This has been annoying me no end, ever since the base game – the lighting of lot impostors is exactly opposite the actual light inside the lot, which is just wrong. Turned out that it's surprisingly simple to fix:
1. Open (Base Game) > TSData > Res > Lights > Lighting.txt
2. Find "lightingState day" (line 204 in my file), and copy the parameters below that:
3. Find "lightingState neighbourhoodImposter : neighbourhood" (line 446 in my file), and replace the parameters below with the ones from the day state.
Next time you buildmode-change and save a lot, the light in neighbourhood view will be correct. People who use lighting mods will have to change this in their lighting mod files I guess (for all I remember, the Radiance mod did *not* fix this).
I assume the critical part is in the first bracket
light sun (-2, -2, 1.5) (1, .9, .8) 1.5
-- this looks like the position of a light source as X, Y, Z (the second one I'd assume are RGB values). The original value for neighbourhoodImposter is:
light sun (1.5, 1.2, 2) (1, .94, .875) 2
which is about the opposite. Not exactly sure how much of a role light sky and light fill1 play, but I guess it can't hurt to have them match the in-lot lighting (I actually can't think of a reason to have them NOT match?), that's why I'm replacing everything.
I haven't yet checked whether or not this matches the light direction in the rest of the neighbourhood (the light that is cast on hills, deco objects etc) but the light sources all defined in the same fashion so it would be very easy to make them match.
Thank you. Just curious, but how do you know that it is the lot imposter lighting that is backwards, and not the in-lot lighting? Are there other shadow-directions that agree with one but not the other? What happens if we copy the definitions the other way, instead?
You can change the directions in any way you want, of course. Like I said, they're defined in exactly the same way for everything -- it's always an X Y Z matrix. I'm just assuming that most people would build their lots according to where the sun is *in the lot*, hence why I'm thinking of that as the "right" direction.