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student    : vbunny
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): 2
Renders 5th test (ellipse)    (0-2): 2
Renders 6th test (geekball)   (0-2): 2
Exactitude                    (0-2): 2
Extra credit		      (0-2): 2
total                        (0-15): 16
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notes:

Oooh ASL!

Good job -- very daring to take on the ASL. Turned out great, though.

There were just two little problems:

1) On some occasions the edges of lines were not formed correctly --
   it was subtle, but it seemed like some spans ended a pixel before
   they should have.

2) You were not correctly intializing the EdgeRec, in that you were
   not correctly adjusting the starting value of X to account for the
   start 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). Because what you REALLY want is the
   value of X at the intersection of the edge with the next scan line. 
   Note that it is not JUST X that should be adjusted in this way, but 
   also color and depth (and inverse depth).


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