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student    : delfin
graded by  : Charles Lee
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): 1
Renders 4th test (interpen)   (0-2): 1
Renders 5th test (ellipse)    (0-2): 2
Renders 6th test (geekball)   (0-2): 1
Exactitude                    (0-2): 2
total                        (0-15):12
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notes:

There were certain occasions
(e.g. sometimes when rendering the cube.iv)
where a crack would appear between two
polygons that should have been flush.

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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