How to block skylight in indoor environment?

please read the original post again.

no you wouldn’t, you would see bright interiors from the outside. which is what the original post and the entire discussion is about

a postprocess won’t do it because a postprocess affects the camera and everything you see. so you’ll still get bright interiors when you’re outside. again, something that has been discussed in this thread

we’re all trying to get a mid-brightness exterior ambient light with a darker interior ambient light which we all perceive as normal, I don’t see what’s so weird about it. your scene has very dark shadows which unless your game has a flashlight would be very uncomfortable (the cave entrance looked pitch black, I don’t know how anyone could navigate that in a game). or it’s possible that your monitor is badly calibrated which could be causing this big difference on opinions.
here’s a few random-googled images of games with mid-bright exterior ambient lighting and darker interiors: 1] 2] 3] 4]
and here’s an example of a darker interior looking out a window (normally the game isn’t so dark - in this screenshot the eye adaptation seems to have over-darkened everything) 1]

yep, aware of that. in my Local-IBL thread there’s a section where I basically discourage people from using it anymore and I list some alternatives, and this one is part of them :slight_smile:
it might work on some cases but it’s almost fragile trickery