Does anyone have any tips?
Since I can’t use the directional light (it just hits the roof and leaves the interior in the shade), and emissive materials don’t cast any shadows at all, and the spotlight shadows are really glitchy and not as nice looking as the directional light shadows, I’m a bit at a loss here…
Ambient occlusion only goes so far, and apparently no forthcoming realtime GI solution will help with this either.
Most interiors do have windows, so it’s a start to let the sun come in.
If you have enough performance available, you could build your own 1 bounce realtime GI by placing omni lights where the sun hits inside. This could be done fairly easily, because the raycast system of Unity is fairly exhaustive. I haven’t tried this before myself, but I would really like to try it sometime.
I have no windows in my interior.
But I just received this tip, which I think is along the lines of what you suggested: