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student    : jpearce
graded by  : Kari Anne Kjolaas
problem set: ivscan
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Renders 1st test (triangle)   (0-3): 2
Renders 2nd test (rgb)        (0-2): 1
Renders 3rd test (cube)       (0-2): 2
Renders 4th test (interpen)   (0-2): 1
Renders 5th test (ellipse)    (0-2): 2
Renders 6th test (geekball)   (0-2): 2
Exactitude                    (0-2): 1
total                        (0-15): 11
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notes:
The pixel-lighting rule presented in lecture 
(in which a pixel is lit only if its center 
falls within the polygon) was not obeyed.

For each pixel that you light up, you want 
to take the values of color and depth at 
the CENTER of the pixel you're considering. 
So, if the starting X of an edge does not
happen to be at the center of a pixel, 
you need to adjust the starting values of 
h and color to find their correctly 
interpolated values at the center of the 
first pixel.

Linearly interpolating Z in screen space is 
wrong. You needed to instead use linearly 
interpolated values of h in order to correcly
gauge depth.
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