Computer Science 102
                                 Short Program 3
                              Due 9 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/sp3 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,
model.c, material.c and vector.h from previous work.

For this assignment you will write components of three new modules
and six functions.

   MODULE            COMPONENT
   -------          -----------
   object.c         object_init(),   object_dump()
   plane.c          plane_init(),    plane_dump()
   sphere.c         sphere_init(),   sphere_dump()

You will need to add calls to plane_init() and sphere_init()
to your model.c module.

A skeleton for the plane_init() function is on page 63 of the
notes. You don't need to provide "hits" functions here so you
can safely ignore (for now) the instruction to do so. The full
code for object_init() has been provided free-of-charge on page
64 of the notes. The structure of the dumpers is described on
the next page.

For attribute parsing you may either continue to write
entity-type specific parsers or you are free to use the
generalized parser described in the notes.


Your program must build correctly when you enter the command

make

Sample input, output, and the main program are found in the
directory sp3.