I was wondering if it would be possible to import empty nodes from blender file? I have used the path blender -> collada -> urho with assetimporter, and it seems to strip away all empty nodes. If I try to add mesh with no vertex or only one vertex, it also takes that away as well.
I would like to use blender as a world editor, so adding stuff like spawning points etc. would be quite nice feature, but currently I cannot figure out a way to do so. As for using collada exporter, from my testing, it seems to be working the best for importing scenes from blender.