Cyberix3D - Free Online 3D Game Maker

Hello,
You can implement a Day/Night mechanism by using a rotating light + texture alpha for the sky.
You can put two cubes, one with night texture and one with day textures, and play with the alpha according to the sun's position.
Here is an example:
www.gamemaker3d.com/player?pid=01657138





Regards,
Cyberix3D team