So yeah, I'm playing with lighting and colors for various parts of the day. Right now I've only got the day and night colors; I wanted to do the sunset/sunrise colors too, but then I realized that I can't just use directional lights for everything! I built a little shelter and closed it completely off, and it looked so weird with the directional lights still showing things as if I were outside - I was in a sealed cave!
My problem right now is that I'm unsure about how to decide what blocks should be lit with "above ground" lighting, and which ones should be lit as "below ground". But that only solves the problem during the day! At night things get more complicated: If there was a light source (like a torch) illuminating an "above ground" block, then what? I'm puzzling about that right now.
I might put lighting stuff on hold and do something I can handle, like actual gameplay.
So yep, I've got hills and valleys, sea level, new textures, collision detection, and jumping/falling in. I'll let the video speak for itself.