Want to talk about modding the game or got a question about it that isn't Body Shop or Object Creation related? Post here. All other types should go to the respective sections.
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Look, I thought you meant to mod the lighting.txt for a similar effect.
What chris997 did is to simply make a huge object to occupy the whole lot and then the sky is actually the internal side of the object. So, the texture was mapped internally. The lot and sims and else are graphically inside that object.
Look at the lighting.txt file, you should find "lightingState morning" line followed by several settings.
This is a block which ending by "end" line so between these 2 lines, look for the "environment" parameter.
"environment (R G B) X?" parameter use a decimal Red/Green/Blue values between 0 and 1.
For example : "environment (0.85, 0.65, 0.4) 0.8"
Modify the Evening, look at the "lightingState evening" block.
It's because my settings are applied during Day-Night transition (Evening : 6-7 pm) and during Night-Day transition (Morning : 6-7 am).
So you should copy these parameter lines from the lightingState morning or lightingState evening sections and put them inside the lightingState daytime and lightingState night sections if you want to use it during day and night.
Remember to do a backup before change this file.
Even if you've got EP/SP, you must only edit lighting.txt from the base game.
I don't know if the cloudy weather from EP5 Seasons keep this settings.
If it doesn't, just look at the lighting.txt from EP5 and edit it.