Computer Science 102
                                   Short Program 2
                                 Due  4 February 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.

The assns/sp2 subdirectory contains a sample main1.c along with
header files ray.h rayhdrs.h rayfuns.h and a makefile. DO NOT
MODIFY ANY OF THESE FILES!!! You will supply camera.c, list.c,
and vector.h from previous work.

You will write model.c and material.c in this assignment.

Sample input and output files are sample.txt and sample.out
Please ensure your output is at least as nicely formatted
as sample.out.  As before, ALL output MUST go to the stderr
file.

Your program must build correctly when you enter the command

make


Phase 1 of your mission here to create the model.c function that
will drive the loading of the model definition and the dumping
of the model definition. A skeleton of the required code can be
found in the notes in the area of page 45-47. For this
assignment you will need to be able to load and dump a SINGLE
ENTITY type: material

Prototypes of the functions that will live in model.c live in
rayhdrs.h.

In phase 2 you will build material.c.  For each material definition
in the input file, model_load will call the material_init()
function which will malloc() an new material_t,  parse the attributes
reading the values into the material_t structure, and then
add the material_t to the model->mats list.

After ALL of the material definitions have been loaded
the main() function will invoke model_dump() which will
invoke material_dump.  material_dump() will process each
item on the material list producing the formatted listing.