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student    : mattlee
graded by  : Kari Anne Hoier Kjolaas
time       : Sat Nov 13 14:57:03 EST 1999
problem set: ivray
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Eye ray generation            (0-2): 2
Cone, cyl, poly isection      (0-2): 2
Shadow                        (0-1): 1
Reflection                    (0-2): 2
Transmission                  (0-2): 2
Shading			      (0-2): 1
Supersampling and jittering   (0-2): 0
Statistics		      (0-1): 0 
Exactitude                    (0-1): 1
total                        (0-15): 11
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notes:

Overall good job, but you missed a few 
things.

You forget to multiply the reflective radiance
by the object's ks before passing it on.

You cast shadow rays even if the light is 
not visible.  This is inefficient, but not
incorrect and you did not lose any points
for it.

I don't understand how you calculate your
specular radiance.  I can't make the formula
make sence.  For one thing, you multiply
by 100.  The color space is 0-256, so you
should multiply by 256 to get the right
scale.  I can't make the rest of the 
formula work out to the right result either.

You do not normalize your reflective ray.
This is ok, as long as you are consistent,
but can lead to hard to find bugs.

Your Phong distance attenuation is not 
calculated correctly.

I can't find your code for jittering/
supersampling?  Did you write this?


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