Computer Science 102
                               Quiz M      Name ______________________

1. Consider the ray reflection problem.  Suppose U is a vector point
   in the reverse direction of a ray that hits an object and V is the
   direction of the reflected ray.  Which of the following vectors
   points the same direction as the normal at the hit point.

   a. U - V                                 b. U + V

   c. V - U


2. The vector U + V is equal to:

   a. (U dot N) N                          b. (U dot N) U

   c. 2 (U dot N) N                        d. 2 (U dot N) U


3. There are THREE conditions under which the recursive raytracing
   stops.  One is that the reflected ray doesn't hit any object.
   What are the other two:


   a.



   b.



4. In creating specular glints a shininess exponent is used.
   Which of the following best characterizes the useful range
   of values for the shininess exponent.


   a. 0.0 to 1.0                          b. 1.0 to 10.0


   c. 50.0 to 300.0                       d. 10^8 to 10^10