll most likely have coming in the future is the ability to automatically generate a mesh that deforms well. For example:
Of course you are unlikely to need as many triangles as shown here unless you are exporting images or video. Generating the mesh and computing the weights automatically removes a lot of manual labor and makes the workflow quite efficient: add your image as a mesh, bind bones to it, animate your bones. This lets you focus more on animation and less on setup.