Computer Science 102
                                  Short Program 4
                               Due 12 March 11:59PM

For this program the ONLY authorized source of assistance is
Dr. Westall or the TA's. ANY OTHER DISCUSSION of the program no matter how "high
level" or "peripheral" (e.g. Have you started/finished it yet?)
is STRICTLY FORBIDDEN.  Any student who observes improper behavior
is encouraged to report it to Dr. Westall. Reports that can be
verified will be rewarded with a 20 point bonus on the assignment for
the student doing the reporting and an F for the course for the
student being reported!!

Adhere to the following programming standards.  Violations will
lead to deductions.

(1) no function should be longer than 30 lines code + whitespace.
(2) the maximum nesting level in any function is ONE
(3) code lines should not extend beyond column 72
(4) no more that one statement may be written on a single line
(5) use reasonably descriptive names for variables and functions
(6) package all functions into a single source code module named camera.c
(7) your program should compile without any warnings with gcc -Wall
(8) indenting should be consistent with logical nesting
(9) diagnostic / debug prints should be disabled/deleted in
    your submission.

In this assignment you will convert mp1 to a hybrid C/C++ program.
The class definitions that you MUST use are in ray.h in the sp4
subdirectory.  If you are loafing along in the course I strongly
encourage you to CONVERT YOUR OWN EXISTING CODE.

But if you are struggling along, you might find this assignment
to be as "catabolic food" is to a dieter because the sp4 directory
also contains a fully functional C++ raytracer that will do planes
but not spheres. Only the module sphere.cpp is missing.

So if you want to make a fresh start with some reasonably robust
code feel free to do that too.  ALL the remaining projects will
build upon the C++ foundation.  In that case ALL that you need
to do is:

(1) add your vector.h to the collection
(2) following plane.cpp  create sphere.cpp

We will discuss the new object structure in class tomorrow.