My map shows a streets (I have a very large map) in daylight At the end of one of streets there A large field with a cave.
in the cave has a lot of light and i want to be in a dark cave.
How to do it?

As far as I know you can only change the ambience in lua for this. The problem is if you can see out of your cave it will appear dark outside as well, until you walk out and swap the ambience back to the outside brightness. You could possibly have a gradual lowering of the light as you move further into the cave, using the distance from your switch zone or object, which would at least lessen the outside looking too dark. The best bet for something like this is to design it so you can lower the darkness gradually as you move into the cave and away from the entrance, perhaps using several sections to lower it up or down as you pass by rather than one at the entrance.

There is a darkzone.lua you can use with a trigger zone, then lightzone.lua to return to normal when you leave the cave

Yes, but it suffers from the effect I mention Everywhere will become dark.

For situations like this we could do with a compliment to the 'invisible wall' entity, instead though the wall would be plain white with and _I map to make it glow. Place the 'bright wall' (or whatever it gets called) outside the cave with it initially hidden, then when you enter the cave a certain depth unhide it,, from that point on as you continue into the cave reduce the light level.

If you turn around and look outside it will still appear bright.

For a really professional looking result you would capture the view outside the cave and use that for the _D texture on the wall and tweak the _I map to match as close as possible the light conditions outside, that way when the wall is hidden as you leave the cave the effect is less jarring.

I saw the darkzone.lua and lightzone.lua and from what I understand this is a simple code so I will change it to what I need.
Thanks everyone!!!

Im working on a system like that , that will allow this , only drawback is it will not work on terrain so your cave need to have a floor

You will be able to set any amount of light you want.

From outside, see how dark it is inside:


Indoor looking out:


Will work directly in the editor so WYSIWYG.


This will not make it into 1.14. but ....

That's superb Preben!

Cheers.