Nothing substantially has changed to the core itself, no. It would have been possible to create a similar look in the past, though it would have required a lot of tweaking to the profile; and then do it all again for each and every single track. And in theory you would have had to do it all again if you changed the race date in the track's GDB (there is no option to change date right now). Automation will always adapt
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Transitions from sun to moon 'light' are always going to be tricky. If anything, further tweaking to Automation should make it possible to reduce the back/forth a bit, but I'm not sure there is a simple and definitive fix. Tweaking it for overcast/rain should be easier, but will require time and fine-tuning.
Clouds were not touched. It's just a (positive) side-effect
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Transitions from sun to moon 'light' are always going to be tricky. If anything, further tweaking to Automation should make it possible to reduce the back/forth a bit, but I'm not sure there is a simple and definitive fix. Tweaking it for overcast/rain should be easier, but will require time and fine-tuning.
Clouds were not touched. It's just a (positive) side-effect