The evidence:
Interior Scene (interior lights and glass removed) in Object Mode with Rendered shading (everything looks good).
Now actually rendered:
Full Scene with Interior lights, glass, portals - Object mode with rendered shading:
and now that fully rendered:
What have I done wrong? What should I check to fix this? I don’t know what’s wrong…
Is there a lamp in your scene?
There should be a lamp inside the cathedral and I can’t find them in your scene, I think that’s why you see only shade inside.
The reason this was happening is because the walls, ceiling and floor were not being rendered, they were ticked off in the Outliner. The parent object was clicked on but they were all unticked within.
I keep learning this lesson the hard way, I guess.
