When I say empty actors, I mean actors that just have a transform. No components, no geometry.
Those are intermediary nodes in your hierarchy. They serve as joints or a place to attach a sub hierarchy to. (cf. Group_8 or Group_21 in your screenshot).
Gotcha… I think-- thank you
Forgive my dumbassery but are these groups imported form datasmith empty actors-- I imported it as a single mesh but it seems to generate loads of other random stuff…
Did you compare that to your hierarchy in Sketchup?
Datasmith should be trying to preserve your Sketchup hierarchy.
If you select some of those nodes and look in the details panel you will see if they have some interesting components. Especially the “leaves” nodes.
There is a function in dataprep to remove all branches where nodes do not have component but I doubt it will do anything in your case as I am expecting the leaves to have components.