Dear everybody - I've lurked here often and now I finally surface with a question (doesn't everybody?). I am making a small addon to an existing scenery for my own amusement, I just wanted a couple of changes to bring this old scenery up-to-date without changing the original itself. I don't have the sources for it because it is someone else's scenery. This is in FS9. Anyhow, it involves making new apron areas which I've done successfully enough, layering the macadam, the surface markings etc in EOD and FSSC. The apron areas I've laid with the shadows option switched off. These apron areas also involved the removal of some buildings in the main scenery which I did by setting my addon at a higher scenery layer I finally started testing the new apron areas at dawn and dusk in the sim and I've noticed that objects in the original scenery (lighting poles and the control tower, for instance) won't cast shadows across my addon, presumably because it sits at a higher layer (?). Is there a tried and tested way to get a lower scenery to work with one of a higher priority, or do I have to put some elements of my scenery (the apron areas) with this other scenery, and setting my textures to get priority over the original scenery's ones. If they're at the same layer as the original scenery's BGLs, I'm assuming that the control tower etc will then cast shadows across them. Am I thinking along the right lines or is this idea a non-starter?