LOS Roof?

[SoloJoke]

The new lighting stuff that came out a while ago has been awesome so far. One thing I've noticed though, if you use ambient lighting to try and simulate a sun, it pierces through walls as if there isn't a roof on top, meaning the insides of buildings have shadows when they shouldn't. Is there a way to create a los roof to stop this? Or some other workaround?

[Lo Zeno]

There is a masking tool that you can use to delimit the area that you don't want to be included in the ambient light (or viceversa, to delimit the area that should have the ambient light).

There are two youtube videos you can use as reference for this:
https://www.youtube.com/watch?v=verTvYTUGyA
https://www.youtube.com/watch?v=Ze2_UJgXHps

[humby]

Next to the "Presets" drop-down on the ambient lighting tab are two buttons labeled as "Mask". Click the one with the plus symbol and draw over the area that you want to exclude from the ambient lighting.

[SoloJoke]

Hey, thanks for the answers, the mask tool was exactly what I was looking for as a tool. It acts as a 'roof' for ambient lighting.