ID# 231: (21/22)
----------------
  -1 Extra Credit answer. The problem can be fixed by enabling depth test, culling back faces will work for 
     the cones in this assignment but if there are other objects behind the cones they will still show and 
     cause strange effects.

ID# 322  (16/20)
----------------
  -1 Part B. wrong glFrustum parameters.
  -2 Part D. looking for rotations and translations that are equivalent to the gluLookAt, simply
             reading back the viewing matrix from OpenGL is not correct.
  -1 Part E. problem with color interpolation within the cone.

ID# 326: (21/22)
----------------
  -1 Extra Credut. identify the problem without fixing it.

ID# 869 (18/20)
---------------
  -2 Part E. errors in the cone drawing function.