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student    : ninghai
graded by  : Damian Isla
problem set: ivscan
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Renders 1st test (triangle)   (0-3): 3
Renders 2nd test (rgb)        (0-2): 2
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): 2
total                        (0-15): 14
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notes:

Good job! Your scan line renderer works well and is
well-implemented. You have just two little problems:

Good job on adjusting the Xstart (and zstart and colstart) positions
to account for an edge starting off-pixel-center. However, you have to
do that when you're interpolating along a single scan line as well!
i.e. You have to adjust the beginning values of your z (or h) and
color to account for the start of the span being off-pixel-center.

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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