Need Help shading a cube/flat surfaces

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Old 06 June 2013   #1
Question Need Help shading a cube/flat surfaces

Hello everyone!

It's me trying to learn about shading (it's my bane, even more than perspective !)

I am having trouble understanding how to shade cubes. I know each side represents a value:
http://i276.photobucket.com/albums/...zps20f43713.png


But I am having trouble understanding the gradation of each plane of the side of the cube relative to a light source.

For example this image looks "right" but seems to be contradicting the light source:

http://i276.photobucket.com/albums/...zpsb2969d89.png

it seems that the light is hitting directly the top vertex and logic would tell me that each side (left and right) would be lit from the top and darker from the bottom

You can see what I mean with my confusion here:
http://i276.photobucket.com/albums/...zps511b8365.png

Shouldn't all the corners touching the green dot be either "light" or "dark"?

I would love some help undersating this concept of shading flat surfaces. Becuase I am super confused.

Thanks!
 
Old 06 June 2013   #2
Reversed Vertex normals?
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Old 06 June 2013   #3
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