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student    : ctalbott
graded by  : Damian Isla
time       : Sat Nov 20 17:23:47 EST 1999
problem set: ivray
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-1 PT: NO EXECUTABLE TURNED IN
Eye ray generation            (0-2): 2
Cone, cyl, poly isection      (0-2): 1.5
Shadow                        (0-1): 1
Reflection                    (0-2): 2
Transmission                  (0-2): 2
Shading			      (0-2): 2
Supersampling and jittering   (0-2): 2
Statistics		      (0-1): 1
Exactitude                    (0-1): 1
total                        (0-15): 13.5
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notes:

Good job on a very tought problem set! I just found a few small
"issues":

Cone intersection is not correct. The quadratic you set up should be:

a = DxDx + DzDz - DyDy r^2/h^2
b = 2 (RxDx + RzDz - RyDy r^2/h^2) + Dyr^2/h
c = RxRx + RzRz - RyRy r^2/h^2 + Ry r^2/h - r^2/4

ReflectionRadiance is very close but not quite right. You should be
scaling the radiance return by the Trace by obj->Specular (actually a
component-wise multiply) rather than just ks. ks is just an indication
of how the weight of the ray should change. However, since this was
really not that clear in the comments, no points were taken off for
it.

For shadowing, note that you do not need to separate infinite lights
and other lights into separate cases (you were not marked down for
this.)



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