12-10-2014, 06:17 PM
(This post was last modified: 12-10-2014, 06:17 PM by TheShyGuy.
Edit Reason: images taken out of spoiler since its not working...
)
The shading doesn't follow the surface of the ball. With directional lighting (like sun-light), you can shade according to just the normals of the surface. If you don't know what I mean by normals, checkout the images in the spoiler. The more the normal is in direction towards the sunlight, the more lit it is. Likewise, the more the surface normal faces away from the sunlight, the darker it is.