3d sphere

Light and depth

Here are some examples that showcase the use of light to create depth:
http://www.mpgh.net/forum/showthread.php?t=907966

3d byte array to 2d render
z axis depth determines brightness of red
32*32*32 =32 768 bytes
Screen render 32 by 32 width and height
create sphere fills the 3d array with a sphere shape

Spot Light diffuse lighting using dot product

I'm assuming you made the program to do that, in that case you've done a great job!