Computer Science 215
                               Quiz C      Name ______________________

1. The diffuse intensity the light reflected by an object at the
   hitpoint is a product of the emissivity of the light, the
   diffuse reflectivity of the object and the dot product of

   a. unit vectors pointing           b. a unit normal at the object
      in the direction of the            hitpoint and a unit vector
      light and the direction            in the direction of the viewpt
      of the viewpt from the hit

   c. a unit normal at the object     d. unit vectors pointing from the
      hitpoint and a unit vector         light to the object and the
      in the direction of the light      light to the viewpoint

2. (a continuation of 1) divided by:

   a. the distance from the light     b. the distance from the light to
      to the viewpt                      the hitpoint

   c. the distance from the hitpoint
      to the object

3. If the dot product in #1 is negative it means that

   a. the hit object occludes itself  b. the hit object is occluded by
      from the light                     another object

   c. the center of the light is
      visible from the object.

4. What is the result when the matrix and vector shown below are
   multiplied:

 |  1  0  -1 | |2|
 |  1 -1   1 | |1|
 |  1 -1  -1 | |2|

5. If am creating a function to process an array having 3 rows and 4
   colums, circle ALL off the following prototypes that will generate
   a compiler error if I try to access t[1][1] in the code.

   a. int fun(int t[][])                b. int fun(int t[3][])

   c. int fun(int t[][4])               d. int fun(int t[3][4])