Instead of having a traditional light system in my 3D game, I was thinking of implementing something like this
>every object in the game is self lit so it's always exactly the color of the texture
>there's also a night version of the texture and the day/night cycle just fades out the day texture to replace it with the night one
However I would also like for objects to cast a single dynamic shadow (just from the sun as the sole light source) that reveals the night texture as the only form of dynamic light in the game

Before undertaking this some stuff I wondered about is
1) are there any games that do something like this already
2) is this worth the effort or should I just go for self lit day transitioning to self lit night
3) would there be a performance gain in this system over a regular dynamic light system