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student    : nataraja
graded by  : Damian Isla
problem set: ivscan
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Renders 1st test (triangle)   (0-3): 2
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): 13
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notes:

Good job. You just had two problems:

1) You were not correctly interpolating intializaing the EdgeRec, in
   that you were not correctly adjusting the starting value of X to
   account for the starting point of the edge being
   off-pixel-center. i.e. the initial value of xcurr does NOT equal
   xstart, but rather xstart + epsilon (finding epsilon is the trick).

2) 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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