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student    : shishir
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, Shishir! Your renderer works really well. I just found two
problems:

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

2) Good job in recognizing the subtlety of setting up the initial
   value of xcurr -- i.e. that you have to adjust the value of x (and
   depth and color etc) to be the correct value at the next
   scan-line. However, to be REALLY accurate, you have to do this same
   sort of operation again in the RenderScanLine() function when
   you're interpolating along a scan line! i.e. you can't take
   curcolor to be equal to first_Edge->curColor, but rather you have
   to find the correct interpolated value at the center of the first
   pixel you're going to light.

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