Unless, looking more closely, you're just adding the night texture on top, which seems to be the case as I can see white dots on the day side pic.
You got me there :) But the final demo should have citylights ONLY on non-lit areas, I have few ideas how to achieve that, but don't know yet if they work like I think they would.
It's surprising how much can be achieved with clever textures and use of blend modes.
Yup. You just have to think slightly outside the box and see the trouble and perspiration to achieve it. Ppl are way too lazy, most cry "gimme shaders" the minute they need something like CreateCoolWater() command... yet the recent competition showed that you can have nice water even with Blitz3D tech-level. And if those ppl crying after the shaders would actually get them, they would be just looking at another BIG problem because writing shaders is one of the most complicated things you can do in 3D-world... and because of my work background and experience I do know just how difficult they really can be.